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Need Help Reading Compression Test Results

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99OZDSM

15+ Year Contributor
267
44
Jun 16, 2007
Virginia Beach, Virginia
As the title reads. I did both dry and wet tests and got these numbers starting from cylinder 1, near the timing belt to cylinder 4 towards the battery. Also, take note that these numbers are from a fairly warm engine, about 15 20 mins shut off so the results are not from operating temperatures.

Dry
C1-150
C2-165
C3-195
C4-180

Wet
C1-180
C2-210
C3-230
C4-205

Correct me if I'm wrong but the increased wet test results mean I have a worn or damaged ring or cylinder wall? Any and all advice is greatly appreciated.
 
As the title reads. I did both dry and wet tests and got these numbers starting from cylinder 1, near the timing belt to cylinder 4 towards the battery. Also, take note that these numbers are from a fairly warm engine, about 15 20 mins shut off so the results are not from operating temperatures.

Dry
C1-150
C2-165
C3-195
C4-180

Wet
C1-180
C2-210
C3-230
C4-205

Correct me if I'm wrong but the increased wet test results mean I have a worn or damaged ring or cylinder wall? Any and all advice is greatly appreciated.

Them are some pretty wild numbers there. And you will see a jump in compression with a wet test no matter what. Did you by chance use a cheap gauge? Or do you have high compression pistons?
 
Correct me if I'm wrong but the increased wet test results mean I have a worn or damaged ring or cylinder wall? Any and all advice is greatly appreciated.
I'd put my money on cylinder wall wear.

The wet test numbers are within factory spec (170 - 255psi, <25% variance). Are these factory pistons?
 
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