The picture of the Mugen MT-12 shown above proves a point here, how did it broke? Well, heat failure?, bad conrod?, too lean of a mixture? It all points to the same direction: either bad craftmanship, user's bad tuning, heat stress or bad gas It's all in the variables. Personally, I have yet to see an engine that runs reliably for 35 minutes at 300 + temperatures and lives to see the track another day.

Sure, I can race any engines at those temperatures if somebody else is paying for them at the end of the race (if it even finish it)