Take the same cylinder heads, induction, exhaust cam etc from a low rpm, long stroke engine . And change the short block for a large bore, short stroke unit of IDENTICAL displacement. HP and torque will be identical along with slower piston speed. Why does a short stroke large bore engine get used in a high rpm application? The small bore engine does not have room for large valves and large dia ports to feed a engine making high HP. The small bore engine's small ports they choke off high rpm flow. The small bore engine since it can't breath at high rpms . It's equipped with a short duration cam which builds low end torque and further chokes off high rpm power. Compression is kept a little lower to limit compression pressure and detonation. The large bore, short stroke engine with the larger ports and valves which can provide flow a higher rpms. The engine is cammed with an longer duration cam and higher compression . Which makes higher mid range torque and top end power.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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