[Steve C.]

"Mean and maximum piston speeds are still valuable calculations for any engine builder making a change to a proven formula. Exceeding 5,000 fpm in mean piston speed should get your attention and prompt rethinking on parts selection. Excessive piston speed can lead to inconsistent lubrication of the cylinder wall, and in some situations the piston will actually accelerate faster than the flame front during combustion. While the former can cause parts failure, the latter is lost horsepower."

https://blog.k1technologies.com/stok...ngle-explained


"With further increase in mean piston speed, the maximum power output and the power output at maximum thermal efficiency decreases."

https://www.sciencedirect.com/scienc...piston%20speed.


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