The Ford Barn - View Single Post - When going for SCAT crank should you lighten flywheel? If so, how much?

wensum · 02-26-2020, 05:17 PM

In building a fast road engine for my speedster I had the flywheel reduced to 35lbs (fitting a diaphragm clutch) and the crankshaft had counterweights welded to it and all fastidiously balanced
Within 5000 miles it was discovered that the crankshaft was cracked (it had been crack tested before fitting)
I then fitted a Burlington crank, but continued to be plagued by loud timing gear chatter and vibration periods (possibly due to the modifications) despite fitting a matched set of bronze and steel timing gears.
Fitting a harmonic balancer pulley removed all those issues like magic and I can only hope that also it will contribute to the reliability and long-term life of the engine?

02-26-2020, 05:17 PM	#10
wensum Senior Member Join Date: Apr 2011 Location: New Zealand Posts: 444	Re: When going for SCAT crank should you lighten flywheel? If so, how much? In building a fast road engine for my speedster I had the flywheel reduced to 35lbs (fitting a diaphragm clutch) and the crankshaft had counterweights welded to it and all fastidiously balanced Within 5000 miles it was discovered that the crankshaft was cracked (it had been crack tested before fitting) I then fitted a Burlington crank, but continued to be plagued by loud timing gear chatter and vibration periods (possibly due to the modifications) despite fitting a matched set of bronze and steel timing gears. Fitting a harmonic balancer pulley removed all those issues like magic and I can only hope that also it will contribute to the reliability and long-term life of the engine?