R/C car engines are not run like we run our engines. They need them to rev quicker and higher, and for short bursts of power, then off the gas for the corner. Too much oil makes the engine lag. If the engine and carb are set up correctly, a car engine can last a long time, and when they do wear out it is usually the rods. It really is an apples to oranges comparison when pitting stunt engines to R/C car engines. The closest thing to our stunt run in an R/C engine is the helicopter engines as far as where they want the power and how they run them. The 3-D spend more time at the peak of the power band but your plain joe pilot heli flyer needs his power in the mid to upper mid range.
Type at you later,
Dan McEntee