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Old 06-29-2004, 01:19 PM   #1
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How hot is too hot?

i have an hpi sprint with a 17 turn motor, 3300 mah battery pack, and a 122 tooth 64 pitch spur with a 31 tooth pinion. once i was done for the day, the motor was something like 145 degrees on my temp gun! is this alright? or will it harm the motor? i dont want to have to spend more money on another motor.
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Old 06-29-2004, 01:40 PM   #2
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145*f is fine.
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Old 06-29-2004, 02:06 PM   #3
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lol, steaming hot at 145, go race a sedan on carpet and if it dosent push 170 your not getting all you can out of it. Sometimes people run them up at 180+. Your fine.
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Old 06-29-2004, 02:23 PM   #4
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how do you think i can get some more topspeed out of it though? i have a killer take-off and great run time, but no top-end!h
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Old 06-29-2004, 02:25 PM   #5
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Add teeth to the pinion.
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Old 06-29-2004, 02:26 PM   #6
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but couldnt you just go to a lower spur gear to take away acceleration?
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Old 06-29-2004, 04:12 PM   #7
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Yes its the same effect either way
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Old 06-29-2004, 06:36 PM   #8
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what would happen if you lower the spur gear teeth and raise the pinion gear teeth at the same time?
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Old 06-29-2004, 06:50 PM   #9
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add a fan
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Old 06-29-2004, 07:24 PM   #10
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what do you mean? could it overheat the motor and kill it?
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Old 06-29-2004, 07:40 PM   #11
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dont worry about the spur, if you had to ask about the motor chances are your not experienced enogh to worry about a spur change, just change the pinion
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Old 06-30-2004, 10:44 AM   #12
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thanks. I dont do much racing with it anyways. just mostly racing my buddies. I usually kick their tail though. they dont know whats under the body though.
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Old 06-30-2004, 11:12 AM   #13
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ya thats fine. 175 is at the edge. I got my motor to 215 without burning it up. u could even smell the epocky melt. If u can keep your fingure on the motor for 5 seconds then its ok
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Old 06-30-2004, 11:16 AM   #14
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A fan on touring does wonders, I don't like to run them over 130*.
But I can run a 10 turn, 4 cells, in 12th scale for 9 minutes and not get over 115*, but can't get a stock motor, 6 cells, in a 10th scale pan to go under 190*!!! Doesn't seem right. I'm thinking about trying a fan on the 10th scale pan.
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Old 06-30-2004, 11:40 AM   #15
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how do you fit a fan on a car though? are there only a few chassis' that can use them? I have a HPI Sprint, not the best racing machine. The fan sounds interesting. tell me more.
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