Compression Test Results
What are yours?
my 1 and 2 were 105psi 3 and 4 were 95psi low or no? recently had the dipstick blow out.... but the catch can was clogged so, are these low or average? |
I might be wrong, but i thought your readings should be around 150 for a healthy engine.
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ya, sounds low to me.
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looking for someone with experience. Thanks!
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I have compression tested a few 4b11ts now. The readings seem to vary from cylinder to cylinder, motor to motor, and even test to test on the same cylinder. It has to be something to do with the mivec on both cams floating around with the lack of or low oil pressure/control.
A leakdown test will show you the true health of your motor and show any problems that you may have. Basicly if the cranking compression sounds healthy, the car makes the power it should, doesn't smoke or make noise, then its probably fine. If you don't know what a car sounds like when cranking with a dead or low cylinder, pull one plug out and crank it and thats what it will sound like. |
Good information Eric. Thanks
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Originally Posted by EricJ@AMS
(Post 7714345)
I have compression tested a few 4b11ts now. The readings seem to vary from cylinder to cylinder, motor to motor, and even test to test on the same cylinder. It has to be something to do with the mivec on both cams floating around with the lack of or low oil pressure/control.
A leakdown test will show you the true health of your motor and show any problems that you may have. Basicly if the cranking compression sounds healthy, the car makes the power it should, doesn't smoke or make noise, then its probably fine. If you don't know what a car sounds like when cranking with a dead or low cylinder, pull one plug out and crank it and thats what it will sound like. I will do a leake down this week. |
I tested my car... They were about ~145 across all 4-cylinders. Tested on a hot motor.
IIRC, the values should be within 10% of 150. So between 135 and 165 PSI. This is for stock motor. |
Originally Posted by Clipse3GT
(Post 7715937)
I tested my car... They were about ~145 across all 4-cylinders. Tested on a hot motor.
IIRC, the values should be within 10% of 150. So between 135 and 165 PSI. This is for stock motor. |
Eric's explanation makes sense, something I didn't think of. With 9:1 compression, I was surely expecting 180+ psi per cylinder. Hell, my old 2g dsm with 8.5:1 gives me 175 across the board.
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damn thats low brother! the good thing is they are not too far apart from each other. It's suppose to be like 10 percent. You should be around 145 and up...make sure you do the test after you got the engine hot ....
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Originally Posted by XEVOX08
(Post 7716300)
damn thats low brother! the good thing is they are not too far apart from each other. It's suppose to be like 10 percent. You should be around 145 and up...make sure you do the test after you got the engine hot ....
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Originally Posted by UT_EvoX
(Post 7716433)
Hot vs. cold will make a ~5 psi difference at most on an engine with hypereutectic pistons like ours. {thumbup}
crossing fingers. |
Originally Posted by meat_EVO
(Post 7716640)
well well, maybe mine is super low even still. i guess i need to warm it up and crank it again. looks like a leake down test will need to be done as well.
crossing fingers. |
Originally Posted by UT_EvoX
(Post 7716853)
How many times did you let the engine turn over while you were testing it? I like to do at least 6-8 compression cycles to get a good reading, else it will read low.
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