compression test
#1
compression test - *updated with numbers!!!*
Before I go and buy a DO WI kit I want to make sure the compression is good on my engine.
Its done 141,000 km now thats 87000 miles.
My tuners recommended i do so.
So what should I be firing on all for cylinders? whats a good reading and whats a bad reading?
cheers
Its done 141,000 km now thats 87000 miles.
My tuners recommended i do so.
So what should I be firing on all for cylinders? whats a good reading and whats a bad reading?
cheers
Last edited by tabs604; 01-27-2007 at 08:45 AM.
#2
90 is bad, 130-150 has been common good compression in my experiences with Miatas. If one cylinder is way lower than the others then you have problems. If you find that you have low compression in a cylinder, put a spoon of oil in that cylinder. If the compression goes back up, then you know your rings are shot. If it doesn't go back up its your valves or something else.
Pull your injector relay and disconnect your coils when doing the test. Hold the throttle to the floor while cranking as well.
Not sure what else there is that you're supposed to do, i just know you don't want fuel spraying and it's hard on your coils to just crank like that.
EDIT: Also make sure your motor is warm as well.
Anything else I'm forgetting?
Pull your injector relay and disconnect your coils when doing the test. Hold the throttle to the floor while cranking as well.
Not sure what else there is that you're supposed to do, i just know you don't want fuel spraying and it's hard on your coils to just crank like that.
EDIT: Also make sure your motor is warm as well.
Anything else I'm forgetting?
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