Thread: Engine knock
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06-23-2005 04:59 PM #1
Engine knock
Well this isn't good. We have developed a knock in a 383 stroker. It sounds like piston slap. It only happens at very low idle or under load (stopped and in gear- it's an automatic). We did a hot compression test and found that #7 is running about 25 pounds higher than the rest. Most are running about 170, #7 is running at 200. We just ran it and started disconnecting plug wires one at a time to see if we could get the knock to stop. When we disconnected #7, it stopped knocking.
So the question is - why is #7 compression so high? Or why are the rest so low?
John's ride to the cemetery, his beloved Billings OK bus, The Baby Elephant!! Traveling in style!! As his service was starting I couldn't figure out what the music was, heavy on a flute in a jaunty...
John Norton aka johnboy