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compression

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Old Sep 28, 2005 | 08:03 PM
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StangStang
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From: va
Default compression
I am doing a compression test on my 92 mustang lx 5.0 I know the compression is 9:1 but what should I be looking for on the compression tester in Psi??
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Old Sep 28, 2005 | 08:40 PM
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Default RE: compression

ORIGINAL: StangStang

I am doing a compression test on my 92 mustang lx 5.0 I know the compression is 9:1 but what should I be looking for on the compression tester in Psi??

How much psi depends on the motor and how old it is. I would just look for something above 100 psi and every cylinder VERY close to each other.
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Old Sep 28, 2005 | 08:56 PM
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Default RE: compression
exactly. its not so much the psi but the cylinders should be within 5 psi of each other if not the same. you will probably be around the 125 mark
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Old Sep 28, 2005 | 09:13 PM
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Default RE: compression
120 is hte lowest you want to see and thats a worn motor..... my motor read 30psi so its gone and parts are for sale
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Old Sep 28, 2005 | 10:09 PM
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Default RE: compression
ok, on a new engine what should the psi be just for the record. Also where can I get an awesome service manual???
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Old Sep 28, 2005 | 11:12 PM
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Default RE: compression
new motor should be around 150 or so
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Old Sep 29, 2005 | 07:51 PM
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Default RE: compression
You are 'ok' on any used motor if the lowest cylinder is within 10% of the highest one.....
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