Originally Posted by blis

Perhaps there's something to be said about the racer in this matter. A good racing buddy of mine is a modified RB runner, the engine is remarkable, having said this..

As too is his attention to detail on all other aspects of his car, it's not the average "Joe" that would invest in an modified engine of this calibre so free roll of a chassis and rotating mass and inertia comes into play. Attention to bearings, altitude above sea level, car setup, clutch slip, tyre slip all equate to power to ground and overall fuel efficiency.

He gave me an "old" one made from old spare parts, after replacing rear bearing and O-rings the old Murnan RB still rocks for it's age and all I can say is ... they are AWESOME ENGINES!!!