Cast vs. Steel Crankshaft

njk53 · 06-18-2014, 01:42 PM

I would like an opinion from the engine builders on CR.

We run a BBC in a 4200 lb. car. One of our motors had a cast crank and the other had a forged steel crank. There are two schools of thought regarding cast vs. steel. The cast crank is lighter which in turn reduces the reciprocating mass of the engine producing more power. The other school of thought is to use a heavier steel crankshaft to keep the rotational momentum of the motor high due to the heavy weight of the car.

Anyone have experience on this subject?

06-18-2014, 01:42 PM	#1
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Cast vs. Steel Crankshaft I would like an opinion from the engine builders on CR. We run a BBC in a 4200 lb. car. One of our motors had a cast crank and the other had a forged steel crank. There are two schools of thought regarding cast vs. steel. The cast crank is lighter which in turn reduces the reciprocating mass of the engine producing more power. The other school of thought is to use a heavier steel crankshaft to keep the rotational momentum of the motor high due to the heavy weight of the car. Anyone have experience on this subject? __________________ Nelson Kowal Stock 345

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