View Full Version : 4300,5800,etc. Brushless Motors


kevjoh
11-09-2005, 02:33 PM
OK lets discuss brushless motors.
Maintence and other subjects we need
to know about these motors.
Thanks

pmsimkins
11-09-2005, 02:36 PM
do you have a specific question?

erock1331
11-09-2005, 02:38 PM
kevjoh,
did you see the brushless forum ?

http://www.hobbytalk.com/bbs1/forumdisplay.php?f=141

erock1331
11-09-2005, 02:40 PM
Also try this thread for oval related brushless topics
http://www.hobbytalk.com/bbs1/showthread.php?t=121406

kevjoh
11-09-2005, 03:02 PM
Most of other forums you linked was
mostly on the esc. What I need and sure others
would like to know what maintence needs to be
done. When to replace the shaft bearing, when
to replace the magnetic armature, how to dyno,
how to know if brushless motor is running at
full potential, ect........
I see that NOVAK is selling the motor guts on their
website.
KJ

erock1331
11-09-2005, 03:09 PM
ok gotcha

pmsimkins
11-09-2005, 03:13 PM
Good questions. I replaced my bearings after an entire indoor season. The old bearings felt exactly the same as the new bearings, so I would say once a year is sufficient for replacing the bearings.

I measured the magnetic field of a rotor with 1 run on it, versus a rotor with about 9 months of racing on it and there was only about a 1-2% drop in the flux density of the field. So, I would say the rotor is also good for about a year of racing.

Otherwise just put a little oil in your bearings once in awhile and you should be good to go with no other motor maintenance.

pmsimkins
11-09-2005, 03:16 PM
As for dynoing you can dyno the motor by running it throught the speedo. there were some turbo dyno numbers posted elsewhere that looked pretty accurate. I honestly would not bother dynoing your motor though. Dyno numbers inevitably vary even if the motor does not, so you could end up chasing a problem that really isn't there.

Kenwood
11-09-2005, 03:40 PM
As far as a dyno goes you could simply put it on a PSE chassis dyno... Typically I bring mine or Roger...then you could play with the gearing as well..

kevjoh
11-09-2005, 03:49 PM
COOOOOLLLL thats the info I'm looking for!!!
Kenwood bring it Sat. I'll be there thurs night
to practice.
KJ

amainiac
11-09-2005, 09:37 PM
Kevin,
I'm not sure how you would hook up the Thor on a B/L motor, it has 3 wires to hook up and the Thor only has plus and minus wire. Be careful not to damage your motor.
My recommendation would be to start at 2.20 R/O (for your 5800 @ WOH) and adjust one tooth at a time (down or up) and check your lap times until you find the sweet spot. The motors are so consistant from run to run its pretty easy to find what works best. You gotta remember a higher rollout wont necessarily make the car faster unless its efficient enough to use the bigger gear, it will however get the motor and speedo alot hotter since its working harder to pull out of the turns.
As far as maintenance goes...one drop of oil once in a while. My touring car has over 200 runs on the 5800 and I oiled it once! It works as good now as the day I bought it.