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I can see where USAC is trying to go with the concept of limiting RPMS. They comissioned Ilmor to perform dynamic analysis of the typical midget engine setups. This most likely included an analysis of modal performance (i.e. vibrations & harmonics) as well as strength/materials analysis given the engine operating at various RPMS. The numbers presented were probably the ranges with the best compromise of power vs. reliability. In other words, perhaps 8,700rpm for a pushrod engine hurts the HP/TQ, but yields gains in the modal performance department. Less vibration due to operating within an RPM range that does not contribute to harmonics would significantly increase the life of an engine. Apply the same concept to strength/materials of the engine components...you see where this is going.
Having said that, I like the eco-tech....bring it on.
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