The Ford Barn - View Single Post - Is a lightened flywheel overrated? (I think so)

Ian Crawford · 01-22-2024, 08:01 AM

I can't seehow a lighter flywheel will have any effect on the main bearings. If you take that the flywheel weight is about 63lbs and that on an original engine with a 4.2 c/r the cylinder pressure is about 75PSI. The stock bore is 3.875 so the piston area is 11.80 sq/in which would give us a force of about 884lbs directly on the closest main bearings. That is without the engine even firing. I really don't see that if the flywheel weight is 38lbs or 63lbs would make any noticeable difference. The ballance of the flywheel/clutch assy. will however have a dramatic effect as the out of ballance effect increases by its speed (RPM).

01-22-2024, 08:01 AM	#10
Ian Crawford Junior Member Join Date: Jun 2013 Location: Botswana Posts: 14	Re: Is a lightened flywheel overrated? (I think so) I can't seehow a lighter flywheel will have any effect on the main bearings. If you take that the flywheel weight is about 63lbs and that on an original engine with a 4.2 c/r the cylinder pressure is about 75PSI. The stock bore is 3.875 so the piston area is 11.80 sq/in which would give us a force of about 884lbs directly on the closest main bearings. That is without the engine even firing. I really don't see that if the flywheel weight is 38lbs or 63lbs would make any noticeable difference. The ballance of the flywheel/clutch assy. will however have a dramatic effect as the out of ballance effect increases by its speed (RPM).