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Old 07-22-2009, 06:52 AM   #1
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Hi, i just got a old schumacher i had laying around running..

problem is, the motor is getting really hot..

im running a 30pinion/92spur (3.07).. am i overgearing it?

the other spur i have is a 86t which would make it 2.87,

should i put the other spur on?

running 540 motor by the way.
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Old 07-22-2009, 07:00 AM   #2
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The 86 spur will just make it hotter.

What motor is it and wich schumacher model?
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Old 07-22-2009, 07:02 AM   #3
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schumacher 1..

just a car i had laying around..

running a crappy old 480.. but i have a johnstone 540 laying around.. i might put that on instead
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Old 07-22-2009, 07:04 AM   #4
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Did you check all your bearings to see if they are bound up or dirty?

If it was just laying around make sure the drivetrain is loose and spins freely.
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Old 07-22-2009, 07:10 AM   #5
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when the motor is not meshed, it can roll freely for miles

but when i mesh it no matter how loose, it doesnt roll as good? normal?
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Old 07-22-2009, 07:14 AM   #6
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Lube the bearings/bushings in the motor.

If that doesn't work, try another motor.

As for the 540 gearing, try the schumacher website and look for stock or 27 turn gearing options. They will probably give you an FDR suggestion. That's Final Drive Ratio. Then go to gearchart.com to punch in your spur/pinion and car model to figure out your options.
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Old 07-22-2009, 09:14 AM   #7
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ok i cleaned the rear diff as it was dirty and tight.

read through the manual..

and it says if running a 20t pully

max tooth sum - 131
min tooth sum - 108

is that just the spur(92t)+pinion(30t)? or am i adding the 20t pully aswell..
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Old 07-22-2009, 09:22 AM   #8
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Old 07-22-2009, 09:26 AM   #9
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Quote:
Originally Posted by LiL_JaSoN View Post
when the motor is not meshed, it can roll freely for miles

but when i mesh it no matter how loose, it doesnt roll as good? normal?
This is normal because the motor provides resistance on the drive line. It's good the car rolls for miles if no motor is installed because this means your driveline is relatively smooth.

Do you have a temp gun? Sometimes motors just get "hot" to touch, but are well below the max recommended temperature.

In general, if a motor is too hot, get a bigger spur and/or a smaller pinion.
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Old 07-22-2009, 09:34 AM   #10
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perfect car for VTA..love old school
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Old 07-22-2009, 09:54 PM   #11
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thanks, ill see how the car runs..

i had it laying around in the garage, and it looked like i still can get parts for it.. so i decided to get it running.

i got a temp gun, i guess ill be aiming between 38-66c

Quote:
Although not always true, a rule of thumb is:
Hot motor, cool controller, cool batteries = undergeared
Cool motor, hot controller, hot batteries = overgeared
hot motor, hot ESC, and hot batteries = way overgeared
Warm motor, warm controller, warm batteries = happy components

Hot, warm, and cool vary as well, so here's another general rule:
Hot for a motor = generally over 160F (71C)
Hot for a controller = generally over 150F (66C)(or "thermal" range for the controller)
Hot for batteries = generally over 150F (66C) for nimh, 130F (54C) for lipo
Warm for a motor = generally 100F (38C) through 150F (66C)
Warm for a controller = generally 100F (38C) through 130F (54C)
Warm for batteries = generally 100F (38C) through 130F (54C) for nimh, ambient temp through 120F (49C) for lipo
Cool for all components = generally ambient temp and up to 10 degrees F (5.6C) more

The reasons the above are not always true are numerous, but may include:
Sticky drivetrain - will put un-necessary strain on electronics whether geared correctly or not.
Poor quality batteries - batteries will heat up regardless of gearing.
Wrong motor for the application - will put un-necessary strain on electronics whether geared correctly or not.
Wrong controller for the application - will put un-necessary strain on electronics whether geared correctly or not.
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