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john in illinois · 01-30-2020, 10:22 AM

I have found that most of the detonation I have experienced is due to running too lean. Flatheads will run ok with a lean mixture, but still get damaged. JWL book has a good section on jetting. Might be good to compare to make sure that is not your problem, after you repair the engine.

John

01-30-2020, 10:22 AM	#35
john in illinois Senior Member Join Date: May 2010 Location: Illinois Posts: 2,184	Re: Installing replacement pistons I have found that most of the detonation I have experienced is due to running too lean. Flatheads will run ok with a lean mixture, but still get damaged. JWL book has a good section on jetting. Might be good to compare to make sure that is not your problem, after you repair the engine. John __________________ Welcome each day Last edited by john in illinois; 02-24-2020 at 11:51 AM.