Compression test results
So last night I got a ride in my friend's 1990 red miata. It was a blast and I fell in love with the little car - first convertible I was ever in!
We did a compression test later that night and the motor came out with 215psi compression across the board. The manual specifies 192psi compression and the tester was working fine. The motor has 160k miles on it. Has anyone seen such high compression on a broken in motor? |
Sounds like someone shaved the head, used a thinner head gasket, or changed pistons along the way if the test was done correctly. But that's just my guess:gay:
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yeah a motor I had came back at 205 psi per hole. I figured that my gauge may be a bit innacurate.... and hope that I didn't sell some bad ass built motor for $350.
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magic motor
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It shouldn't do it that much, but if it was owned by someone who rarely took the car above 4k rpm (as some "wine & cheesers" may be known to do), carbon buildup could also certainly raise compression as well. Time to do the fabled "ferrari tune-up."
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or maybe it's suckin oil into the CC ;)
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leak down test, it's the only way.
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we'll have to look into it some more, I don't think it's burning any oil and I don't think the motor was ever opened up but then again we don't know the complete history. It runs fairly well however.
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Originally Posted by y8s
(Post 117463)
or maybe it's suckin oil into the CC ;)
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Originally Posted by olderguy
(Post 117421)
Sounds like someone shaved the head, used a thinner head gasket, or changed pistons along the way if the test was done correctly. But that's just my guess:gay:
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Originally Posted by LOLA - 92
(Post 117570)
Or -- Massive amounts of Carbon Build-up! :gay:
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my compression was 200 across the board.i should let it sipp on some water,but im scared.
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Originally Posted by turbopezz
(Post 117635)
my compression was 200 across the board.i should let it sipp on some water,but im scared.
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yes,thats what ive been reading..i might do it tonight so no one calls the fire department.
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Originally Posted by turbopezz
(Post 117645)
yes,thats what ive been reading..i might do it tonight so no one calls the fire department.
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Yay fouled plugs and caked 02 sensors.
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you guys don't like seafoam?
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Seafoam rules! 160k worth of carbon buildup? hehe
EDIT - And no more mosquitos for the evening! =) |
Originally Posted by Lex
(Post 117710)
you guys don't like seafoam?
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i let my car sip a very very little bit of water ..and you can actually here a difference the motor sounds a little smoother quiter.
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