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I was thinking that a lot of the gain would come from reduced friction by removing 2 pistons.....you also reduce pumping loss and a bigger cylinder is more efficient due to a better surface area/volume ratio in the combustion chanber. As you increase cylinder capacity area increases with the square of dimentions, and volume with the cube. heat conducted away from the hot gases is proportional to area.
this heat loss is one of the factors that limits low RPM efficiency.
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