I got a few XL power functions motors, and want to combine them to make a racing car. Let's get to right to the question:

Which one save the most torque power? This one... enter image description here

...or this one?

enter image description here

PS: It is okay if you warn me that even with three XL motors, the car won't work.

  • I assume that the first one is less likely to damage the 8-tooth gears, if that's a possibility, which it probably isn't. Dec 17, 2019 at 16:33

1 Answer 1


The torque in both versions would be the same.

Your first version just adds 3 of these gears:

gear 3648

The ratio between them is 1:1 so it will be the same as if you connect the axle straight into those small gears, as you do in the second image.

(Well, technically speaking, having 3 more gears in the mix will sacrifice some power to friction, but the theory is the same.)

Note, this answer assumes you aren't also running an axle through both these gears in your first image.

gear 3648 gear 3649

If you are, then it simply will not work.

  • Thank you so much! That was exactly what I was looking for :)
    – Kimatuy
    Jan 27, 2017 at 13:39

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