Originally Posted by
Old Tech
I'm not so sure about 64p being more efficient than 48p. I agree with Geezatec, there is more surface area in contact between your pinion and spur with 64p compared to 48p, which is why it runs quieter. The primary advantage is the ability to get finer gear ratio selectivity. This is more important when running foams where tire diameters vary so greatly compared to rubber tires. I think 64p has its greatest benefit in 12th scale racing.
It has been said already. Being quiet is a sign of efficiency even if only you look at noise as energy being wasted.
But that is just a perk on the side. The higher contact area and the closer mesh allowed are the reasons behind higher efficiency of the 64 pitch.
Xrays don't allow 64 pitch unless you modify your spurs to allow access to the motor screw. Not sure about all of them but 007 is like that. You also need to modify the spur holder if you can't get spurs with six holes.
And yes, I am in the 64 camp.