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Old 03-11-2009, 09:14 PM   #1
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Default Can I get more gear clearance?

So I had to replace my stock 72t spur. Unfortunately the smallest one the LHS had in stock was a 84. So I bought not even thinking about clearance issues. I removed my old one and installed the 84t. It hit the chassis, but not much. So I took a little bit of material away. I got it to clear and put everything back together.

Well now there is not enough clearance between the spur and pinion. I bought a bigger pinion to make up for the bigger spur, but if the 23 does not fit, this bigger one for sure is not going to fit.

Are my options to only go with a smaller spur?

--pakk
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Old 03-11-2009, 09:45 PM   #2
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You have it backwards.
By going to a larger spur gear you need to go to a smaller pinion.
Gear ratio is a measure of spur divided by pinion (spur/pinion = ratio). So to install the same ratio you were running before you have to divide 72 by whatever pinion you were running, then divide 84 by pinion counts until you come up with the same final ratio.
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Old 03-11-2009, 09:56 PM   #3
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72/23=3.13

84/26=3.23

That is as close as I could get to stock with what the LHS had. But honestly, I just want it to fit right. I thought I would have more space to play with. This kind of limits my FDR's.

As of right now, I just would like to know what my options are. I was about to buy a large assortment of spurs and pinions, but most of them are bigger than the ones I have. I'm no engineer, but the only way I see myself being able to make this work is a new motor mount.

--pakk
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Old 03-11-2009, 10:03 PM   #4
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I think it was a mistake trying to jump that much in size of the spur gear.
With 48pitch gears jumping that many teeth is a huge difference, and 4 or 5 would be a lot.
I don't know the car you're using, but if you are having clearance issues with the 84T spur it's just too large for the car and you should investigate buying spurs closer in size to what it was designed to handle. Check your manual.
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Old 03-11-2009, 10:07 PM   #5
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I should have specified. It is a tc4.

Yeah, I kinda just got what they had.

So I'll have to order some online. I think I'll go to 64p. My next question is, are 64p and 48p identical in diameter tooth for tooth?

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Old 03-11-2009, 10:11 PM   #6
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What car do you have? It sounds like the chassis would be happier with smaller spurs, and smaller pinions, so why not try to use 64 pitch? An 84 tooth at 48 pitch would be equal diameter to something close to 120 tooth in 64 pitch, whereas 72 @48 would be about the size of 90 tooth in 64 pitch (not sure but it's pretty close). These would require pinions larger in the number of teeth than what you have, but smaller in diameter, so I think you would get the adjustability back.

PS. I note you have answered my question probably as I was typing. The rest still stands. I am glad I answered your question about diameteres though.

Last edited by niznai; 03-12-2009 at 01:44 AM.
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Old 03-11-2009, 11:56 PM   #7
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Try searching here http://www.rctech.net/forum/electric...?highlight=tc4 or post your question there...you will probably get more detailed and quicker responses there. Good luck!

-rocky b
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