Blake,
Thanks for the equations -- very interesting. However, the formula for piston
velocity has a missing right parenthesis. I assume it should be after the sin
2a???
I would also be interested in the source of these equations, if you would care
to
share it.
Thanks,
Bill Dudley
67 MGB
Bullwinkle wrote
> <<<snip>>>
>
> I found two formulas for finding piston velocity both when the
> piston and crankshaft lie in the same plane. If they are not,
> then there are different formulas
>
> The first formula is too difficult to render in typed notation.
> The second is a simplified but approximate formaula.
>
> piston velocity= v(sin a + r sin 2a/2l
>
> Where v is crankpin velocity, a is the crank angle, r is crank
> radius (1/2 the stroke) , and l is the length of the connecting
> rod (center to center).
>
> v, the crankpin velocity, is dependent on the engine rpm and the
> crankpin throw.
>
> *************************
>
> The mean piston speed at N r.p.m.,
>
> V (ft./sec.)=(2S/12)(N/60) wher S=the stroke in inches.
>
> **************************
> I found the following mean piston speeds:
>
> MGC: 3060 ft/min at max power (5250 rpm) (1967 Autocar test)
> MGB: 3150 ft/min at max power (5400 rpm) (1962 Autocar test)
>
> Blake
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