All slot cars consist of a body which is often a solid molded piece of plastic which fits on the superior chassis. The car's weight and distribution of that weight are of primary consideration when coming up with and building a slot motor.Each car usually has an interior portion which is attached to the body too. Each car will have an electric motor placed either in in its middle, front or rear end. Racing car motors are rated as per the number of RPMs (revolutions per minute) they design. This ...