compression test good or bad? - Dodge SRT Forum
 
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post #1 of 6 (permalink) Old 11-21-2012, 01:13 PM Thread Starter
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compression test good or bad?

ok so yeah i did a compression test today on a stock bottom end car with stage 2 bc cams /mpx gears and bolt ons with a zeta 2.8 turbo kit it read 160 180 180 180? is this good or bad and do i have a problem with a vlave ? or whats going on with it it runs good besides idle is rough unlike most cars with cams i have seen the car is un-tuned still also so who knows
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post #2 of 6 (permalink) Old 11-21-2012, 01:26 PM
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i think the rule of thumb is u dont want more than 10% difference....

looks like 11.1111111%

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post #3 of 6 (permalink) Old 11-21-2012, 03:20 PM
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theres no way to tell exactly where the leakdown is until you do a LEAKDOWN TEST.

How To Perform A Leak Down Test - EricTheCarGuy - YouTube

Heres a good video of how to do one. or if you wanna do another test, whatever cyl is 160, pour a little oil into the cyl and do the compression test again. that will tell you weather or no its a ring issue. if compression raises significantly, its a ring problem. if not, then its either your head gasket, or a valve

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post #4 of 6 (permalink) Old 11-21-2012, 04:34 PM Thread Starter
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?

could it be possible nothing is wrong or not bad enough anyway with out removing head or timing components possibly cam gears need adjusted ? idk just guessing
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post #5 of 6 (permalink) Old 11-22-2012, 12:07 PM
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If the car is untuned, that is more then likely your reason for the rough idle.

Retest the low cylinder.
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post #6 of 6 (permalink) Old 11-22-2012, 12:29 PM
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did u do a dry test or wet test? it sounds fine your almost within the 10% tolerance i just did mine 165 across the board with 97k on stock motor
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