Cyl 3 spark plug came appart.
#1
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Cyl 3 spark plug came appart.
Cruising at 3500rpm and boom. Turned the key off and the engine was still trying to run. Bbc 509cid.
Last edited by JaniH; 09-24-2022 at 02:50 PM.
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check your timing, had same issue happen to me......preignition that i couldn't hear
in my case my distributor loosened and one tight wire pulled it counterclockwise
best .
in my case my distributor loosened and one tight wire pulled it counterclockwise
best .
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JaniH (09-24-2022)
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JaniH (09-24-2022)
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What delco plug # you using ?
#10
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Ok, the cyl 3 has 10bar compression, wich is 3bar less compared to other cylinders (13bar). Made leakdown test that measured 90%(cold engine) and got more confused, pressure seems to go in intake manifold, exhaust manifold and crakcase. Conclusion is that intake/exhaust valves are leaking, not sure about the piston rings because the large ring end caps and piston to wall clearance, due 2680 forged pistons. Took some pictures of the exhaust ports/valves/spark plugs. Removed the cmi sound eliminator mufflers, wonder if the mufflers caused reversion and caused all this. Other one of those mufflers feels tight compared to the other one. Dont know 🤥🤥
Cyl 3
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Cyl 3
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