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04-16-2009, 06:41 PM
| #1 |
| Quarry Creeper Join Date: Feb 2009 Location: Richmond, VA
Posts: 379
|  Pinion or Spur Question
I want to know if I want to make my crawler go faster do I change the pinion or the spur? At the present time I have an 87 spur and a 14t pinion. Thanks in advance. Is a 10T motor higher or lower than a 12T motor?  |
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04-16-2009, 06:51 PM
| #2 |
| 2006 2.2 National Champ   Join Date: Dec 2004 Location: Big Bear Lake
Posts: 8,328
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You can change either the pinion or the spur to go faster. Bigger pinion or smaller spur gear will increase wheel speed. The 10t motor will be faster then the 12t. The higher the turns in a motor the more torque you'll get, with less wheel speed. |
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04-16-2009, 07:43 PM
| #3 | |
| Quarry Creeper Join Date: Feb 2009 Location: Richmond, VA
Posts: 379
| Quote:
10T motor more wheel speed. 65T motor more torque.  | |
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04-16-2009, 08:55 PM
| #4 |
| Suck it up!  Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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Look at your gearing like this... The closer the two gears are in size, the faster you'll go, but you'll lose torque. ~ 20p/87s The further away they are in size, the slower you'll go, but you'll gain torque. ~ 14p/87s A high wind motor (65t) will give you torque at the expense of speed. You'll also get longer run times. A low wind motor (10t) will give you speed at the expense of torque with shorter run times. |
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04-16-2009, 09:32 PM
| #5 |
| I wanna be Dave Join Date: Jul 2005 Location: North Idaho
Posts: 3,648
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Oh yeah!!!! I went from the stock 14T pinion to a 18T pinion and noticed a big diffence. Two down sides of putting in a larger pinion, first my battery life went from ~40 min.s to ~25min.s; second, my drag break doesn't hold as well. |
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04-16-2009, 11:41 PM
| #6 | |
| Quarry Creeper Join Date: Jun 2005 Location: in the middle of the pacific ocean
Posts: 455
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04-17-2009, 06:02 AM
| #7 |
| Quarry Creeper Join Date: May 2008 Location: ncrccrawlers.com
Posts: 216
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Hey BMFOTB....voltage plays a big roll too. A 6cell stick pack at 7.2v will give about half the wheel speed of a 3s lipo at 11.1v no matter what gear or motor you have. If you have searched enough you will see that they say to gear down and volt up. Meaning to run the 14t/87t combo with 45turn-55turn motor for peak torque with a higher voltage for more speed.
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