quote:Originally posted by kenI am now using a LRP quantum reverse ESC(16T-36T), but have yet change the kit motor as I am confused on the types of motor out there(stock, modified,rebuildable stock??)[?][?]
can someone give me some "lectures" on the differences of these motor?[]
id="quote">id="quote">I'll try not to lecture!
The kit Tamiya motor (gold 540) was developed into two types of motor, the 'stock' and the 'modified'.
The so called stock motor now has 27 turns of a single wind around each of it's 3 poles. It still uses bushes but has replaceable brushes and has a fixed end-bell. In 1999 Trinity produced the Paradox, which was the first 're-buildable' stock. The end bell can be removed and so the armature can be taken out and skimmed to restore the comm for maximum performance. Both of these motors have the timing fixed at 24 degrees of advance. This is a heck of a lot of advance and gives the motor lots of rpm, at the expense of efficiency. Since we have 2400, 3000 and 3300 cells, so what! Well the poor motor gets very hot and it's life can be brief if over-geared!
The 'modified' motor has ball races instead of bushes, and the end bell is adjustable to change the timing. The rules allow the armature to be wound with any number of turns, 12, 13, 19 etc. Winds vary and you will see singles, doubles, triples etc. The most popular are the doubles, as they give a good combination of torque versus rpm. As a rule of thumb, a triple will rev higher but have less torque than a double of the same wind. Medium winds, like 15 to 19, give significantly improved output over the kit motor, and as long as you keep the timing advance at a small amount (probably just as it came) they will give long life and good run times, if geared properly.
If you go to the extremes, then you are trying to get more and more out of the same size brush/commutator/case. Something has to give and it is usually reliability!
If you want your Tamiya to go a good bit quicker and not break the bank, look out for the mid priced modifieds like the Orion Orbital series. The armature is usually machine wound and they won't have the very latest in magnet technology, but that will make little difference. They will last longer and cost nearly half the price of the top of the range motor. They are also longer lasting than re-buildable stock motors, and a good bit faster. They will make the car a bit exciting to drive though!
The rebuildable stock is a great concept and I like them a lot. I have raced them indoors and out and have learned how to make them last. They do need a fair bit of TLC and will not take kindly to abuse. They are really intended for racer's who use them because they have to. If you are not running in competition, their only advantage is the low initial cost.
Enough for this post. If you want any more, just ask!