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black can help

PostPosted: Wed Apr 01, 2009 9:41 am
by justaddmud
is mine kaput?

tested it in my mini at the track on sunday and was gutless

spec is, tamiya teu 302bk speedo 3200 20c lipo and 20t pinion s grips on rear m grips on front

with this spec i could hold it flat out round the entire track and was at full speed before half the straight, had a race with one of the tamiya brushless boys and his was a lot faster

so is my black can a dud ?

hasnt even done 2 meetings

Re: black can help

PostPosted: Wed Apr 01, 2009 6:42 pm
by Shawn Herrington
The speedo may need re-setting with your transmitter, otherwise:

Is the comm dirty?
Rhys' was slow in one of the heats and I changed it for another. But after giving it a squirt of WD40 and a run on low power to clean the comm, followed by a blast of motor cleaner a re-lube it was back up to speed for the final.... of which I have just noticed he was first Mini home.

These motors do seem to like a low voltage run it period. I bed mine in for about 30 minutes on 4 volts and don't cause any problems. Due to a lack of time after building the car up the one motor I didn't do it on was the one mentioned above :oops:

Re: black can help

PostPosted: Wed Apr 01, 2009 8:07 pm
by justaddmud
thanks shawn, the comm does look a bit grubby, and i didnt bother to run it in at all, so will clean the comm up and run it in for a bit

also heard before of people running motors in underwater? whats that about

Re: black can help

PostPosted: Wed Apr 01, 2009 8:22 pm
by Shawn Herrington
it's to bed the brushes in quicker. Because they are so hard it can take along them along time to get to their optimum contour under normal running.
Many say it's better but most say it's the quickest way to wreck your motor. After about 30 seconds the brushes are worn in.
I have been known to try for a little bit longer until it was metal to metal... :oops:

On RC-Tech there is quite a good thread about silver cans and alot can be learnt there.

My method of 30 minutes run in at 4 volts came from there.
Basically you need to bed the motor in until there are minimal sparks. At maximum revs on the car the sparks just burn the comm and if your are really unlucky cause interference.