i heard you can put a beeper's motor that it uses to vibrate in a care, is it any good. it seems like it would have more power because it has to spin that wieght around.
check out www.questformadness.com They have a mod on using Beeper motors on your bit. I would think that the beeper motor would be the equivalent to a 1.4 - 1.6, but im not sure... I dont think it would be very fast considering it wasnt designed for actually moving little r/c's, but its worth a shot.