What kind of electric motor has around 20 hp and runs on a car battery?
We want to build a go card and should build it with an electric motor but we can't find one that doesn't cost that much and can be powered by a car battery and is also as waterproof as possible
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What kind of car battery? Such a 100Ah starter battery supplies a cold start current in the range 600A at then still 10V. If 6 kW, at least theoretically as a virtually short-circuit current, which is tolerated by load, and starter batteries also find a load only so medium-precision (at least 6C discharge rate, half would already be an indication for continuous operation).
Even the Cityels of the past have only recovered 2.5 kW from three 95Ah lead traction batteries at 36V.
3.5 kW when the voltage has risen to 48V.
Long DC motors, eg Perm PMS 120W, reach 13 kW at 96V battery voltage and 150A current. You need 8 starter batteries to feed the 100Ah series.
At BLDC the Golden Motor Thingsr reaches its 10kW also at 48V, but just 280V battery power, since it should be more than 200Ah of lead batteries, and then 4 in series.
This is not really sensitive for go-karts, because only the batteries here bring 200kg weight to the scale. Then ask if it really needs to be 20 hp.
At 12V, the power limit is somewhere at 1.5-2.0 kW.
Look at the modeling area. There are also motors in the kilowatt range for larger racing bands. Especially for the planes. There was also the appropriate controller.
E-Bike or electric scooter motors are often cheaply available and designed for 12V or 24V, making them compatible with car batteries. If it is not completely waterproof you can still make a spray water-protected housing.
A windshield wiper engine is relatively strong and you have to build a gear and then go.