Yes, the same force against a longer lever will equal more torque. However, if we expand the expression we have:
1) Cylinder Pressure x Piston Cross Sectional Area x Stroke / 2 = Torque.
From 1) we see that increasing the stroke or increasing the piston cross sectional area has the same effect on torque. Since we are dealing with a heat engine simply increasing a dimension, by itself, cannot result in increased engine output. That would be akin to getting something for nothing which, cannot be. Engine output must be proportional to heat input.
In fact, increasing the bore size and/or the stroke increases engine displacement. The increased displacement results in a greater volume of air/fuel mixture inducted into the cylinder during each intake stroke. The greater volume of air/fuel mixture provides the increase in heat input to maintain the cylinder pressure.
If we compare engines of equal displacement, increasing the stroke requires a off setting reduction in piston cross area. For any given cylinder pressure, torque is not increased due the decrease in force output from the smaller piston. I provided an example of this in my 9/26 post.
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