At the end of the 2006 competition season, both NASCAR Cup and FIA Formula One engines had reached pinnacles of crankshaft speed for their respective classes of motorsport: 10,000 and 20,000 RPM respectively. Although operating at these RPM levels has since been outmoded by regulation (NASCAR’s ever more stringent use of its ‘gear rule’ and the FIA’s 19,000 RPM rev limit introduced in 2007, reduced to 18,000 RPM for 2009), it seemed interesting to compare these very different engines to see what, if any, areas of commonality might exist.
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