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noob to gearing...

noob to gearing...

Old 06-10-2009, 09:47 PM
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Default noob to gearing...

When someone refers to their gearing as "46/14" for instance, are they referring to the number of spur gear teeth to clutch bell teeth?

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Old 06-10-2009, 11:20 PM
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I would assume so, it's not a common reference. It is porbably specific to a type of chassis. Generally, the internal ratio doesn't change between cars, but the spur and pinion is the part that people do change, so i'm guessing that's it.
With Electrics the FDR and roll-out are the common measures of gearing. Don't know about nitro. Both of the afforementioned methods are a single number, e.g. 6.50 FDR or 55mm roll-out.
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Old 06-11-2009, 12:13 AM
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Originally Posted by SteveFox View Post
When someone refers to their gearing as "46/14" for instance, are they referring to the number of spur gear teeth to clutch bell teeth?

Frank

Typically... this is a very common reference. The larger number being the spur gear and the smaller being the pinion (for electric) or clutch bell (for nitro). Gearing is very necessary for electric... not so much with nitro.. most folks running nitro, tend to run the stock gears. For electric power, it is the most important tunning factor beyond tires selection and suspension.


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Old 06-11-2009, 09:14 AM
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Thanks for the clarification fellas.
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Old 06-12-2009, 05:11 PM
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smaller pinion = more torque - slower top speed - lower temps on esc/motor

larger pinion = less torque - faster top speed - higher temps on esc/motor

to be safe start with the largest spur / smallest pinion and go from there

correct me if I'm wrong fellow posters
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Old 06-12-2009, 06:06 PM
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Originally Posted by Tony_B View Post
to be safe start with the largest spur / smallest pinion and go from there
You were correct until you got here. If you go with the LARGEST spur gear, and the smallest pinion, you may end up having issues fitting your motor into your car if you wanted to then gear up. Start with a medium sized spur in the range that fits in your car, and a pinion on the smaller side. But alas, this is all too abritrary. Start a little under a optimal FDR ratio that is appropriate for your track and equipment, and gear up from there to reach best performance and best temps. For example at my track, if somebody were to ask my advice on gearing, I would stay start with a FDR of 1:5, and gear up from there. Well, 1:5 for one kind of car will be different than 1:5 on another, etc... If you just go out and throw in the largest spur you can fit in the car, you may end up with issues.
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Old 06-13-2009, 06:02 AM
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Also with brushless, starting with a very small pinion can cause heat issues.

Novak has fairly safe brushless starting recommendations, at least for typical 1/10 & 1/12 race type vehicles:

http://teamnovak.com/tech_info/brush...r_gearing.html

Jerome is correct on the original question.
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