In case you missed my point, I'll let you know what I've been playing with lately, which what effect comm drops may have. Base line rpm on this motor was 18,640. Comm had been cleaned with Brasso. Next the comm was polished with a chrome cleaner which can be found in most well stocked auto parts stores like Pep Boys. Rpm 18,900. Used Tribo and rpm dropped to 18360, but amp draw went up. Cleaned and polished and used a different comm drop. Rpm went down slightly and amp draw went up again. Sprayed motor out with motor spray, reoiled, but did not polish or clean. Rpm was 18,900. Ran motor for 5 min. at 7.2 volts. Rpm was 19,260. Waiting for the motor to cool so we can test it again. Suspect that the extra rpm was due to the motor being warm. So what does this all mean????
1. I've got more time than brains.
2. I have no idea.
3. Is this worth trying at the next race? You bet. 600+ rpm in just how you prep to race is well worth it.