TeamThibault

whats the dif.... if i use a smaller spur (80) 40 pinion vs 96 spur 48 pinion?

ThePanda

iTrader: (68)

there was a thread about this a while back. same ratio, different sizes. i think it was concluded the biggest difference was weight distrubution. by having the motor moving. so on a car like a 2wd buggy yiu could adjust traction, stuff like that.

MarkA

iTrader: (21)

Since they both equal a 2.0 ratio, the smaller gears will move the motor foward or back in the car depending on what car you're talking about so it can be a minor weight bias adjustment. As well, the larger gears could theoreticaly act as a larger lever leading to what some will say is an increase in punch but that's not something I can say I've noticed in the real world.

neospud

I don't know about about that leverage comment... seems a little out there. A small pinion gear with a large spur gear is leverage and both have a "2:1" ratio. The main difference will be rotational inertia and mass.

asc6000

iTrader: (15)

it would be leverage from the center of the motor shaft to the contact point of the teeth, so it's leverage in the sense of how much resistance the drivetrain and mass have over the power of the motor. smaller gears smaller lever quicker accel (essentially geared down), goes hand in hand with the less pinion mass too. The only time you would notice would be real low power situations under exacting conditions. More like an old school 12th scale thing. 4 cell nicad w/ a brushed motor you looked for every little thing. I doubt few people in the world could tell any difference with todays power in off road.

Dave H

Any supposed increase in leverage from a larger spur gear will be eliminated by the opposite effect of the larger pinion gear, for for the same gear ratio.

neospud

Yeah lol... wasn't gonna say anything glad you did.