post #1 of Old 10-23-2013, 09:57 AM Thread Starter
krazybob
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1988 YJ Wrangler 
 
Join Date: May 2013
Location: mountain home
Posts: 51
compression for a 4.2L motor ?

I checked my compression in my 1988 4.2L engine, and all cylinders are right at 130# Can someone tell me what the optimum pressure should be so I can tell how my engines compression compares ?


Krazybob,, Mtn. Home, Idaho
My goal, is to die young,,
at a very old age
1988 YJ 4.2 5sp
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post #2 of Old 10-23-2013, 09:46 PM
uberxj92
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1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla
Posts: 1,961
150ish on a fresh motor us good. You have great compression for an 88.

http://www.jeepforum.com/forum/f177/92-xj-sadness-2075657/index2.html
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post #3 of Old 11-16-2013, 01:17 PM
fastfreddie
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Join Date: Dec 2007
Posts: 615
The important thing with compression checks is, as in your findings, the numbers are the same across the board. That's impressive for an older engine.
A leak down test is prolly what you're looking to do to find out if the engine is tired.
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