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Old 01-24-2008 | 11:38 AM
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DarZeelon
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From: Rosh-HaAyin, ISRAEL
Default RE: LONG stroke vs. SHORT stroke (?????)

TFF,


You are senselessly repeating yourself.

The side forces applied by the piston on the sleeve are a function of the 'con-rod length to stroke ratio'.

They are completely non-dependent on the stroke to bore ratio.


Two engines of equal displacement, working at the same brake-mean-effective-pressure, will make the same torque, even if one is an extreme long-stroke design and the other an extreme short-stroke design.

Even the side-forces resulting from the 'con-rod length to stroke ratio', which you so heavily emphasize, are minuscule when compared to the explosive force provided by combustion.

...And this item in both engine would be equal, if they are running at the same BMEP (a function of the engine's volumetric efficiency - VE).

In reality, the big torquers are over-square engines, mainly because they allow larger valves (in four-strokes), or larger ports (in two-strokes).


Saying otherwise would be 'barking up the wrong tree'...