Cooling vs pinion gear size

[jk6672]

How does going down one tooth in a pinion gear help coolinig the motor?

 

[WoodiE]

The larger pinion causes the motor to have to work harder, just changing one tooth can and does make a difference in the final gear ratio.

Typically remember this when gearing:
Small pinion and big spur = more torque, less top end, but lower temps
Big pinion and small spur = less torque, more top end, but higher temps

 

[abadk9420]

What he said^^^

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[jk6672]

I understand the gearing aspect, but the cooling of the motor threw me off. The motor will spin at the same revolutions regardless of the land speed using the same about of volts/amps correct?

 

[abadk9420]

The motor will not have to work as hard or will put less load on the motor with a smaller pinion/larger spur gear this making the motor run cooler .

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[beason]

just think of you on a bike. if you are geared low, you can pedal along with minimal effort.

slap that baby in high gear, and you are huffing and puffing to get going. motor does the same thing.

 

[WoodiE]

just think of you on a bike. if you are geared low, you can pedal along with minimal effort.

slap that baby in high gear, and you are huffing and puffing to get going. motor does the same thing.

This exactly. You're essentially putting the load on the motor with a larger pinion vs a small pinion.

 

[Rolex]

just think of you on a bike. if you are geared low, you can pedal along with minimal effort.

slap that baby in high gear, and you are huffing and puffing to get going. motor does the same thing.

That's correct. On a bike, YOU are the motive force, and YOU will overheat.