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      09-27-2013, 06:23 AM   #73
mkoesel
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Drives: No BMW for now
Join Date: Jun 2006
Location: Canton, MI

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And speaking of people commenting through other channels, a knowledgeable forum member sent me this regarding the earlier discussion about the relationship between stroke length and torque:

Quote:
Anyhow, regarding torque and stroke, it is a common misconception that for a given displacement, a longer stroke will yield more torque. With a bigger bore, there is greater surface area for the cylinder pressure to work on and provide a greater pushing force. Torque produced by a piston is defined by the following formula:

T = P x (B/2)^2 x pi x S/2 x sin(Teta)
Where:
T=Torque
P=Cylinder pressure
B=Bore
S=Stroke
Tetal=Crank angle with Teta=0 at TDC