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Old 01-05-2010, 11:47 PM   #1
builtsubie
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Default Compession test prob

I did a compression on my 06 sti it has drop in wiseco pistons an bc 272 cams i did it on a coldmotor b/c the car has no turbo on it an these are theses are the numbers i got 120-95-110-110 is that normal with drop ins an acoldmotor? thanks
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Old 01-05-2010, 11:57 PM   #2
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Um... wat

You did it on a cold motor. That's most of your problem.

How many miles on the built motor?
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Old 01-06-2010, 12:13 AM   #3
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warm it up and repeat. That's my vote. 95 is quite low in comparison to 120.
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Old 01-06-2010, 12:30 AM   #4
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+1
agreed.

Do it warm, but i agree 95 is the odd ball. Hopefully it cleans up when warm.

DK
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Old 01-06-2010, 02:10 AM   #5
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well i havent started the car in 5 days bf doing this test thebmotor has about 3000 mileson it
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Old 01-06-2010, 11:18 AM   #6
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that is a little funky. can you try a leakdown test?
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Old 01-06-2010, 11:56 AM   #7
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Quote:
Originally Posted by kevinh211 View Post
that is a little funky. can you try a leakdown test?
Yeah, a leakdown test when cold is just as useful as a compression test when cold.
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Old 01-06-2010, 02:09 PM   #8
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i now did the compression test on a warm motor i let the car warm up an i got 120 each for all four about 119-120 if that normal thanks
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Old 01-06-2010, 03:49 PM   #9
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could the bc 272 cams an wiseco pistons lower the compression? another thing its lowing white smoke from oil filler cap an the 2 hoses that come off the valve covers im puzzled all the cylinders are the same 120. the onlything im thinking is jummping timing on the motor??
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Old 01-06-2010, 04:28 PM   #10
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blowing smoke out of the filler usually isn't a good thing,it should suck n blow
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Old 01-06-2010, 09:17 PM   #11
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? anyone have an idea
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Old 01-07-2010, 06:00 AM   #12
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bump!
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Old 01-07-2010, 07:31 AM   #13
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Quote:
Originally Posted by builtsubie View Post
could the bc 272 cams an wiseco pistons lower the compression? another thing its lowing white smoke from oil filler cap an the 2 hoses that come off the valve covers im puzzled all the cylinders are the same 120. the onlything im thinking is jummping timing on the motor??

White smoke is water. I bet you have a bad HG or the water pipe seals between the block halves is bad. Are you getting milky film in the oil cap after letting it run for awhile? Check the oil level after running it. Is the oil level rising? I think you should drop the oil pan and pressure test the coolant system to see where the water is getting in.

A little bit of blue or black smoke is generally OK from those areas but not white.
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Old 01-07-2010, 01:32 PM   #14
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im lost im not sure how that can be when i have arp headstuds im not
saying it cant be im checking my timing today
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Old 01-07-2010, 05:46 PM   #15
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Quote:
Originally Posted by builtsubie View Post
im lost im not sure how that can be when i have arp headstuds im not
saying it cant be im checking my timing today

Headstuds are not a Guarentee aginst blown HG's. They also do nothing for the seals in between the block halves.

Hopefully neeither of those is what's wrong, but white smoke is always some sort of condensation or water.
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Old 01-11-2010, 01:46 AM   #16
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the oil looked fine it just smelled lil like gas idk why bit is 120 on all 4 bad for the compression test the oil level was the came i just dont understand this smoke coming from thefiller caps an the valve cover vents.
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