>torque = cylinder filling.
not quite, torque is proportional to cylinder air trapping, how much air
is in the cylinder when at IVC, thats not the same as filling.
one of the great things about computer based finite amplitude wave
simulators is that you get to really change just one thing and see what
difference it makes in terms of torque and HP curve and pressures in
intake, cylinder, exhaust and intake and exhaust relative mach indexes.
From that I can say that bore to stroke ratio has little effect on the
torque curve, but when you build real engines and change stroke you
almost always change the stroke to rod ratio, that has a very real effect
on torque curve because it changes peak piston velocity and where it is
reached, that changes peak port velocity and how the valves should be
timed.
as for the long stroke being a low speed motor, I point to the new K24
motors from Honda (current Accords, CR-V and Element). 2.4 L 100mm
stroke 86mm bore, not very square, but they rev as freely as the engines
they replaced (more so in the case of the Accord).
Chris Hall
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