Ford Small-Block Stroker Engine Build - Stroker Strategies
From the diagram on the right, you can see that for any given stroke length, the rod angularity quickly increases as the rod length is shortened. As the piston travels down the bore, the gas pressure not only acts on the crank to turn it, but a component of that force also pushes the piston into the side of the bore. The greater the rod angularity, the greater the side loading and the frictional loss stemming from it.
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