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  1. #1
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    High motor temps

    I have been noticing after about 20 min of bashing my motor is approaching 195 degrees is this normal and can the esc heat the motor if the fan is not working

    Also unrelated to temps is the diff spool that traxxas makes worth getting for bashing or should I stay with gear style
    Last edited by kelleye858; 03-30-2014 at 08:11 PM.

  2. #2
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    A spool will break more parts in my experience.

    The ESC does not transmit heat to the motor, no.

    Temps that high are not normal, no. They can also permanently damage your motor.
    I wouldn't be surprised if your motor has already suffered some damage.

    I suggest gearing down... a smaller pinion or a larger spur.
    Whatever it is I just typed... could be wrong.

  3. #3
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    I'm running stock gearing I believe it's 18/65 on 6s what gears would you recommend and would it help to cut holes in the body for airflow

  4. #4
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    Airflow will help, yes, but gearing will help more.

    I suggest buying a few pinions... 12, 14, & 16. This will give you some adjustment options.
    Whatever it is I just typed... could be wrong.

  5. #5
    RC Turnbuckle Jr. 87 GN's Avatar
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    well you are under geared start with the supplied 18/54 gearing with the 6s

    A temp gun is kind of a must have.....
    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..

    Motor ~ 180/190*F (82/88*C) maximum, ideally 140/160*F (60/71*C), temps can be 10*F higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F (65*C)
    The new MM2 fan runs non stop, also should be taken off when driving in wet conditions.
    Lipo's ~ 140*F (60*C) max, ideally 100/120*F (38/49*C).........
    Would you go flip my truck back over??

  6. #6
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    ok so the 18/54 is not just for 4s i read that it should not be ran with 6s. also it only seems to run over 160* when the air temp is above 75*. i just dont want to damage anything with gearing down and or overheating

  7. #7
    RC Turnbuckle Jr. 87 GN's Avatar
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    well gearing has a lot of factors air temp, tires, "gearing", cell count, etc....
    I run 21/54 on 4s, there are a few members that run 21/54 6s, a bit over geared if you ask me.. but it works for them



    i just dont want to damage anything with gearing down and or overheating

    you need to gear up not down.....

    gearing up........
    larger pinion or smaller spur


    edit
    the stock gearing is actually for NiMH batts..
    Last edited by 87 GN; 03-30-2014 at 11:24 PM.
    Would you go flip my truck back over??

  8. #8
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    Quote Originally Posted by 87 GN View Post

    you need to gear up not down.....

    gearing up........
    larger pinion or smaller spur
    Wouldnt that be gearing down? Spur gear / Pinion = gear ratio. Larger pinion, lower gear ratio.
    Or am I way off here, confusing..
    Erbe
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  9. #9
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    High motor temps

    Quote Originally Posted by ronnyen View Post
    Wouldnt that be gearing down? Spur gear / Pinion = gear ratio. Larger pinion, lower gear ratio.
    Or am I way off here, confusing..
    Just listen to him (87 GN) he had helped a lot of folks here, and I am one of them. Not having any problem with his advices so far : )

  10. #10
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    Quote Originally Posted by Ady75 View Post
    Just listen to him (87 GN) he had helped a lot of folks here, and I am one of them. Not having any problem with his advices so far : )
    He seems to know much about everything, yes.
    Erbe
    Custum Erbe
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  11. #11
    RC Turnbuckle Jr. 87 GN's Avatar
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    you can play with the BrianG gearing chart.....

    the ideal Spur/Pinion Reduction Ratio is 3.0 :1
    18/54 6s is 3 :1
    18/65 6s is 3.61 : 1

    anything over 3.0 is under geared
    anything under 3.0 is over geared


    You are pushing the motor to get the speed you are wanting, gearing it up you will not be so hard on the throttle to get the speed you are looing for.



    Diff ratio

    4s = 40 mph
    5s = 50 mph
    6s = 60 mph

    change the cell count, spur & pinion count, & tire size.


    BrianG speed chart:

    http://www.scriptasylum.com/rc_speed/top_speed.html

    Copy / paste: Import this:


    Differential Ratio: 2.8461538461538463
    Transmission Ratio: 1.8333333333333333
    Other Ratio: 1
    Spur Tooth Count: 54
    Pinion Tooth Count: 21
    Total Voltage: 22.20
    Motor KV: 2200
    Tire Diameter (inches): 5.9
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor Coil Resistance: 0.006
    Spur/Pinion Ratio: 3 : 1
    Total Ratio: 15.65385 : 1
    Tire Circumference (inches): 18.54 inches (470.8 mm)
    Rollout: 1.18:1
    Total Motor Speed: 48840 RPM
    Vehicle Speed: 54.76 mph (87.97 km/h)
    Effective KV Value: 2200
    KT constant: 0.61 oz-in/A
    Last edited by 87 GN; 03-31-2014 at 05:33 AM. Reason: 3.61 : 1
    Would you go flip my truck back over??

  12. #12
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    On changing gearing from 18/65 to 18/54 that will have no ill effects on my system during bashing this is strictly an off road vehicle

  13. #13
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    Quote Originally Posted by kelleye858 View Post
    I have been noticing after about 20 min of bashing my motor is approaching 195 degrees is this normal and can the esc heat the motor if the fan is not working

    Also unrelated to temps is the diff spool that traxxas makes worth getting for bashing or should I stay with gear style
    You mention the fan not working. If you have the MM2 esc, the fan needs to be plugged into an open port in the receiver or it will not come on. It does not come on automatically at 150* like the older version.

  14. #14
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    Quote Originally Posted by apaulo1367 View Post
    You mention the fan not working. If you have the MM2 esc, the fan needs to be plugged into an open port in the receiver or it will not come on. It does not come on automatically at 150* like the older version.
    My fan wasn't working because the wires got broke under the motor but I got that fixed
    If you build it I will jump it

    Erbe 6s power

  15. #15
    RC Turnbuckle Jr. 87 GN's Avatar
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    some pep run without the fan, but it is kind of really need for 6s, 4s not so much. You need to gear up or you are going to over heat the motor and cause damage to the , bearings, demagnetize the magnets, etc......
    Would you go flip my truck back over??

  16. #16
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    87 GN I will be trying the 54t spur today if I can't bring motor temps down what would be the next possibility
    If you build it I will jump it

    Erbe 6s power

  17. #17
    RC Turnbuckle Jr. 87 GN's Avatar
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    a lighter tire like Badlands, you will be surprised the difference gearing up will make. Keep an eye on the ESC temps too.
    6s is a lot of fun all that power on tap, but comes with some cost. extra stress on the drive line, and extra heat issues.
    Would you go flip my truck back over??

  18. #18
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    I'm running trenchers could that be causing it to heat up as well
    If you build it I will jump it

    Erbe 6s power

  19. #19
    RC Turnbuckle Jr. 87 GN's Avatar
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    Org Trenchers or Trenchers X?? The X's are a bit heavy..
    Would you go flip my truck back over??

  20. #20
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    The trencher x and I changed my gearing and after about 20 min of bashing temp was up around 178* could that be an airflow issue
    If you build it I will jump it

    Erbe 6s power

  21. #21
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    extra airflow never hurts, whether it be adding a motor fan or cutting out the windshield or both. Shoe Goo and Drywall tape will reinforce the body if you find it too weak after you start cutting out the windshield.
    Its All relative to your perspective.

  22. #22
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    So to run the 4s lipo. I should run 21 spur gear and 54 pinion gear?? I want the best combo. Gonna run 2 2s lipo rcking batteries.

  23. #23
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    And the pinion gear is 32P and the spur gear is 0.8. Is this correct as well?

  24. #24
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    From what I have gathered from 87 GN 18/54 should be the correct gearing for all battery types
    If you build it I will jump it

    Erbe 6s power

  25. #25
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    I tried some new gearing 38/14 mod 1 pinion and the only thing I noticed on a test run is that it's a lot louder than the stock gears

  26. #26
    RC Turnbuckle Jr. 87 GN's Avatar
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    18/54 is a good all around gearing for 6s and 4s. Gearing comes down to controlling the temp. My 4s 21/54 gearing is a Spur/Pinion Reduction Ratio 2.57. But my drive style, tires. air temps, etc works just fine..
    Would you go flip my truck back over??

  27. #27
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    38/14 mod 1 gear and the motor temp got quite warm today so I'm going back to trusty 18/54 0.8 gears

  28. #28
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    Even with gear changes and I cut an airflow hole in my body I'm still noticing my temps get crazy high

    Outside air temp is around 80*F with the wind blowing is there something else to try to reduce temp
    If you build it I will jump it

    Erbe 6s power

  29. #29
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    Also has anyone use the castle creations fan & shroud for the 2200kv motor and is it worth getting or is it a waste of money
    If you build it I will jump it

    Erbe 6s power

  30. #30
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    iv cut the front and rear windscreen on my dodge charger body and also use CC fan and temps seem to be ok.. If it's a hot day well there's no avoiding !

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