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Old 02-09-2008, 08:50 PM   #1
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Default Gear ratio question!

For example
88 spur and 44 pinion = 2.00 gear ratio.
78 spur and 39 pinion = 2.00 gear ratio.
Is there any advantage to have a larger pinion or smaller pinion to achieve the same gear ratio? I am wondering if the motor has more torque or lower opperating temps one way or the other.

Thank you

Last edited by Horth Racing; 02-10-2008 at 08:36 AM.
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Old 02-10-2008, 12:29 AM   #2
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Larger spur & pinion will transfer the power more efficiently because less thrust is being generated as the teeth meet eachother at a more similar angle. Also each tooth is being used a less percentage of time for a given rotation further reducing stress. The smaller spur & pinion combo has less rotational mass and moment of inertia. It's a give & take situation. It seems the larger gears are preferred...
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Old 02-10-2008, 08:35 AM   #3
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Thank you for your insite!
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