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Old 05-01-2003, 07:32 PM   #1
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Default Stock Motor Amp Draw

I have two monster stock motors. One is brand new and it draws 8-9amps at 4v but the other one that has been cut twice drwas 10-11amps. Is lower amp draw better or higher????????/
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Old 05-01-2003, 07:34 PM   #2
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Generally, the higher the amp draw, the better the motor will be, but it could just mean it's less efficient. I've had monsters that only draw 9 or so amps that are fast, so it really doesn't prove much. The only way to tell would be a dyno, or the best dyno in the world, the track

Hope this helps.
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Old 05-01-2003, 07:35 PM   #3
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the one with higher amp draw is hella fast but i don't know about the new one. I will find out this weekend though
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Old 05-01-2003, 07:37 PM   #4
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Yep thats the only way to do it. For monsters if you're in the 9-12 amp range it should be decent.
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Old 05-02-2003, 05:51 AM   #5
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higher amp draw usually means more torque (or less efficincy). i can't remember what law it is:

F = B I L sin (theta)

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Old 05-02-2003, 09:51 AM   #6
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Who cares if the motor is a little bit less efficient?? So long as it doesn't overheat, we certainly have the batteries to handle 10-12 amps !

Typically, the higher the amperage, the more overall power the motor will draw. But if the motors have different setups - then you may be comparing apples and oranges

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Old 05-02-2003, 09:53 AM   #7
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I had that same question. And one other one. I ran it in on my pulsar and it went over 13 amps. So it shut off because i have the novak power supply And the nova suppy only has 10 amp.. and should i ajust the volts on it ? And for running brushes in it shuts of because it goes over 13 amps so should i go down to 2 or 3 vots??? thanks
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Old 05-02-2003, 11:30 AM   #8
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i have a pulsar with a 30amp ps and when it goes over 13amps i get the same error message. I think you can only draw about 13 amps from the pulsar because the discharger on it only discharges at 10amps
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Old 05-02-2003, 11:59 AM   #9
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Higher amps draw, meaning?

Really, it's meaningless. Not to be rude or anything.

Take a note of how much it draw, use your fingers squeeze the output shaft (not too tight and not too long, or you'll get friction burn) and see how the amps draw goes up.

It will simulate a few things. Could it be the bushing is too tight? Breaking bushing properly? Or the efficiency went down the drain? Too much pressure on the brush springs? Armature not run true it will create a friction against the bushing(s)??? etc. etc..

Too many things that could makes the amps draw go high.

The best thing is to sit the car on the track and start to wheel the thing.
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Old 05-02-2003, 12:32 PM   #10
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The only time amp draw readings are useful, is right after rebuilding a motor, watching for when the amps draw flattens out ( goes up and down drasticly while the brushes are still breaking in ), and to determine when a motor is ready for a rebuild.

..althought it has to be a motor you are familiar with, as in you should know about what it should draw while ''fresh''
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Old 05-02-2003, 01:11 PM   #11
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Komkit - good points... dyno numbers in general are incredibly useless - the best dyno is and will continue to be... the track!
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