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Old 06-01-2010, 09:08 PM   #1
Dane509
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Default Compression Test Results. OK?

Started up my car and drove about 10 minutes to the dealership for a compression test. Car probably sat for another 10 minutes before being taken in for the test, so the motor was decently warm, but not overnight sitting cold.

2004 STi
72,xxx miles

Cylinder 1 - 135
Cylinder 2 - 135
Cylinder 3 - 150
Cylinder 4 - 140

The 150 and 140 look fine to me but the 2 135's seems a bit odd to me. Or am I just being worried over nothing?
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Old 06-01-2010, 09:15 PM   #2
ShaneInHisRoom
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Quote:
Originally Posted by Dane509 View Post
Or am I just being worried over nothing?
Yarp.
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Old 06-01-2010, 09:16 PM   #3
THEVERGE
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I don't think those numbers are good. They should be within, I think, plus or minus 5 psi to be kosher.
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Old 06-01-2010, 09:18 PM   #4
Dane509
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1 yay and 1 nay. Anyone else?
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Old 06-01-2010, 10:06 PM   #5
jerbull88
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you=ok
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Old 06-01-2010, 10:53 PM   #6
synolimit
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135 seems low for these motors. 145-150 is good. and with the large difference throws me off too. how many cranks where done on each cyclinder? you should only do about 4 cranks on each.
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Old 06-01-2010, 11:25 PM   #7
Dane509
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I'm not too sure. They handed me the paperwork and told me that 135 is a little low but it's still fine. But I don't know how many cranks were done on each cylinder. Just weird to me that #1 #2 cylinders were 135 and the other two are way within spec.
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Old 06-02-2010, 01:36 AM   #8
07wrx4life
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Quote:
Originally Posted by THEVERGE View Post
I don't think those numbers are good. They should be within, I think, plus or minus 5 psi to be kosher.
All cylinders should be within 10% of each other not 5 psi, just letting you know.

135 on 2 cylinders Is a little low but I wouldn't cry about it just yet 120 or lower would really show signs of a dieing motor.


Keep on boostin Op
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Old 06-02-2010, 03:16 AM   #9
Coop1103
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Out of curiosity..how much did this compression test run you through the dealer?
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Old 06-02-2010, 11:21 AM   #10
Dane509
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I'll need to take a look because I got new plugs and an oil change at the same time. I think everything came out to about $350. Sucks when there isn't really anywhere else in town I can take the car for that stuff besides the dealer.
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Old 06-02-2010, 12:37 PM   #11
Acejam2k
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You're fine. As long as it's not like 130-130-130-45, you're good to go.
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Old 06-02-2010, 12:46 PM   #12
Sifounas
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Yeah ideally you want them to be closer, but if you had a blown piston the reading would be much lower than 135.
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Old 06-02-2010, 03:27 PM   #13
Dane509
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I guess my second question would be, would it still be safe to throw my car up on a dyno? I'm planning on getting it tuned here pretty soon and just want to make sure everything looks good before doing so.
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