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10-25-2010, 09:26 PM
| #1 |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
|  motors are sparkin'
I have 2 different HH motors, both are pro handwounds. I have the 45T timed at roughly 8 degrees, and the 35T timed at 12 degrees. Both of them spark while running at anything 25% throttle or more. Is this normal? I had read that retarding the timing would stop the sparking. Now, I am no motor expert, however, when I was 20 years old, I had a job hand building the aileron control motors for Stinger missiles. That was pretty cool. I wish I would have taken some pics back then. Casey |
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10-25-2010, 09:32 PM
| #2 | |
| Pebble Pounder Join Date: Jan 2009 Location: Colorado Springs
Posts: 112
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10-25-2010, 09:34 PM
| #3 |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
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So, turning down the comms and making sure the brushes have really good contact is the way to make less sparks......makes sense. Thanks. Casey |
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10-25-2010, 09:38 PM
| #4 |
| I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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Negative timing will more than likely cause more sparks.... Some sparks are normal.....if there is a lot, thats not normal.....might need new brushes and a comm cut. A comm cut gives you a new surface and gets rid of any grooves in the comm.... Later EddieO |
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10-25-2010, 09:40 PM
| #5 |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
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Well, I will play around with the timing a bit. The sparks are not that much. Plus, the motors are damn near new.
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10-25-2010, 09:56 PM
| #6 |
| RCC Addict Join Date: Jun 2009 Location: QLD, Australia
Posts: 1,512
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Tiny blue ones around the brushes with no load and reasonably high throttle are normal. But larger ones that 'jump' can be because of retarded timing. Make sure you turn the endbell the OPPOSITE direction of the intended forward rotation of the motor. Kieren |
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10-26-2010, 12:48 PM
| #7 |
| Rock Crawler Join Date: Jun 2010 Location: Yelm,WA
Posts: 695
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Are you sure that you have normal timing & not negative timing? May sound like a dumb question but I could see how it could get confusing to someone who doesn't have much experience.
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10-26-2010, 07:13 PM
| #8 | |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
| Quote:
 Also, when adjusting the timing on my 45T motor, I was sure to notice that my motor was spinning counter clockwise with respect to the timing marks.  | |
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10-26-2010, 07:37 PM
| #9 |
| MODERATOR™   Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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A really easy way to do it is set them both for zero timing, and leave the screws just barely loose enough so you can rotate the endbell, hit the dig switch so you can better hear each motor, keep a hand on the endbell and motor so it doesn't twist itself into some major timing setting, floor it, then adjust them so you can hear it speed up a little bit while going forward. Don't let off the gas abruptly as the drag brake may cause the timing to move. Seems to be a good starting spot for us crawlers. Zero timing Dig switch Hold motor can and endbell for safety Floor it Advance timing until faster speed is heard You could go a bit further more advanced... Then if you're getting sparks still, clean it all up, could cut the comm, etc... |
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10-26-2010, 07:39 PM
| #10 | |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
| Quote:
Casey | |
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10-26-2010, 07:43 PM
| #11 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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That'll be three beers.  |
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10-26-2010, 07:45 PM
| #12 |
| RCC Addict  Join Date: Jun 2005 Location: St. Albans
Posts: 1,441
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I wouldnt run any more than about 6* of timing on a crawler motor either. That was reverse isnt too hard on them.
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10-26-2010, 07:46 PM
| #13 | |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
| Quote:
Casey | |
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10-26-2010, 07:54 PM
| #14 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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Don't mind that at all. It's beer right? Actually, rereading, I assumed you had a MOA truck, so no need to hit the dig switch if it's just a single motor truck. |
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10-26-2010, 07:56 PM
| #15 | |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
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10-26-2010, 07:58 PM
| #16 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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And what the heck, let's keep going... are the brushes FULLY seated yet?
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10-26-2010, 08:01 PM
| #17 | |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
| Quote:
Casey | |
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10-26-2010, 08:18 PM
| #18 |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
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The 8 hour motor, yeah those are definitely broken in. The other, maybe not. You can pull a brush out and look at the face to see if it's, more or less, completely smooth all the way across the face. |
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10-26-2010, 08:23 PM
| #19 | |
| Tossin' Salad Join Date: Jun 2010 Location: Petaluma
Posts: 1,826
| Quote:
Casey | |
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10-26-2010, 08:32 PM
| #20 | |
| MODERATOR™ Join Date: Jul 2004 Location: Ohio
Posts: 18,928
| Quote:
Granted, the Losi is hard on brush motors. After fully seating the brushes before I even run a motor, I take it apart and the comm usually needs a couple passes to get it all good again. Break in is rough. Lotta work, lotta maintenance. Hence, the brushless revolution, but brush motors are the SWEETNESS! | |
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