The Ford Barn - View Single Post - Float-A-Motor Mount on 28 roadster with fixed front mount

nkaminar · 09-30-2023, 12:37 PM

Being a mechanical engineer, you know that a conventional inline engine cannot be completely balanced because the small end of the con rod is moving in a linear motion and the big end of the con rod is moving in a circular motion. However, using a completely counter balanced crank will help with the vibrations. Machine collars to go around the rod journals that weigh 100% of the weight at the big end and maybe 67% of the weight at the little end (including pin, pistons, and rings). Have the crank balanced with the collars on the journals.

If you want to keep the solid mounts in front, you could come up with some sort of rubber isolation system, like grommets and necked down bolts. You could keep the original bolts in case someone in the future wanted to change it back to stock. To add rubber between the engine and the mount, you could machine off some material from the cam gear cover that the mount bolts to. I don't expect this to be as good as the spring system that Ford came up with.

09-30-2023, 12:37 PM	#10
nkaminar Senior Member Join Date: Jan 2012 Location: Western North Carolina Posts: 4,031	Re: Float-A-Motor Mount on 28 roadster with fixed front mount Being a mechanical engineer, you know that a conventional inline engine cannot be completely balanced because the small end of the con rod is moving in a linear motion and the big end of the con rod is moving in a circular motion. However, using a completely counter balanced crank will help with the vibrations. Machine collars to go around the rod journals that weigh 100% of the weight at the big end and maybe 67% of the weight at the little end (including pin, pistons, and rings). Have the crank balanced with the collars on the journals. If you want to keep the solid mounts in front, you could come up with some sort of rubber isolation system, like grommets and necked down bolts. You could keep the original bolts in case someone in the future wanted to change it back to stock. To add rubber between the engine and the mount, you could machine off some material from the cam gear cover that the mount bolts to. I don't expect this to be as good as the spring system that Ford came up with. __________________ A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 09-30-2023 at 12:50 PM.