Wade, I fiind it hard to believe rpm has anything to do with why you are making more power and that efficiency could be accurately measured to indicate such.
HP = Work over time. HP = BTU HP is calculated from Torque and RPM.
1000hp using 85 gallons an hour at 75 theoretical percent efficiency( very short/slow burst low heat rejection time ).
1000hp using 79 gallons an hour at 82 theoretical percent efficiency ( same short use burst with low heat rejection ) would be a 10 percent increase in engine efficiency.
The only benifit I see with higher rpm is torque multiplication with gearing. Mainly time with the great amount of torque.
Let's just say that 22 percent ( total ) effiencent engine is now raised to 24.2 percent total, that is a huge improvement but still hardly measureable in the 1/8th mile.
Edit: I'm probably looking at the whole picture wrong. The way less amount of fuel I presume at higher rpm's is probably the lack of total hp at the higher rpms. 1000hp at 3500 rpm has a negligable difference for BTU's of fuel in my perception than 1000hp at 6500rpm. So the way I see it having equal hp between to different engines, it takes the 6500 rpm and lower gearing to do the same work the 3500rpm can do with higher gearing. My question should be, what is the torque curve and does the higher rpm afford more time in that torque curve considering the lower gears.... I think I'd rather spend my million dollars on a transmission that never shifts and can keep my engine at a near sustained rpm while still drastically increasing transmission output rpm under tremendous load.
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