Stock Motors

[julesbristol]

What exactly is a stock motor? Is it for beginners? Is it slow or fast?

[El Mexican]

Good question. Why exactly do we call them "stock" motors? Maybe its because in the old days you couldnt change the timing, brushes, etc. on these things whereas with modifieds you can easily open the can and tinker with everything in it?

Someone here is bound to know more...

[Gruntfuggly]

That's exactly why - it's the same as 'Stock Car Racing', ie, you using something that could come from a shop's stock (eg, a car, or in this case a motor)...

[jozza]

The idea of a stock motor is that it makes for fair competition within a certain price/performance limit.

A stock motor will be a 27 turn with fixed timing (24 degrees I think), bushings instead of ball bearings and there are rules on how the motor can be manufactured. There are rebuildable and non rebuildable ones and they are covered by bodies like the BRCA in the UK. In the UK, for competition stock motors there is a price ceiling of about £30

Performance and speed varies. There are stock motors made for different purposes, for instance the Trinity Monster stock will be faster than a Trinity P2K2, which has more torque. You can also change the brushes and brush springs in a competition stock motor to affect the speed and torque of the motor.

Competition stock motors will always outperform the stock motor included in a Tamiya kit though, which is very basic.

[DJTheo]

By the way there exist also stock classes (at least in Germany) with special 17T or 19T "stock" motors.

Cheers

[raemin]

The so called stock class is aimed at providing all drivers with similar engines

- 27, 23, 19, 17 turns

- fixed timing

- standard armature (industrial soldering, no "hand wound", no "epoxy balanced", etc..)

The whole of it allows for a reasonably cheap / good value for money engine. It is also interesting to see what manufacturer come to in order to innovate and pass through these strict rules:

- Lay down brushes allow for more timing

- removal of material on the armature in order to increase rpms and make a 27turn works like a 23 turn (less torque, more speed).

- specific treatments on the bushings to make them almost as smooth as ball bearings

etc...

All in all these motors are very good value for money.

[julesbristol]

Thanks guys, very informative. Jules