Quote:
Originally Posted by john_cramer
You have broken rings in all likelihood.
The leakdown doesn't lie. I measured 45% leakdown in a couple jugs of my 2,0. I scratched my head and said, "wonder why that is?" Maybe I'll repeat the test! Repeated the test, same thing.
Tore the engine down and. . . broken rings. Either caused by a "rebuild" in 1982 in which the rings were replaced even though the ring grooves had worn beyond spec, or by detonation caused by WAY too much advance from the worn-out distributor. Or both.
4% Leakdown is good. 10% is borderline. 30% is teardown time.
Leakdown Results 1966 911 Normal |
I'd be tearing down now if I were at 45%. I really dont think 30% is teardown time.. I think its marginal and I think I need to drive.. broken rings should be reproduceable as far as the readings.. Im not getting reproduceable.. I also noticed you didnt mention a compression test. Mine is pretty close to be in spec... one cyl off.. Did you do a compression test too?
BTW.. did you end up with new pistons and salvaging the holes?