1990 Ferrari Testarossa Repair Question
Mileage: 36,000 miles.
1990 t.r. compression test
Did you ever find out? I'd say a minimum of about 150-160psi but cylinder variance is more important. Its based on compression ration, a '90 shouldn't be to high though. Its not likely all the cylinders are bad, if any, so the highest is probably very accurate, they should be within about 10-15 psi of each other.
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