 Compression Check Acceptable Numbers?, Compression Check |
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| 91422.7 |
 Apr 25 2015, 05:20 PM
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#1
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Newbie  Group: Members Posts: 36 Joined: 8-October 14 From: Eugene, Oregon Member No.: 17,991 Region Association: Upper MidWest  |
I'm working on a friends car and we checked the compression with it cold. We retrieved the following readings: #1 cyl 70 lbs, #2-80 lbs., #3-80 lbs., #4-100 lbs., Engine has been running for about 6 months. Based on these readings what do you suggest? Is it ok to go ahead and get the engine running and drive it like it is or are you taking a chance of doing further damage? Run some diesel or ATF through the carbs and see if that would loosen the valves up some, then recheck Compression after a few hundred miles or is it time to tear it down and do a Valve job? Thanks for any suggestions.
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| somd914 |
Apr 25 2015, 06:33 PM
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Member Group: Members Posts: 1,171 Joined: 21-February 11 From: Southern Maryland Member No.: 12,741 Region Association: MidAtlantic Region |
Agree numbers are bad, and agree it has to be done on a hot engine with throttle wide open. However, I thought 120-130 was on the lower end, but I can't seem to find any definitive numbers right now.
You also don't like to see a spread of more than 10% or so. Valve adjustment can affect numbers also. |
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Posts in this topic
91422.7 Compression Check Acceptable Numbers? Apr 25 2015, 05:20 PM
91422.7 I forgot to mention the engine is a 2.0L out of a ... Apr 25 2015, 05:21 PM Vacca Rabite Those are shit numbers.
Was the engine hot, and t... Apr 25 2015, 06:15 PM 91422.7 Engine was cold, throttles (dual Weber 40s) were c... Apr 25 2015, 06:26 PM 91422.7 Sounds good, we will get the engine running, let i... Apr 25 2015, 06:44 PM euro911 Don't be too quick to judge. The #s didn't... Apr 25 2015, 09:02 PM Mike Bellis Make sure the valves are adjusted properly first. Apr 25 2015, 10:00 PM Dave_Darling Adjust the valves and get it running. If those ar... Apr 25 2015, 10:34 PM Vacca Rabite Check the valves for sure.
Engine needs to be h... Apr 26 2015, 06:39 AM rgalla9146 The fault with those numbers is mostly the closed ... Apr 26 2015, 08:03 AM
The Cabinetmaker Do like the others have said with all plugs remove... Apr 26 2015, 08:39 AM |
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