Gentlemen, an interesting discussion. I gather that Keith Williams contends that leakage, if any, by piston rings will cause a decrease in IHP. 411A and Ferrydude seem to contend that TCM data does not support this.
Is there an academic type of explanation of why you may have some blow by of piston rings yet not decrease IHP? I find Keith's explanations quite convincing....
Separately Keith, have you ever written a book or published papers/articles on aerodynamics/performance/engines etc?