Quote:
Originally Posted by MTBikerTim
My 2c on the first question. The 8000 will be faster as it will be more powerful as it will have a lower resistance and use more power and in a perfect world produce more power in theory. In practice with other factors the lower kv motors can be faster. The higher KV motors often can't produce the torque to reach their theoretical max rpm due to heat and current requirements.
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Not exactly. Most motors from a given manufacturer, of the same series, but different kv ratings produce equal torque if all else is equal also. The difference comes because of the limits of the motors. For example; Mamba Max motors all have the same max rpm, lets say 60,000. To get a motor to that rpm, a certain amount of voltage would have to be applied. To find out how much voltage you need, take the rpm and divide it by the motor's rating. To get the lower kv rated motor to the same 60,000 rpm, it would take a higher voltage. With current being equal in both systems, the higher voltage system makes more watts of power, since watts are voltage * current. They both will be spinning 60,000 rpm (making neither motor faster), but the higher voltage system will have more horsepower. The higher horsepower system can pull a bigger gear, and thus go faster.
Voltage * Current = Watts
745.6 Watts = 1 HP
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