 first compression test fails, second passes, can compression improve? |
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| siverson |
 Aug 11 2013, 12:16 AM
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#1
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Advanced Member  Group: Benefactors Posts: 2,458 Joined: 5-May 03 From: San Diego, CA Member No.: 654 Region Association: Southern California 
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Hi,
I'm looking at a -6 that had on compression test on 7/24 and the results were: 1-160 2-170 3-155 4-150 5-170 6-110 That car has sat for quite a while but the owner says it runs well. He asked the same shop to test the compression on 7/31 and now cyl #6 is showing 140. Can compression improve when taking a car out of storage and driving it? Or is this just sloppy work on the shop that did a PPI? -Steve |
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| PancakePorsche |
Aug 11 2013, 12:49 AM
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#2
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Member Group: Members Posts: 236 Joined: 29-July 11 From: Southern California Member No.: 13,373 Region Association: None |
Yes it can. rings could free up, valves seats can clear up, and more oil on pistons from cranking can increase pressure. valve clearances must be checked before performing compression test.
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Posts in this topic
siverson first compression test fails, second passes Aug 11 2013, 12:16 AM
Joe Sharp :agree: Yeah Steve, what he said. Aug 11 2013, 06:03 AM
rgalla9146
:agree: Yeah Steve, what he said.
maybe forgot t... Aug 11 2013, 06:11 AM siverson Got it, thanks.
-Steve Aug 11 2013, 11:57 PM Woody Could have had a chunk of carbon holding a valve o... Aug 12 2013, 08:15 PM scotty b Once it runs again, it can improve even more as ev... Aug 12 2013, 08:24 PM |
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