16skyline

Hi come someone explain what the differance between a .21 off road motor to a .21 onroad motor?

Thanks

NitroOB4You

iTrader: (36)

I'm certainly no expert, but generally speaking offroad engines are designed to idle well and provide good throttle response in the low to mid revs whereas onroad engines are designed more to handle stresses created from running mostly high RPMs. Offroad heads need to be bigger also, due to constant throttle flucuation. My .02

Colt4g63

iTrader: (8)

Port timing and the RPM range they run in. On road engines are designed for higher output but at a higher RPM and not really suitable for off road use in a buggy or truggy.