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Old 10-19-2019, 01:46 PM   #3
Purdy Swoft
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Join Date: May 2010
Location: Alabama
Posts: 8,099
Default Re: Model B crank in Model A

I think that the counterbalanced crankshaft was suppose to run smoother with less vibration.

The model B crankshaft has larger bearing journals .

Larger journals help make a stronger engine.

Model B crankshafts can have the main bearing journals reground to model A size .

Larger rod bearing journals allows for the use of model B rods .

The counterbalanced crankshaft will not cause the engine to run faster .

If anything a heavier crankshaft will reduce acceleration and throttle response.

If I used a model B crankshaft in a model A engine , I would prefer the unbalanced 1932 version .

I would get the larger rod bearing journals with the early B crank without the extra weight of the 33 and later counterbalanced B type cranks .

I've been told that the counterweights don't really take out the vibration

This would just be my choice and why , not a recommendation ...
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