motor springs?

[chizzler]

1. which side of the motor needs more tension?
-or does it not matter?

2. what do the different tensions of springs do for the brushes and motor?

like, does a tighter tension on a brush on a bumpier/jumpier area would more likely keep the brush in good contact with the comm, and a lighter tension would be more for straightaway/flat type surfaces, where it would have less chances of shifting, thus not ruining comm/brush/motor?

thanks :D

[Grizzbob]

Well, I'd say you're on the right track, though the springs also have an impact on the motor's torque & rpm output. In general, a stiffer spring improves the conductivity of the brush/comm interface(for more torque & power), but at the cost of more friction which can restrict rpm & the other numbers if it's too much), & a lighter spring can reduce friction, allowig for better rpm(speed) but at the cost of the torque & power output(if you go too far). Also, more friction will increase the motor's amp draw, which in certain forms of racing could become a problem(like 1/12 scale 8 minute races), so you shoot for a balance of spring tension to get the most of everything(but it's always a compromise). That IMO, is part of why you see stock motors using a greater variety of springs, they need all the power they can get, while mods tend to use a somewhat soft spring(to a point) to maximize efficiency. Now, for using different springs on each side, popular wisdom suggests that the stiffer spring should go on the positive side, & the softer one on negative(but I don't really understand how they came to that conclusion), & from my testing with Trinity's polarized spring & brush set up, it does seem to offer a good balance of everything, good rpm & torque, with the best power numbers..... :)

[chizzler]

thanks grizzbob,
your right about the trinity springs, and that why i needed to know why it mattered because of the various varieties. i had gone out and bought most of their different spring rates, but then i was dumbfounded as to why some spring weights were mixed: like 13 and 11's, and why/when they needed to be used. Thanks, not even my lhs knew the answer.. :)(kinda sad, but they seem to do a lot of nitro)