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  1. #1
    RC Racer
    Join Date
    Dec 2011
    Location
    Springfield MO
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    249

    Hot motor what should I do to reduce temps.

    Just as the title says my motor is getting hot and also my esc fan is turning on but im worried about the motor because its so hot that if I touch it it burns me pretty bad I think the esc fan is kicking on because of the doughnuts. I want to know if I need a larger or smaller spur im thinking larger to cool the motor because I also do speed runs. Im using a 2s 20c 8000mah lipo and a 3s 5000mah 25c traxxas lipo btw.
    That's me!

  2. #2
    RC Racer
    Join Date
    Feb 2012
    Posts
    142
    Gearing down always lowers temps.


    Bigger spur gear or smaller pinion

  3. #3
    RC Racer
    Join Date
    Dec 2011
    Location
    Springfield MO
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    249
    I would think smaller spur actually because the motor wouldnt have to work as hard to go fast. It doesnt really make sence to me.
    That's me!

  4. #4
    RC Champion
    Join Date
    May 2010
    Location
    Nova Scotia ,Canada
    Posts
    1,246
    First thing I would do is purchase a temp gun so you know how hot that motor is.

  5. #5
    RC Racer
    Join Date
    Feb 2012
    Posts
    142
    It is all about engineering, i'm 17 years old so it is hard for me to explain. If you want to really look it up it involves input and output gears, i'd google it if i were you!

  6. #6
    RC Qualifier
    Join Date
    Feb 2011
    Location
    Detroit, MI
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    405
    How often does the fan come on and how long does it take when you first start driving? A bigger spur will help alot . Also let us know what gearing you are using

  7. #7
    RC Racer
    Join Date
    Dec 2011
    Location
    Springfield MO
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    249
    Wont I go slower though how do people going 65 keep thier motors cool with that speed gearing. Also im using the stock gearing 62 tooth spur and stock pinion. The fan usually turns on after 15-20mins depending on my speed and how tall of grass im running in.
    That's me!

  8. #8
    RC Racer
    Join Date
    Feb 2012
    Posts
    142
    stock pinion is 18T isn't it? so 65-18 isn't bad... i run 65-23 and run at about 122F on the motor usually on 30C 2s 5300mah packs, Maybe it is the grass because if the motor is just spinning and not a lot of traction it will get hot

  9. #9
    RC Racer
    Join Date
    Dec 2011
    Location
    Springfield MO
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    249
    Thats it! It didnt get hot untill I started doing doughnuts on the gravel road near my house.
    That's me!

  10. #10
    RC Racer
    Join Date
    Feb 2012
    Posts
    142
    i'd get a temp gun!

  11. #11
    RC Champion
    Join Date
    Jun 2009
    Location
    W Monroe, Louisiana
    Posts
    1,996
    There is no substitute for a temperature reading. I cant tell the difference between 150*f and 190*f. Both burn my finger and i would 99% be guessing if i was forced to guess. You could always use this as an excuse to get the TQi radio with telemetry temp sensor.

    Also, each person has a different pain tolerance level. My wife can grab hot things out of the microwave that would make me cry.
    Its All relative to your perspective.

  12. #12
    RC Racer
    Join Date
    Dec 2011
    Location
    Springfield MO
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    249
    Im getting the CC blower and the venom onboard temp reader.
    That's me!

  13. #13
    RC Qualifier
    Join Date
    Nov 2011
    Location
    Western Kentucky
    Posts
    792
    Are you using the stock wheels and tire
    ERBE,Losi 8ight,Slash 4X4

  14. #14
    RC Turnbuckle Jr. 87 GN's Avatar
    Join Date
    Mar 2010
    Location
    kansas
    Posts
    7,890
    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..

    Motor ~ 180/190*F maximum, ideally 140/160*F, temps can be 10* higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F
    Lipo's ~ 140*F max, ideally 100/120*F
    Would you go flip my truck back over??

  15. #15
    RC Qualifier
    Join Date
    Feb 2011
    Location
    Detroit, MI
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    405
    Is it a bad thing when. The fan kicks on?

  16. #16
    RC Champion
    Join Date
    Jun 2009
    Location
    W Monroe, Louisiana
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    1,996
    Quote Originally Posted by Kitchen View Post
    Is it a bad thing when. The fan kicks on?
    Nope. Its doing what it is designed to do. Keeping your engine and esc at optimal temperature will actually be better for the longevity of your batteries, motor and esc. Like 87gn said, 140/160f for the esc and motor is perfect.
    Its All relative to your perspective.

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