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11-18-2007, 12:21 PM | #1 |
RCC Addict Join Date: Mar 2007 Location: MS Gulf Coast
Posts: 1,949
| Axials Scorpion Pinion and Spur Options
Does anyone have the inside scoop on when Axial is going to release lower tooth pinions and different tooth spurs. I mean aren't we supposed to have as much as a 75:1 ratio option?
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11-18-2007, 12:30 PM | #2 |
Quarry Creeper Join Date: Sep 2007 Location: Elizabethtown,KY
Posts: 342
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why wait.. when you can just buy the parts at hobby shop or online...
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11-18-2007, 01:02 PM | #3 |
Pebble Pounder Join Date: Sep 2007 Location: Vancouver
Posts: 177
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The chart in the instructions I have show ratios as low as 73.85:1 but there is no way you'll physically be able to get those components mounted. A 90t spur is about big as you're gonna fit. Any bigger than that and the spur begins to hit the output shaft. On the motor, a 10t pinion is about as small as you'd want to use. That gives a 69.23:1 ratio, which is really steep in the Scorpion. |
11-18-2007, 02:57 PM | #4 | |
I wanna be Dave Join Date: Feb 2004 Location: Columbia Gorge
Posts: 5,512
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What 90 tooth spur did you try? Brand? Not all manufactures creat the same exact parts. I have spurs and pinions from a wide variety of manufactures and everything is slightly different. My 87 tooth(48 pitch) spur from one manufacture is much larger than one from another manufacture I have. So your information may or may not be fully correct. | |
11-18-2007, 03:31 PM | #5 | |
Pebble Pounder Join Date: Sep 2007 Location: Vancouver
Posts: 177
| I have been using Kimbrough spurs. Apparently, with the right driveshaft yoke (I don't know the specifics) a 93t Kimbrough will just barely squeak by. Quote:
I also know this: Diametral Pitch ÷ Teeth = Pitch Diameter Example: 87 / 48 = 1.8125 So, an 48 pitch spur with 87 teeth will be 1.8125 inches in pitch diameter (not overall diameter -- that will be slightly larger), regardless of who made it. If you have two 87t spurs from two manufacturers, and they aren't (within a very small tolerance) the same diameter? Then one of two things true: 1) The number of teeth is wrong, count them again. 2) One or both of the gears is/aren't 48 pitch. Last edited by TunaMaxx; 11-18-2007 at 03:35 PM. Reason: Added math example | |
11-18-2007, 06:08 PM | #6 |
RCC Addict Join Date: Mar 2007 Location: MS Gulf Coast
Posts: 1,949
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Thanks guys! I was just curious mainly b/c I enjoy the smoothness of the Axial Spur pinion combo...it's very quiet. I put a 13T Robinson Racing pinion in the thing and it sounded like a damn grinder or a wood chipper. I really appreciate the input fellas! |
11-18-2007, 08:25 PM | #7 | |
RCC Addict Join Date: Jul 2004 Location: The other Crawler State
Posts: 1,247
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11-18-2007, 10:29 PM | #8 |
I wanna be Dave Join Date: Feb 2004 Location: Columbia Gorge
Posts: 5,512
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11-19-2007, 12:35 AM | #9 |
Rock Stacker Join Date: Aug 2007 Location: Northern Yea Area
Posts: 68
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i went with robinson racing pinions. AWSOME! |
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