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Old 12-03-2005, 07:19 PM   #1
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Default XX-4 spur/pinion selection

Any help is appreciated. Noob here.

I have a xx-4, I just bought a GTB 5.5

It has the purple spur in it, which I believe is a 84T. Now with searches in this forum, I've come up with around 20T as what was recommended. However the Novak manual doesn't list a 84T pinion. The closest is a
82 which calls for 16 or 17. Any ideas? I don't want to overheat this motor.

Thanks, Kevin
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Old 12-03-2005, 11:27 PM   #2
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You would be best to start off with an 17t pinion with the 82 spur and then work your way up to a 19 tooth pinion. Don't go any higher than that, I don;t have any experience with a brushless, but from what I have read, gearing these are critical, it would be better to undergear (smaller pinion) than to over gear (large pinion). A 20 tooth seems to large, and you probably think to yourself you don't want to wreck anything so quickly, so be safe and stay under the 20 tooth.
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Old 12-04-2005, 12:37 PM   #3
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With a 10 turn motor I'd gear 7-8 over meaning 17-18 pinion. I don't know how the brushless compares to normal motors for power/gearing but I think you may need to gear them slightly taller......only problem is don't really know if you can consider/gear the brushless the same as a10 turn or more like 13 turn for example. So taking gearing info I gave you for 10 turn take that and call the manufacturer(Novak Electronics #949-8333-8873) and see what they have to say about gearing...takes little more effort to call them but they should know more than anyone else being they make the product.
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Old 12-04-2005, 01:20 PM   #4
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I'm a brushless guy too, I can help you out with what will run well and what will overheat. I have a friend with the same system too.

13-15 pinion, and about 82-87 spur gear depending on what you race. That shouldn't overheat and will run well. I have a 9 turn and I need about a 15-16 pinion gear in mine, 16 is the actual I use. I would only concentrate on what won't overheat, that motor is fast enough to push any "reasonable" pinion/spur you throw at it.
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