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  • Motor Differences

    Hi,
    found this very useful for my research - not sure if it has been posted before, but might help someone :

    SCX Motor Reference Guide.

    This is a quick explanation of some of the names of SCX slot car motors.

    Using the RX-41 and RX-42B as examples.

    The first number 4 stands for the armature length and also refers to where the pinion gear is mounted. So a motor with a 4 is a 50mm shaft with a 9-tooth pinion gear mounted on the rear of the armature.

    The next number refers to whether the motor is meant to be used with a motor pod or not. A 1 means the motor is made to be used with NO motor pod and a 2 means the motor is to be used with a motor pod. If there is no second number then the motor uses wires instead of the standard metal legs to make contact with the guide.

    The letter or lack of a letter after the numbers refers to the motors rpm.

    Motors with a A or no letter at the end are rated at 16400 rpm.(RX-41,RX-42) Motors with a B are rated at 18000 rpm. (RX-41B,RX-42B) Motors with a C are rated at 19000 rpm. Motors with a D are rated at 19000 rpm.(including Pro motors) Motors with a E are rated at 22000 rpm. Motors with a F are rated at 25000 rpm. Motors with a G are rated at 21000 rpm. Motors with a H are rated at 25000rpm.

    So a RX-41 is a 50mm shaft with a rear 9 tooth pinion gear made for a non motor pod chassis rated at 16400rpm and a RX-42B is a 50mm shaft with a rear 9 tooth pinion gear made for a motor pod chassis rated at 18000rpm.

  • #2
    Originally posted by hepkat63 View Post
    Hi,
    found this very useful for my research - not sure if it has been posted before, but might help someone :

    SCX Motor Reference Guide.

    This is a quick explanation of some of the names of SCX slot car motors.

    Using the RX-41 and RX-42B as examples.

    The first number 4 stands for the armature length and also refers to where the pinion gear is mounted. So a motor with a 4 is a 50mm shaft with a 9-tooth pinion gear mounted on the rear of the armature.

    The next number refers to whether the motor is meant to be used with a motor pod or not. A 1 means the motor is made to be used with NO motor pod and a 2 means the motor is to be used with a motor pod. If there is no second number then the motor uses wires instead of the standard metal legs to make contact with the guide.

    The letter or lack of a letter after the numbers refers to the motors rpm.

    Motors with a A or no letter at the end are rated at 16400 rpm.(RX-41,RX-42) Motors with a B are rated at 18000 rpm. (RX-41B,RX-42B) Motors with a C are rated at 19000 rpm. Motors with a D are rated at 19000 rpm.(including Pro motors) Motors with a E are rated at 22000 rpm. Motors with a F are rated at 25000 rpm. Motors with a G are rated at 21000 rpm. Motors with a H are rated at 25000rpm.

    So a RX-41 is a 50mm shaft with a rear 9 tooth pinion gear made for a non motor pod chassis rated at 16400rpm and a RX-42B is a 50mm shaft with a rear 9 tooth pinion gear made for a motor pod chassis rated at 18000rpm.
    I have an RK-42 in my Mercedes SLS. What does RK stand for? The motor runs good and seems to have better fuel efficiency over the RX motors. Does anyone have any information for me? Thanks!

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