Hi Bill,
I don't know if this helps or not.
It's all about inertia. More mass requires more power/time to change speeds.
in a car with a 3.5 to 1 first gear & a 4 to 1 axle, in first gear,
there is a 14 to 1 mechanical advantage for the engine to accelerate the
car mass. Thus the engine/flywheel only has to overcome 1/14th of the
total car mass. In top gear the engine/ flywheel has to overcome 1/4 of
the total mass.
Bottom line, for a given car weight, a light flywheel improves
acceleration in proportion to the gear tht the car is in. Much more
improvement in first gear than in top gear. And of course much faster
throttle response when the clutch is not engaged.
My personal experience with a BN2 is that a 13 lb flywheel vs the
original 40 lb makes the engine/car more responsive in the lower gears &
between gears. On this very long stroke engine, it has no noticeable
effect on idle quality, engine starting, or ease of getting the car
rolling from a stop.
Regards,
Dave Russell
BN2
Bill wrote:
> Hi Greg,
>
> While I'm sure there are many others out there much more versed in
> physics than I am, the "#" sign means pounds, as in weight. It takes
> more horsepower and time to spin up 42 pounds than it does 23
> pounds. That means quicker acceleration and deceleration. I can
> easily tell you the results, just not necessarily why. Would
> somebody please help me out here?
>
> Many thanks,
>
> Bill Barnett '53 BN1 # 663
>
> Go2ghill@aol.com wrote:
>
> > What at the numbers for the fly wheels mean, and why is one better
> > than another. Greg BN4
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