The Ford Barn

glenn in camino · 07-01-2012, 03:26 PM

What is the difference between a B crankshaft and a double B crankshaft?

Charlie Stephens · 07-01-2012, 04:00 PM

The first Model B crankshaft looked like a Model A crankshaft except bigger journals. In late 1932 (Oct I think but see "The 1932 Ford Book" if you need the exact date) counterweights were cast onto the crank. There was also a crank with pressed on weights that you are probably calling the BB crankshaft. I have heard a couple of stories on these ranging from Big Trucks to additions at a later time by Ford authorized rebuilders. See Vince Falter's site
http://www.fordgarage.com/ for further details and photos.

Charlie Stephens

Kohnke Rebabbitting · 07-01-2012, 10:58 PM

Quote:

Originally Posted by Charlie Stephens

The first Model B crankshaft looked like a Model A crankshaft except bigger journals. In late 1932 (Oct I think but see "The 1932 Ford Book" if you need the exact date) counterweights were cast onto the crank. There was also a crank with pressed on weights that you are probably calling the BB crankshaft. I have heard a couple of stories on these ranging from Big Trucks to additions at a later time by Ford authorized rebuilders. See Vince Falter's site
http://www.fordgarage.com/ for further details and photos.

Charlie Stephens

The weights were not pressed on, they were shrunk on, big difference!

columbiA · 07-01-2012, 11:45 PM

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The one disadvantage to the shrunk on C-weights on the mid 30,s Ford rebuilds for trucks was that they were about twice as wide as the standard 33-up weights & had to be removed when the crank pins needed regrinding.Other than that,they provided even better balance than the standard C-B shaft.

07-01-2012, 03:26 PM	#1
glenn in camino Senior Member Join Date: May 2010 Location: Camino, CA. Posts: 3,086	Model B and BB crankshafts What is the difference between a B crankshaft and a double B crankshaft?

07-01-2012, 04:00 PM	#2
Charlie Stephens Senior Member Join Date: May 2010 Location: Southern California Posts: 7,031	Re: Model B and BB crankshafts The first Model B crankshaft looked like a Model A crankshaft except bigger journals. In late 1932 (Oct I think but see "The 1932 Ford Book" if you need the exact date) counterweights were cast onto the crank. There was also a crank with pressed on weights that you are probably calling the BB crankshaft. I have heard a couple of stories on these ranging from Big Trucks to additions at a later time by Ford authorized rebuilders. See Vince Falter's site http://www.fordgarage.com/ for further details and photos. Charlie Stephens

07-01-2012, 11:45 PM	#4
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: Model B and BB crankshafts Sponsored Links (Register now to hide all advertisements) The one disadvantage to the shrunk on C-weights on the mid 30,s Ford rebuilds for trucks was that they were about twice as wide as the standard 33-up weights & had to be removed when the crank pins needed regrinding.Other than that,they provided even better balance than the standard C-B shaft.