It should be noted that the reason we have not seen a rotary win another LeMans since the race in the early 90's is that the LeMans race organizers changed the rules after that race to prohibit rotaries from running in the race. How convenient for their piston engines ...
Similar to the way the Indy 500 organizers changes the rules to prevent turbines from running at Indy after Parnelli Jones' car beat all of the piston cars easily for 197 out of 200 laps (he had lapped the entire field by then), and failed to win only because a minor bearing broke. The piston folks simply legislate away the competition ...