The IMI race is like the other RMax races so far. They are club races with the RMax added to the program. The RMax classes will be run to RMax rules including fixed gear. It won’t hurt the mini engines one bit to run at max rpm as it is so far below what the engine is capable of it won’t hurt them.
After waht we ran a senior engine at in SoCal early this year, I have no doubt about how sturdy these engines are. We ran one at 14,000+ rpm for long periods of time (much longer straight that IMI) Temps were well over 100 and the engine was running at 205 deg F. It ran all day with no problems.