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Rod To Stroke Ratio <br/ >The rod/stroke ratio is B divided by half of A, as indicated in the drawing. The shorter the rod, the more the piston loads the lefthand side of the bore on the power stroke. If the piston and ring package had zero friction, this would not be a problem, but since it does, this makes a longer rod (up to a point) a better deal, as friction losses are lower.
Engine Masters Challenge - The Power To Win!

 Rod To Stroke Ratio
The rod/stroke ratio is B divided by half of A, as indicated in the drawing. The shorter the rod, the more the piston loads the lefthand side of the bore on the power stroke. If the piston and ring package had zero friction, this would not be a problem, but since it does, this makes a longer rod (up to a point) a better deal, as friction losses are lower.  View Related Article

 

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