The Ford Barn

James Rogers · 10-02-2012, 04:46 PM

I have a B engine that a customer wants re-built. The engine had a Model A flywheel on it. I know the outside perimeter of the B flywheel is smaller than the A but is there a reason for this difference? I have an idea but am not sure of my notion.

Charlie Stephens · 10-02-2012, 05:29 PM

Quote:

Originally Posted by James Rogers

I have a B engine that a customer wants re-built. The engine had a Model A flywheel on it. I know the outside perimeter of the B flywheel is smaller than the A but is there a reason for this difference? I have an idea but am not sure of my notion.

It is my understanding that if you try to run a Model A flywheel with a Model B transmission the flywheel will interfere with the bellhousing.

Charlie Stephens

JoeWay · 10-02-2012, 06:58 PM

I would expect a flywheel that was originally installed on a factory counterbalanced crank to be lighter than an A flywheel.

It may also be that by 1932 Ford had decided flywheels just didn't need to be so heavy anyway.

Since B flywheels are smaller on the OD, Ford could build the new bellhousings smaller (and lighter and cheaper) to match.

Joe

James Rogers · 10-02-2012, 08:57 PM

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I also found out, if you run a Model A flywheel on a B engine with a full B flywheel housing and pan, You can't get the flywheel out without removing the pan. The B housing doesn't interfere with the A flywheel until you need to remove it. I guess this is because the housing and pan part are smaller.

10-02-2012, 04:46 PM	#1
James Rogers Senior Member Join Date: May 2010 Location: Asheville,NC Posts: 3,104	A and B flywheels I have a B engine that a customer wants re-built. The engine had a Model A flywheel on it. I know the outside perimeter of the B flywheel is smaller than the A but is there a reason for this difference? I have an idea but am not sure of my notion. __________________ http://www.model-a-ford-4bangers.com/

10-02-2012, 06:58 PM	#3
JoeWay Senior Member Join Date: May 2010 Location: Quincy CA Posts: 752	Re: A and B flywheels I would expect a flywheel that was originally installed on a factory counterbalanced crank to be lighter than an A flywheel. It may also be that by 1932 Ford had decided flywheels just didn't need to be so heavy anyway. Since B flywheels are smaller on the OD, Ford could build the new bellhousings smaller (and lighter and cheaper) to match. Joe __________________ 1929 Tudor since 1962 Feather River A's

10-02-2012, 08:57 PM	#4
James Rogers Senior Member Join Date: May 2010 Location: Asheville,NC Posts: 3,104	Re: A and B flywheels Sponsored Links (Register now to hide all advertisements) I also found out, if you run a Model A flywheel on a B engine with a full B flywheel housing and pan, You can't get the flywheel out without removing the pan. The B housing doesn't interfere with the A flywheel until you need to remove it. I guess this is because the housing and pan part are smaller. __________________ http://www.model-a-ford-4bangers.com/