Originally Posted by sosidge
It's a mistake to assume that a sealed can motor cannot be tampered with.
In fact, there are tricks out there to advance the timing etc. which are impossible to detect from the outside.
The benefit of a rebuildable motor is that is can be easily scrutineered, and easily maintained.
Sealed can motors can't be scrutineered and can't be maintained.
There was a guy at my local track that was running a Mabuchi motor and was easily keeping up with the rest of the stocks. It still comes down to tuning and driving.
