brushed turns and gearing

[Lone-wolf]

Sorry to be a right royal pain in the seat

 

 So lets take a 550 size 15T brushed with 17 tooth pinion.....and lets take a 550 21t with 19 tooth pinion, would the 21t motor be more efficient and run cooler than the first set up, just trying to get things int some order

[Tug]

Sounds about right, but I've not dabbled in brushed for years. Hopefully someone else will confirm. 

[Garry]

On 24/07/2020 at 18:41, Jack Reacher said:

Sorry to be a right royal pain in the seat

 

 So lets take a 550 size 15T brushed with 17 tooth pinion.....and lets take a 550 21t with 19 tooth pinion, would the 21t motor be more efficient and run cooler than the first set up, just trying to get things int some order

 

 

Kinda. On a purely temperature level, yes - with caveats.  The 21t motor will be considerably slower despite being gear slightly higher. So  you might find yourself thrashing it to its limits to give similar performance   which counteracts the point of picking a slower motor gear higher. All other thing being equal then its about where the peak power is achieved.

 

Basically the performance difference between those two motor is larger than these two pinion sizes. A slow motor geared higher will be less efficient than a fast motor closer to its ideal powerband.

Think Ford Fiesta in 5th gear vs  Ford Focus RS in 3rd gear.