Re: compression test - Saab 900 Bulletin Board - Saabnet.com
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Re: compression test
Posted by Beaudreau (more from Beaudreau) on Mon, 5 Mar 2001 20:44:00
In Reply to: comprassion test, Tony B., Mon, 5 Mar 2001 19:53:23
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I'd say that I could live with it.
A few questions:
Cold or hot test? (Cold is usually lower than hot, I usually do both)
Did you hold or wire the throttle open? (intake restrictions will lower your readings)
How many hits did it take to reach your final reading? (Most of my tests go like this, 90psi, 120psi, then your final reading)
Did you do a wet test? (This will tell you if the lower readings are due to ring wear or if you have a valve seal problem)
I have an '85 Turbo motor that now has 300k+ miles and it tests within 10% of 155psi all around, I first tested it with 18k on the clock and it was 165psi all around, original turbo too. This motor has seen nothing but Castrol Dino oil.
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