Quote:
Originally Posted by maytag
And what sort of numbers are acceptable for a motor at 150k miles?
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Under 5% is preferable. But I'd say that anything less than 10% is probably ok on a well worn engine. This engine had 90K street miles when I installed it in my car. Then I had added 70 track hours of racing on top of those miles! That's got to be equal to 150K or more street miles.
If you see anything like 15% or 25% leak down, its time to worry. With low compression and poor leak down numbers in cyls 4 and 5, I knew that this engine was on its way out. It finally failed 11 track hours after this test.
The fact that your compression numbers are good brings hope that the leak down numbers will also be good. Best of luck.
