 Using Compression Data |
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| damnfiknow |
 Oct 2 2010, 09:44 AM
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Member  Group: Members Posts: 77 Joined: 25-October 09 From: Texas Member No.: 10,980 Region Association: None  |
From old water cooled days, generally balanced compression readings, even if 10% or more below specs, were not a really bad thing. But, I'm having trouble with even running/surges/etc at low RPM on a 1.7. Same with FI, dual, and progressive carbs. Readings are 120 across the board, +/- 3 lbs. Injection of oil in cycls doesn't effect readings. Engine is out and on test block, so pulling heads wouldn't be a big task. But is it worth it? Or live with ups and downs?
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| VaccaRabite |
Oct 2 2010, 03:00 PM
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En Garde! Group: Admin Posts: 13,444 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Compression of 120 is decent butnot perfect. Not at rebuild land though. Check leakdown too while the engine is out. With compression numbers it gives a better impression of the engine.
Check your valves. Make sure the engine is warm and the throttle wide open. All of these things impact compression scores. |
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