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Jack Shaft · 01-24-2021, 12:09 PM

Ford engineering identified a number of improvements during the A's run. Ford decided to incorporate them all at one time with the 'New and Improved' 4 cylinder engine.

Larger crankshaft journals, and ultimately a counterbalanced crankshaft in late '32

positive oil flow to main bearings

redesigned cam shaft builds torque to 2900 rpm

mechanical advance distributor

larger carburetor with side mounted float

redesigned exhaust manifold

redesigned head (4.6 to 1 compression) and combustion chamber

redesigned water pump

and a number of other improvements

The crankshaft redesign and ultimately counterbalancing along with the mechanical advance distributor greatly decreased main bearing failure. The engine developed 25% more horsepower and the torque band was raised to 2900 rpm. Given 5 years of observation this is what Ford engineering did to improve the model A engine..

The truck engine you are buying probably has a BB crankshaft with pressed on counterweights, these have to be removed to grind the rod journals, people often walk away from that crankshaft if it needs machining .B engines do crack, primarily from 2and 3 exhaust valve to the cylinder. Pinning the crack, installing exhaust seats and cylinder sleeves cures the issue.

01-24-2021, 12:09 PM	#14
Jack Shaft BANNED Join Date: Dec 2019 Posts: 1,196	Re: 32 model b engine Ford engineering identified a number of improvements during the A's run. Ford decided to incorporate them all at one time with the 'New and Improved' 4 cylinder engine. Larger crankshaft journals, and ultimately a counterbalanced crankshaft in late '32 positive oil flow to main bearings redesigned cam shaft builds torque to 2900 rpm mechanical advance distributor larger carburetor with side mounted float redesigned exhaust manifold redesigned head (4.6 to 1 compression) and combustion chamber redesigned water pump and a number of other improvements The crankshaft redesign and ultimately counterbalancing along with the mechanical advance distributor greatly decreased main bearing failure. The engine developed 25% more horsepower and the torque band was raised to 2900 rpm. Given 5 years of observation this is what Ford engineering did to improve the model A engine.. The truck engine you are buying probably has a BB crankshaft with pressed on counterweights, these have to be removed to grind the rod journals, people often walk away from that crankshaft if it needs machining .B engines do crack, primarily from 2and 3 exhaust valve to the cylinder. Pinning the crack, installing exhaust seats and cylinder sleeves cures the issue.