351w compression psi I have 180-190 psi in 1-7 cylinders and 250 psi in #8. Hopefully I can go and take a look at it soon. Girdled. Oct 30, 2002 · Small Block V8 (221, 260, 289, 5. 8/351W) - Compression psi/ratio - I'm going to be doing a compression check on my 351w +. 95 compression height. A '69 351W in good shape should have around 150-170psi. 8/351W) - 289 cylinder compression - I have a freshly build 289 and was wondering if the PSI on the cylinders of 60-100 PSI is enough to cause a problem. They also said 120 was very common and I've seen 90 run very strong. 79:1? 9. Anyway, I'm glad you Mar 5, 2024 · The 351W’s compression ratio dropped from 11. Oct 14, 2005 · i have roughly 20k on motor in sig, has had nitrous pumped in for a short time in the spring of '04. 6/400, 351 Cleveland - high compression option for 351m - I was bored earlier today on summit racing and was looking for piston options for a 4 bore and between a 1. ??? - Hello, Finally got my 351w in after having it sit in my garage for a few months. Dec 19, 2009 · Compression ratio: I am going to use a lightning/351w gt40 lower, tubular 5. 7L. 351 Windor-5. Jan 6, 2017 · Small Block V8 (221, 260, 289, 5. 8/351W) - Compression ratio of a 78 351 - I am just wondering what the stock CR is for a stock 78 351 with 69cc heads- I am thinking somewhere between 8. so to answere your question Jul 3, 2008 · 351W - 357ci - 9. Jump to Latest 21 - 28 of 28 Posts. Oct 29, 2010 · 335 Series- 5. How to calculate psi from compression ratio? The following example goes over the steps required to convert a compression ratio into pounds per square inch (PSI). Like UT mentioned, consistency is more important than peak psi. Now this isn’t to say that higher compression pistons (flat tops, pistons with positive dome volume, pistons with negative deck clearance, etc. 91 Overlap at . The 351W (Windsor) made its debut in 1969; it is often confused with the Ford 351 Cleveland, a different engine of near identical displacement that also began production in 1969. An example of this would be for instance, if the highest cylinder read 140, the lowest one should be within 126. You are only gaining 7 cubic inches boring a 351 . I do'nt want to turn her loose with one of my big block trucks. That means a bore job and new pistons. 6/400, 351 Cleveland - compression psi on 351m - My manual does not say what would be an adequate psi for my 76 351 m. 8/351M, 6. 8 Ford; 429 - 460 Big Block Ford; Ford Compression Calculator. Skip to content. Any increase of RPM for 1 compression stroke means that there is a weak hole. Once we've found the 'dead' cylinder, the next step is to find out what's causing the low compression value. To your question, the PCM manual for the 351W references 170 PSI. 1/4" 120-160 Jun 7, 2006 · Hi everyone, can anyone tell me what the compression should be on a 351w in a 72 mustang? I done a compression test the other night and got readings of 120 to 130 psi not sure if thats good or bad! what was the compression when it was new? Nov 20, 2004 · The E7 on a 5L are about 9 cr and do fine with boost up to about 10 psi but a close watch on timing is required as well as using at least 93 octane gas. Others said advancing is a popular practice with the 300 c. It'd be nice to rebuild, and get some new pistons to bump the compression up to around 9. Apr 23, 2004 · The problem when you use stock 302 piston, the compression is too high for iron heads and 93 octane. Planning on a close to stock rebuild. 7:1 with 60cc heads adn a flat top piston with 4 valve reliefs. comp ratio and compression are not realted. 5 cylinders were about 115-120. 9:1 302 with a 230 @ . 8/351W) - 93 351w compression - 1993 F250 with 351w and 5speed. I recently did a compression test and have listed the results below. The price is right if it comes with most of the stuff I need. 5:1 in some cases, but they had low effective compression ratios. Regardless of whether the engine has a low compression or zero PSI compression issue, you'll see a range of symptoms that will affect performance, reliability, and drivability. Even a little boost goes a long way on a modified 351W! 351W -Engine Specifications GENERAL SPECIFICATIONS Bore and Stroke Compression Pressure psi. 9 cu in (5. 351 (2019) mechanical issue for 1/4m HTC 2018 TOTY HTC 2020 TOTM Aug 8, 2001 · 335 Series- 5. quench area is not really the same as deck clearance you also have to figure in a . Using dynamic compression ratios is the best way to "guess" at octane needed. May 20, 2008 · What should the cranking compression be? It's showing 110 psi in cylinders 1&2. In this case, the compression ratio is a simple 2:1 = 2/1 = 2. Thinking flat top's would be the right route for this. 3:1. Well here are my dismal readings in both dry test & wet test: DRY: (1)180 (2)180 (3)160 (4)150 (5)175 (6)0 yes, zero! (7)130 (8)130 Oct 12, 2013 · im on my shop computer which is slow as hell and i cant seem to find any info other than compression ratio. Im guessing that 150 might be the psi of a fresh from the factory engine and that since mine is 135 on Aug 8, 2024 · Compression Ratio to PSI Example. I was looking into these pistons Keith Black/KB Pistons KB281-STD - Keith Black KB Performance Pistons - Overview - SummitRacing. This solves all your compression problems in one step. 8 engine I am looking at purchasing to go into my truck. Around 10% is max variation generally. Additionally, the dipstick location was relocated from the timing case to the skirt under the left cylinder bank, making swapping an old 351W block into a newer model much more difficult. You are looking for anomalies. I pretty much did everything under the sun the book said to do and then some with the help of the members on this forum and my final troubleshooting Where does yours need to be? And finally, what is your engine’s compression ratio? Too much compression with nitrous causes destructive detonation where damage happens in a nanosecond. The 351. Stats for compression calculation is as Feb 15, 2004 · Does anyone know what the cylinder compression is supposed to be for a 351W ? I want the psi , not the ratio. Post the results. Aug 25, 2014 · I turned the motor over 7 times for each test, and in each cylinder pressure got between 75 and 100 psi on the first stroke, and took about 3 strokes to get most of the way up to the observed maximum. 5:1 would probably work quite well in an engine that runs 10. The 2V 351 for 1969 needed a piston with a huge dish to get the compression down to 9. 5? Mar 16, 2014 · I'd like to raise the compression a bit from the stock truck compression. 0:1 to 8. 5:1 and I plan on putting the boost up to 12 psi (once I get a bigger blower). Jun 1, 2021 · Even saying to advance while crank compression testing and set at the advance setting that gives the highest compression psi. Compression Ratio and Cam not matched or worn rings, valves. Ford Motor Company built them between 1969 and 1996. This is a good range for a street motor. Automotive Forums . 9. 6/400, 351 Cleveland - 400 compression psi? - tried the search function---got way too confused for my own good. 2:1 CR, more of my liking. Apr 13, 2014 · Compression will vary based on SCR and cam timing; Performance/race engines 170 to 230 psi or more; Stock engines ~130 to 200 psi; All cylinders withing 5% (performance) or 10% (Granny) The actual psi is less important than the cylinder-to-cylinder variation. Plenty of steam out the tail pipe always, oily color in the radiator fluid and lots of bubbling in there too even after carefully Feb 16, 2001 · 351W Compression Ratio Windsor Power 351W Compression Ratio - MustangWorks. it is a reverse rotation engine. The heads is what made the compression ratio higher as all heads are interchangeable. 039 or so thick gasket and the design of the heads. 002 in the hole. The first step in determining the psi is to determine the compression ratio. 5:1, which generally will peform quite well with 89 octane gas. Jan 26, 2020 · 1987 - 1996 F150 & Larger F-Series Trucks - what piston to get the proper compression ratio for 351W with GT40 heads. Boost in PSI or BAR Static Compression Ratio Ford 302 HO and 351W; Ford 260, 289 and 302; SBF Valve Layout; BBC Valve Layout; Wheel and Tire; 5 Lug Bolt Pattern; Any "number" above 100 lbs is fine (bet that motor will turn about 150 psi) but again, it's the consistency that is really important. If I cranked 5 revolution really slow, the results were much lower. Jun 6, 2020 · What should the compression meter be reading when doing a compression check on a 351W? I have seen referenced numbers from different sources as well as gauge readings I have used for the same check. 0:1 compression form the stats I have. The current automotive engines i know of should better be above or around 160psi. The 351 corresponds to the number of cubic inches displaced by the stoke of all 8 cylinders during normal operation. Windsor Sr. It also says that no two adjacent cylinders should have no more than 12-14 psi difference between them. Mar 20, 2011 · Compression estimate on 351W (70 heads / 79 block) Jump to Latest 8. 050 cam. 7:1. 030 over. Oct 21, 2007 · Results: All cylinders around 135 psi +/-2 psi. 6/400, 351 Cleveland - compression test for 351M - Hi all, I've asked this question in the proformance section with not much luck , I didn't know there was this section just for the M motors. I now have installed a set of 4V closed chamber heads with a 1970 casting mark. Getting each of these elements dialed in is crucial to productive performance. Is 8. 79:1 compression with 28cc dish pistons gets the following dynamic compression numbers: Static compression ratio of 9. Dec 5, 2010 · Small Block V8 (221, 260, 289, 5. 9K views 1 reply 2 participants last post by RBELL Sep 23, 2014 We run a compression test on our 351W in the 1968 Ford Fairlane 500 that we drove round trip and raced at the 2022 No Name Nationals. 1/4" 120-160 Oct 13, 2007 · Small Block V8 (221, 260, 289, 5. May 19, 2020 · This 351W will be run off a 302 computer, as it is replacing a 302. From the time the intake valve closes to TDC is the actual running compression ratioand is commonly around 7:1 on street engines. (tested with a warm engine) Feb 13, 2003 · Small Block V8 (221, 260, 289, 5. Can anyone tell me what my compression readings should be? I cant find the spec in my manual nor can i find it on fte. 8 compression ratio - Hi guys, I need a little help figuring my compression ratio. Cubic Inch Displacement: Compression Rati. You don't bore engines for big power gains, you bore them to have a clean and true cylinder to work with. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm Apr 17, 2019 · So I have an update but not much good news as far as water in the oil. it was 0. Compression distance 1. Thanks for the help. 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - 85 F250 351W Compression Test Results (advice needed) - Hello Gentlemen, I recently purchased a F250 351W 4x4 with 88,000 miles on it that was used for plowing. I have owned the Bronco for approx 1 year and have 0 power under load issues, )or ford econoline piston 5. 039 thick head gasket. This engine seems to have higher than standard compression so I guess it may have som Oct 28, 2016 · Run through an air-to-water intercooler (also from CX Racing), the twin turbo 351W produced 631 hp and 608 lb-ft of torque at a peak boost pressure of 7. 040. 2:1 static compression (meaning calculated with actual piston, chamber, bore size, etc) but I only get 165-175 cranking May 24, 2005 · Thats why I suggest a compression ratio of 9. Aug 28, 2010 · Modular V8 (4. 7:1 the stock compression ratio for a 69 351w 4v engine? Do you think those pistons are the correct ones or will I lose some performance? Sep 14, 2002 · 1978 - 1996 Big Bronco - 5. - Need some help on what piston and compression ratio I should be trying to get for my engine build. Blower boosts in the 6 psi range should allow for an increase in the 80 to 100 hp range. Aug 28, 2012 · Recheck again with all the plugs removed and holding the throttle wide open while cranking. I had a friend lend me his leak down tester where I put 100 psi into each cylinder at tdc. A lot of builders suggest running about a . it ran OK but had a miss to it. 79:1. Feb 21, 2021 · At 16-18 psi, backpressue was in the 2. Didn't check the others, but it runs pretty smoothly so I don't suspect a blown gasket or anything like that. 8L V6 cam sensor made to fit 351W and LS-1 coil packs. A good RV cam optimizes the cam timing for the low compression engine. 13 to 1 compression (estimate). 92) on a 408w, stock block in the past. It is a Factory crate engine, has approx. 5 to 1 with this set up. i. Thats where dynamic compression figures come into play. 4L) - 5. 8/351W) - What should compression be on a 5. 8L Compression??? - What compression does a 1989 351w 5. 8K views 33 replies 4 participants last post by Art Apr 9, 2011 Mar 5, 2003 · Small Block V8 (221, 260, 289, 5. Mar 8, 2004 · I recently did a compression pressure test in my auto shop class to my mustang with a 351C 2V with 48000 miles on it. Disconnect the ignition, if not already done. Another route would be to use 78--> heads which have The basics run down on a engine. Jul 9, 2005 · Cranking compression is affected by, static compression, intake valve timing, and exhaust valve closing point. 8/351W) - 1989 Bronco XLT - 5. 1:1 CR. but if atmospheric pressure is 14. I ran a compression test where all cylinders were between 135 and 145. Probably worked this a lot harder than necessary, but when I rebuilt and bored my 289 we measured 165 psi. Sep 4, 2004 · 1994 351W F-250 Compression Ratio? Jump to Latest 5. We prove that you can s Dec 23, 2007 · 335 Series- 5. I do however have a set of low milage edelbrock performer aluminum Nov 25, 2022 · 1973 - 1979 F-100 & Larger F-Series Trucks - 351M low compression - Hi, I did a compression test today on an engine that I bought to go in my truck, a 351M. It has no main walk and excellent oil pressure. 4. You then can use pistons from Tim Meyer, which are specifically designed to have a higher compression height. Gatas gold gordinha de 18 anos cavalgando na tora grande de seu namorado, a bela gorda safada estava assistindo tv com seu namorado até que ela fica com muito tesão e começa a provocar seu namorado que claro não resiste quando a safada fica sem calcinha e já coloca para a gordinha rabuda cavalgando bem ford econoline piston 5. 351W -Engine Specifications GENERAL SPECIFICATIONS Bore and Stroke Compression Pressure psi. Sep 9, 2006 · Big Block V8 - 385 Series (6. what should the compression be on a Jul 14, 2011 · Less than 115 PSI Poor low speed performance, poor throttle response, hard starting. I have a custom cam which will affect cranking compression. JQ Feb 9, 2008 · In general, I'd say 185-195 psi cranking compression is the limit. 0/302, 5. Ive been thinking of installing a remanufactured engine so I had a compression check COMPRESSION RATIO Compression ratio is defined as the ratio between the Total Volume (Cylinder Volume plus Clearance Volume) above the piston at BDC and the Clearance Volume above it at TDC. With the compression, cam, exhaust, and ignition work it should run much stronger. 145 PSI to 165 PSI Modified street motors. If you are planning to have the crank turned, it is just as easy to buy a reground 400 crank. Are the flat tops really too much for a 351W motor? Jun 1, 2010 · Can anyone hazaed a guess at what compression ratio I have ended up with? I started with a 71 351 2V from a Cougar. Nov 15, 2012 · With a stock/mild cam and 9:1 compression ratio, you'll get 140-150 psi. The block is a 351W roller block. 7:1 with 4 barrel carburetor. chambers) and im not sure if the pistons are slightly dished but they are relieved. not like a noticeable dead miss but something just wasnt right. 5-1 for a 4v engine 11-1. Normally I look for about 170 psi to 180 psi. The cylinder pressures were much lower which helped emissions, but without the pressures the power was hurting. has 700 hours on it and cylinder numbers 1 and 5 are at 130 psi and the rest of the cylinders are at 135 psi. Flat-top with 4-valve relief. I Oct 18, 2008 · Small Block V8 (221, 260, 289, 5. Jan 26, 2010 · I have a 78 f-150 2wd that she wants when she gets older and more responsable. Is that too low? The readings are all consistent and they dont leak down, but it seems a bit low. Perform the compression test with engine at normal operating temperature, spark plugs removed and throttle wide open. 0-8. I want to bring the compression ratio up a little bit using stock rods, crank, and heads. Another factor is that going over 9. 5:1 which worked out fine N Nov 28, 2002 · The 1971 Boss 351 had the highest compression ratio at 11. It was introduced in 1969, and got its name from the Windsor Canada location of the Ford assembly plant that built them. Does anyone know what the compression on this engine would have been when new? It now has 141,000 miles and seems to run good. The heads need rebuilding too. ford econoline piston 5. If I recall, I think a stock '75 302 with 8:1 CR I tested awhile back had 118psi. For this step, go to: TEST 2: Wet Engine Compression Test. 50 The lowest reading must be within 75% of the highest 40-65 1-3-7-2-6-5-4-8 Exc. 8? - Today I am very excited, I have found a complete 5. Jul 12, 2012 · I did a compression test, warmed the engine a bit, tested on dry cylinders then with a bit of oil on each piston. The readings all read between 65 and 75 psi with all the spark plugs out and the carburetor stuck open. Mar 9, 2020 · 1987 - 1996 F150 & Larger F-Series Trucks - Correct cylinder compression PSI? - Folks, for a ?93 351w, what is the correct cylinder pressure? If I remember its about 130-135, but I could be way off. alot of the early muscle cars had high static compression ratios like 11. The results I got are much lower readings around 125-130 for each cylinder. Dec 29, 2007 · 335 Series- 5. Cam plays a HUGE role in cranking pressure. Effective stroke is 2. The next highest was the 1970 351c 4v which had 11:1. Jan 2, 2008 · Small Block V8 (221, 260, 289, 5. Apr 12, 2005 · Alright, I've run through a few of those online compression ratio calculators, and for a flat top piston minus 6cc for valve reliefs, with 58cc heads and a 4. 20K miles on it. To my knolodge there was no changes between 90 to 91 so yours should be the same. No cylinder lost more than 5% over an hours time. 4 compression - I have a question. 030 bore I'm looking at around 11. conventional oils. 5-1 compression RHS200 heads and custom turbo cam Edlebrock Super Vic EFI intake with Accufab 4 brl TB AEM plug-n-play computer with VERY custom one-off DIS ignition using Explorer crank senser, modified 3. What should it be? The 351 Windsor (351w for short) is the largest of the Ford Small Block engine family. This means that cylinders #4 and #8, which have compression values of 120 PSI and 90 PSI respectively, are causing the misfire issue because they're below the minimum of 144 PSI. 230 in. Keep in mind this was a 200K mile stock bottom end 5. pcv valve is ran off the nipple on the base of the carb. One cylinder's compression is out of whack w/the others 2. Oct 12, 2003 · Small Block V8 (221, 260, 289, 5. the bad news is that all cylinders are about 120psi on an engine with a fresh rebuild and that sounds mighty low. ford engine and that it can help with driving in high altitude's thinner air. Jan 4, 2015 · 335 Series- 5. 050” Oct 18, 2017 · 1987 - 1996 F150 & Larger F-Series Trucks - 96 5. Crank at least 6 revolutions per test and keep the battery charged. 4 cc cambers Stroke 3. 5:1 compression usually requires more than flat top pistons, unless you have small chamber heads, and domes add to the cost of the engine, as well as the cost of the higher octane gas. 9:1 Too high. What would be the PSI of a 9:1 compression ratio motor? Dec 18, 2011 · I had a 2 barrell on it (stock) and it was nice and torquey. 6L, 5. Obviously the compression test was very misleading. 8/351W) - Compression, Octane, 351W - Hello all, for some context I have a 351w that I rebuilt, its got the following mods done to it: Long tube headers, custom exhaust, 21lbs injectors, a comp cam 35-255-5, and ported and polished E7TE heads. sales@dssracing. 5:1 with the 60cc head. I performed a compression test on the engine today, and thought everything was looking good until I got to #8 cylinder. This engine has a compression ratio of 8. Oct 18, 2024 · For a healthy '69 351W I'd expect to see warm engine cranking compression pressures in the 150-170 psi range, with no less than 20 psi difference between the highest and lowest readings. s. Nov 25, 2005 · "Boost" in automotive engineering is a positive manifold pressure in cars with turbochargers or superchargers. 1) does anybody know what the c/r is on a 94 5. car started with pertronix igniter and flamethower coil. ) don’t generally make more compression … with all other things equal, obviously they do. Boost is quantifiable as the pressure above atmospheric pressure that the turbocharger or supercharger is creating in the engine's inlet manifold, and is usually measured in bar or PSI (pounds per square inch). So i check the compression and all the cylinders were between 115 and 120 except for number 7. 140-145 psi on all Find FORD 5. 1969 block which is higher in nickel. Heads slightly milled. 9 mm). Forged Arias pop up pistons, forged rods, cast crank. Compression has to be thought of two ways: static and dynamic. That's with all plugs removed and throttle blocked in the "wide open" position and a fully-charged battery to maintain cranking speed. 040 here shortly. Compression Height (in. Aug 17, 2008 · Is there a formula or even a ball-park way to determine compression ratio based on the psi rating from a compression test. on it. Jul 12, 2011 · 335 Series- 5. Feb 26, 2009 · From my own experiences I have found that you will see about 5 psi less oil pressure using synthetics vs. Your dynamic compression ratio is 7. made about 360rwhp N/A with that set-up. The 4 cylinders on the drivers side all read within between 125, 120, 120, 130 psi, while the 4 cylinders on the passenger side read between 70, 80, 70, 70 psi. I rebuilt the C6 putting a shift May 12, 2009 · No, you won't notice anything from an overbore, unless the engine is in bad shape. put it back together. Higest PSI was 145 and the lowest was slightly above 120. Oil didn't seem to Jan 1, 2023 · In PART I, we detailed the construction of a long-rod, high-compression Ford 351W V-8. 8/351W) - Poor 351W compression - I bought a 1985 F150 / 351W / C6 / XCab for $300, beacuse the owner said the tranny was bad. Minimum compression is 100 psi @ 200 rpm. 8L/351 Pistons 1. Also does anyone know of a good specific forged piston I could use to reach the desired compression ratio. Been running it for wood/plowing for 5 years. 8/351W) - '85 351w Cylinder compression p. . Apr 26, 2004 · Set of 8 Sealed Power cast aluminum pistons for Ford 351W 1969-71. What type of reading are you getting? May 15, 2005 · Small Block V8 (221, 260, 289, 5. loman, tell us how you tested your cranking compression. I do however have a set of low milage edelbrock performer aluminum heads Nov 29, 2006 · I will be running the old GT-40 iron heads on my street EFI 351w build and was wondering what would be a good compression ratio for a tough daily driver? The heads have the 64cc chambers. 5 in (88. 8L Cylinder Compression Test Results - Good evening everyone, I am having a devil of a time in finding what the correct cylinder PSI range is for my full size Bronco. I have it narrowed down to either the Fel-pro 93333PT1 or the Fel-Pro 10111. Compression up means your rings aren't sealing. I'm trying to get a feel for where the engine stands in the life cycle (as shown by compression tests). Over 10 Min. litterally 0. Jan 7, 2011 · Cylinder Compression-psi -- 5. Given that you would have 16 or 17 psi when using conventional oil. My Probe pistons have 15cc reliefs and are . The other two Jul 9, 2007 · Small Block V8 (221, 260, 289, 5. 6/400, 351 Cleveland - Figuring out compression ratio on a 351C 4V - Log In; Register; Forums. 8 Stroker SBF 351W SX Series Nov 17, 2012 · 1970 351W compression for a 2v engine was listed as 9. If I cranked 10 revolutions fast, the results would jump up 135 ==> 145 ==> 150. To give an example. 8 Stroker SBF 351W K2-FX Series Jun 1, 2021 · Even saying to advance while crank compression testing and set at the advance setting that gives the highest compression psi. I've reached out to jegs tech support with the same question and they recommended Speed Pro 844-H336CP40 Sealed Power H336CP40 Speed-Pro Hypereutectic Pistons with Coated Skirt - Free Shipping on All Orders @ JEGS . 8l compression test|compression test on 351W WEB18 Anos. Im guessing that 150 might be the psi of a fresh from the factory engine and that since mine is 135 on Nov 16, 2003 · Small Block V8 (221, 260, 289, 5. 8l? - A few ?s. Jul 27, 2005 · The reason for running high compression, particularly in hi RPM engines is to compensate for the drop in actual compression, due to the shortness of time for cylinder filling. But so far Jun 29, 2005 · Compression ratio 1969 351w Jump to Latest 11K views 4 replies 4 participants last post by htwheelz67 Jul 1, 2005 Apr 16, 2012 · 1968-Present E-Series Van/Cutaway/Chassis - 351 W 1984-1991 -Exchange & carb questions - 1) What are a)compression ratios for '84 351W w/ 2 bbl. Sep 29, 2011 · Ford 351 Compression Specification A. I just wanted to warm it up, but I also know it needs a compression change for any kind of performance. The 351 Windsor engine is an 8 cylinder, 90 degree, overhead valves (OHV) engine. 1 2 Current 60' PB 1. 5:1 or 11:1 compression at extreme rpm, because of Jul 18, 2005 · '95 truck 351w Engine Specs? Jump to Latest 22K views 9 replies 6 participants last post by beaglesfalcon Jul 20, 2005 Jun 19, 2004 · 335 Series- 5. ) (5) Newly Installed Used Up to 10 Min. Well they ran a vacuum or compression check and told me my number 8 cylinder is like 70 percent off its compression. Cam lobe, duration, ect Small Block V8 (221, 260, 289, 5. ) and get Free Shipping on Orders Over $109 at Summit Racing! 393W / 5. Cylinder / Dry psi / Wet psi one / 137 / 146 two / 137 / 145 three / 117 / 120 four / 147 / 152 five / 142 / 149 six / 148 / 149 seven / 150 / 150 eight / 140 / 140 My whole RH side is a little weak. 8l compression test|compression test on 351W : import I have a 5. 7 PSI Mar 2, 2003 · effective compression is what will cause the pinging if you have too much. 0 MAF EFI upper, 93 cobra computer and 24# injectors/65mm MAF, aluminum heads probably x303 (cheapest) or edelbrock performer (not cheapest) with either an edelbrock 2281 cam or custom grind. May 13, 2007 · My compression averages around 170lbs. Hook up the weak battery. 8/351W) - Compression Readings on a 302 - Ever since I bought my truck a few months ago I have been chasing a rough idle/miss. STD 351W/302 HO Ford Cam Bearing STD 351W/302 HO Ford Lobe Separation 112. Jan 26, 2005 · The factory 4V 69 351 was rated at 10. Dynamic compression is how much the actual air fuel mixture is getting compressed. This is a budget build so KB364 (22cc dish) are not an option right now. The truck has had a few power problems come up recently. 0:1 and then run a cam like that 252H with a new timing set. Jul 19, 2004 · There specs are 100 psi is the lowest reading and some considered it dead! You want your psi to be with 80% of each other. Thanks I might be wrong,but if I remember right it should be around 150p. good news is all the compression is litterally within 3psi of eachother. The owner told me that he measured the compression two month ago and got around 120psi on each cylinder which was good with this engine. Pistons (H273CP)10 cc dish Engine 69-70 351w block Heads D0oe 60. I have no clue if that is true (that it is good). 91 and 1. There were only 3 options, and only one of them (1. Jun 14, 2011 · I'm rebuilding my 289. Also check "wet" by squirting a couple ounces of motor oil into each cylinder, repeating the compression test. If you're fully warmed up and the oil pressure doesn't increase with RPM, you're most likely looking at a rebuild as your crank bearings or internals are likely shot/worn. (Sea Level) @ Cranking Oil Pressure - Hot @ 2000 RPM Firing Order Size Drive Belt Tensions (lbs. 60:1 compression with 87-91 octane or should I opt for the 28cc pistons and bring the compression down to 9. Generally, I run a leak down test when: 1. I was expecting it to be closer to 150 psi. Feb 22, 2011 · The Chilton book I have for the 1986 F250 XLT only says that the compression should be within 80% of maximum but leaves ya hanging as to what that maximum compression number is. ) and get Free Shipping on Orders Over $109 at Summit Racing! 418W / 5. Find FORD 5. Feb 18, 2004 · My current compression is 9. This motor has about 30 hrs. 0, pushing way more power than it could survive long term. i have a breather on drivers side valve cover and pcv on passenger side cover. My 351W H. Gasoline will only compress so much before it blows up like desiel fuel, octane is this resistance to doing so. 719". 8 liter Ford engine in a 1995 Four Winns (22'). 8/351W) - '95 351W compression ratio? - I have a '95 351w sitting in my garage waiting for the weather to warm up so i can rebuild it. Jan 22, 2004 · Small Block V8 (221, 260, 289, 5. May 17, 2016 · Lower compression ratios and retarded cam timing were internal to the engine. 040 quench height for best performance. GT40 heads (F3ZE casting), stock thickness head gasket, piston is a . 0 (zero) PSI compression in some or all cylinders. Compression. Apr 5, 2010 · The only thing that concerns me is the strange compression readings I am getting. It’s a 90 degree V8 with an overhead valve train. Well within tolerence with respect to each other. i what's 351W compression? F Series. 8 L Windsor V8) The 351 Windsor Engine. 8/351W) - compression ratio for a 94 5. Since this was a street-only engine, we purposely set our engineering goals very high. We required full Sep 2, 2010 · Re: 1973 Mustang 351 Cleveland Won't Start - SOLVED installed new timing chain and gears based on chain slack on the left side even though no slippage and timing marks lined up - see pics. Thanks for your input. Dec 7, 2009 · Being a mid 70's engine out of a granada, it would be a low compression engine. 8:1. The formula is: CR = V + Vcl clV Pay particular attention to the following points: Feb 29, 2016 · 3: 150 psi 4: 135 psi 5: 135 psi 6: 140 psi 7: 140 psi 8: 150 psi Wet Compression Test Results: 1: 170 psi 2: 180 psi 3: 175 psi 4: 170 psi 5: 160 psi 6: 180 psi 7: 180 psi 8: 150 psi I bring this up because these numbers are acceptable - and yet you found broken rings. 5:1 - 12. are my rings shot already or could it be a improperly working pcv system. 014" (the machine shop put in 70 pistons (bought the block from someone else)) the compression was 13. 8:1 following the block redesign. It cleaned them up but hurt power. 6/400, 351 Cleveland - Low Compression test numbers, now what? - I did a compression test, these are the results: 1 130 2 125 3 100 4 95 5 130 6 125 7 120 8 30 I don't know if I numbered them correctly, I started on the drivers front with #1, passenger front is #5. 8/351W) - 87' 302 compression psi range - What is the normal cylinder compression psi range for an 87' 302 ? LOG IN REGISTER What i don't know ist the right compression. 8l compression test|compression test on 351W : distributing Small Block V8 (221, 260, 289, 5. 1/370, 7. 8CC. ran a compression test on my F250 today (400 cid) and got numbers ranging from 95 psi to 125psi. 2:1 351w) had only 155. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. I want to be able to use regular 87 octane gas, if possible. I understand that the stock compression ratio on this motor is 8. Okay thank you for that, the normal range for compression on a stock 351 with stock pistons will run right at 150 PSI to 180 PSI give or take. The 351 that is in it is really tight. 050). Gasoline that you can easily run at 8. 5:1 range, the turbo was all done, and at the 16-18 psi, I was right where my projected HP goal was. You can get a lot more cranking compression with nothing but a cam change Here is a reverse example, my 427 is 11. It does have a Performer cam (204/214 @ . 2) did this year come with a roller cam? 3) I can get this motor for 600$ if it's in good shape is that a good deal (it comes with all the Jan 24, 2017 · After following Z's suggestion to loosen the valves and check compression, Squirt a tablespoon of oil into every cylinder and retest compression. Get accurate compression without the guesswork! Get your engine's optimal compression ratio and total displacement in no time flat! Just complete your engine setup, click calculate, and you’re on your way to maximum performance. The leak down test is a good test, but not necessary if compression tests turn good results. I just did a compression check and 6 of the 8 cylinders are in the 130-140 psi range. Sep 23, 2014 · What is the compression of a stock 351W? Jump to Latest 2. anyways i got good and maby bad news about my 88s rebuilt 351. O. Apr 18, 2002 · I was looking at Greg's compression test results as I have a 351w in an 87 f250 2wd with a c6 tranny. Cylinders 7 and 8 were about 30PSI. Its a 68, C Code. 29:1 . 3K views 3 replies 3 participants last post by TX 66 Sep 17, 2004 Nov 20, 2003 · This is a 351W with unknown bore, compression and heads. Don't worry about it. For the 13cc dish its giving me close to 10. Get a weak battery that can still crank over the engine. 772, flattop with 12cc valve reliefs. Apr 14, 2017 · Hi all, I recently (within the last year and a half), built my 351C. that and the fact that they ran leaded gas is what allowed them to run without detonation. at higher revs{5k plus** it pushes oil out of the dipstick. Is it normal to get higher readings the longer you crank? Apr 21, 2014 · If you are familiar with a modified 351W and nitrous and you have success with a good timing baseline, I would appreciate your suggestions! Here goes list of mods: 351W . I bought the engine as good, but you know how that goes. 600 in. Only that it should be even on all cylinder and 80 % of the original psi. Looking for more hp OK, we have a 1982 ski nautique with the PCM (ford) 351w. Compression ratio 8. 913 comp height) was for a 351m. 8/351W) - 351W - compression test #'s for gasket leak ? - My 94 F250 (owned for one month) has apparently got a head gasket leak (or crack). 5/460) - Stock 460 Cylinder PSI? - This motor is a relativley fresh rebuild (in a jet boat) Just ran a compression check a came out with varying results. Ford racing thought this was max for a pump gas engine. I got around 140 psi on my 351w with afr 185s (i think the 58cc comb. 98 inches. I am not sure what the compression should be, maybe around 140, but a good rule of thumb is that all cylinders be within 10% of each other. The junkyard I got it from told me that it had good compression. 8L motor have? Also I would appreciate any detailed specs you can offer. My book tells me these are 62. For instance of high of 150psi should have a low of 120psi. Turbo build: Aug 11, 2010 · Bimmerforums is the preferred online BMW Forum and community for BMW owners. Apr 13, 2015 · 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - 1986 f250 351w compression-advice? - Have a 88k mile motor with 130-140 psi on all cyls. It started acting up on me like a timing or ignition system issue. & '91 351 W w/ fuel injection? And b) what are the expected PSI readings with each engine (150-165)? 2) Can the '91 efi engine be used w/ a carb in '84 Econoline? Are there Feb 7, 2016 · I've run almost 16:1 (15. My 351w before I rebuilt it was making about 6-7 psi w/synthetic oils and ran fine; the most important thing is lubrication. Two of them are low, one at 75 . Choose your camshaft wisely and remember that the higher your static compression ratio, the narrower your tuning band gets, or more specifically, there is less chance of "missing" the tune without breaking parts. Calculations for a 351 CID engine are illustrated. 3 in (32. com Car Chat > Ford > F Series: what's 351W compression? Nov 30, 2003 · if we use dynamic compression ratios. 85 I figured 10. 0/429, 7. 8l? I think it's from a f-250. 020 over, compression height 1. Cylinder 2 was 70. Going to bore . Well i blew my water pump and when i had the shop do the repairs i had them throw on a 4 barrel intake off a 69 cougar and a brand new holley 600. Sep 7, 2011 · Well a buddy said to me the other day, you should take a compression test on that old engine-it's 100% stock & never been apart, but always has this chugging idle to it no matter what. Heads are GT40 heads, marked F1ZE-AA. Ring dimensions 5/64 5/64 3/16. Mar 22, 2017 · Will I be safe to run 10. I am ready to order a gasket, as I just got the pistons installed so I can measure deck clearance. 5 of them being 140. Mar 20, 2005 · Couldn't find excactly a 1990, but I did a search on google for 1990 351 compression and I found the 91 351 had a compression of 8. 4 psi. What is stock and what do you think is best to up those numbers? Truck sat 8 gyrs, was stuck. 120 PSI to 145 PSI Expected range for most stock or modified street motors. Apr 2, 2012 · Engine compression issues usually fall into one of two categories: A low compression is in some but not all cylinders. Sep 3, 2015 · Oil pressure will drop slightly when an engine is warm, but usually the rule is 10 psi per 1000k rpm or so (roughly). 00 x 3. The lowest cylinder reading should not be less than 80% of the highest reading. Jul 14, 2003 · The very simple, crude method for checking compression in a junkyard. com : Ford Forums Featuring a large, friendly Mustang enthusaist community with message forums, chat, classified ads, a performance analyzer, and the ability to post your own Mustang on our User's Rides section and upload your own pictures, sound, and video galleries. 8 L; 5,766 cc) Windsor featured a 1. Crank the engine and listen for even RPM on all the compression strokes. Aug 4, 2018 · Ford only rated these engines at 8. They take the stamped rockers. com; 630-587-1169; My Account. Idle PSI looks normal at around 25. 5 mm) taller deck height than the 289/302, allowing a stroke of 3. Apr 17, 2005 · Then again, the motor I had in the Maverick last year (14. You must have gotting the incorrect piston for that 69 block, my first pistons were sticking out of the hole . Aug 3, 2012 · So you can't say X amount of cylinder psi equals Y amount of compression ratio. The engine would start and run, but seemed to run oddly. com 1969 Mustang Engine Information – 351 cubic inch V-8 (5. Any thoughts on this? Dec 13, 2009 · The easiest way to fix the problem, and the most common, is to convert it to a 400. An old engine might have between 120 to 140 psi. . swe odtz nxa igeogil akkvw jevw cyrlzf rlw zcae ldgplw