low end torque vs long stroke, was: 413 vs 440!
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low end torque vs long stroke, was: 413 vs 440!



Maybe it's too obvious to point out, but no one has yet mentioned that long
stroke means that the lever arm length through which the crank twists the
driveline is 1/2 the stroke, so an engine with 10% longer stroke, all other
things being equal, will have a 10% higher torque rating.

Dick Benjamin
----- Original Message -----
From: D. Dardalis <dardal@xxxxxxxxxxxxxxx>

>All these real early engines
> had a high stroke/bore ratio (more than 1.2, 1.3?).  Also, they had a lot
> of low end torque, by modern standards.

 >However, the very strong low end is NOT really a direct result of
> the long stroke (although there is some relationship between the two that
> becomes important in high compression engines, like diesels, won't get
into
> why).  The low end torque of these old engines was more related to the
very
> small cams with almost zero overlap, tiny intake valves and ports
(compared
> to later engines), small carburetors and narrow intake manifolds.




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