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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