FAO engine experts
13-10-2007, 11:20 AM
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FAO engine experts
If the compression of an engine was 30psi (or so) less then what it should be, would it cause it to run shite/smoke/be down on power etc?
14-10-2007, 12:28 PM
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Ah well 
my SX shows 120psi on all 4 bores with the accelerator pressed. typically they show 150psi ish but mine has a tiny little battery, due to the intercooler pipework, which causes it to crank over pretty slowly. Would this cause the lower compression reading?
It doesnt smoke, or run like a bag of shite and certainly doesnt feel down on power at all
my SX shows 120psi on all 4 bores with the accelerator pressed. typically they show 150psi ish but mine has a tiny little battery, due to the intercooler pipework, which causes it to crank over pretty slowly. Would this cause the lower compression reading?
It doesnt smoke, or run like a bag of shite and certainly doesnt feel down on power at all
14-10-2007, 12:31 PM
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Originally Posted by Rob84
It doesnt smoke, or run like a bag of shite and certainly doesnt feel down on power at all
The compression test is only good for showing a difference between the four cylinders. As long as they are all close to each other there's no problem.
14-10-2007, 12:37 PM
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Too many things can change the compressions on a test.
comp test Gauge accurancy,
battery turning,
engine temp,
cam and cam timing,
C/R
plus engine faults, which can loose or raise the comp, depending on fault.
comp test Gauge accurancy,
battery turning,
engine temp,
cam and cam timing,
C/R
plus engine faults, which can loose or raise the comp, depending on fault.
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14-10-2007, 12:39 PM
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Originally Posted by St3V3_C
Originally Posted by Rob84
It doesnt smoke, or run like a bag of shite and certainly doesnt feel down on power at all
The compression test is only good for showing a difference between the four cylinders. As long as they are all close to each other there's no problem.
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