[Walter Deitzler]

Originally Posted by jafisher

The number of CIMs doesn't effect the speed because the motors still turn at the same rate. With only 1 CIM on each side you'll have less torque and pushing power though.

Same amount of torque (in the same way there is the same amount of speed), but there is less power. What will happen is your motors will stall out quicker, due to taking a bigger load (not split between two motors), or you will trip your breaker. Also, you have slower acceleration. We have done it, but with a high torque gearbox, and not much pushing. Video here:http://www.youtube.com/watch?v=gI2htgElMKE

If you get into a pushing match, you are more likely to stall your motors or trip a breaker, thus downing you the entire match.

tl.dr: Yes it can be done, but not advisable.