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Old 08-19-2003, 05:59 PM   #1
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Default Spur - Pinion Combo

Another dumb post tho: 2 scenarios; 1 bigger spur and smaller pinion; and 1 smaller spur and bigger pinion. BOTH produce the same ratio.

Is the any advantage of selecting a bigger spur and smaller pinion or vice versa?

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Old 08-19-2003, 06:19 PM   #2
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If they both have the same ratio, there will be no noticiable difference.
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Old 08-19-2003, 07:36 PM   #3
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Default Re: Spur - Pinion Combo

Quote:
Originally posted by KoE
...1 bigger spur and smaller pinion; and 1 smaller spur and bigger pinion. BOTH produce the same ratio.
IMPOSSIBLE... simply does NOT work.

I'd think you mean instead:
A) bigger spur with a bigger pinion
B) small spur with a small pinion
both of which give the same ratio?

There's an earlier thread from last month discussing same topic.
There was some opinion that (B) gives slightly better acceleration.
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Old 08-19-2003, 08:34 PM   #4
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dumb me....no wonder i failed maths !!! thanks WC for pointing it out
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Old 08-19-2003, 09:43 PM   #5
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Passed me up too But I knew what he meant.
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Old 08-19-2003, 10:36 PM   #6
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isn't there something like you want the smaller because it's less rotating mass? But I dont see how this would make a difference.
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Old 08-20-2003, 02:08 PM   #7
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if you set your gear mesh vertically, a bigger combo will lower the CG(motor will be closer to the chassis), just depends on the car...
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Old 08-20-2003, 03:59 PM   #8
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Quote:
Originally posted by zachzachz
isn't there something like you want the smaller because it's less rotating mass? But I dont see how this would make a difference.
That's true, but it really wont make a noticiable difference at all.
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Old 08-20-2003, 06:02 PM   #9
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i've found yesterday the other thread that WC mentioned "Gearing Technique - Better Acceleration" ==> http://www.rctech.net/forum/showthre...oto=nextoldest

i think that they have covered quite substantively on this issue. another almost similar thread is "Final Drive Ratio " ==> http://www.rctech.net/forum/showthre...oto=nextoldest

perhaps any further discussion can be substantiated in those 2 threads. i'm sorry for creating a new one without searching thoroughly.

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Old 08-20-2003, 07:08 PM   #10
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i ve heard use smaller spur will make your motor run cooler . but i personally do not feel any difference..
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Old 08-20-2003, 08:54 PM   #11
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Quote:
Originally posted by Tag
i ve heard use smaller spur will make your motor run cooler . but i personally do not feel any difference..
That's called "gearing down" or using a lower (numerically *higher*) ratio.

Makes your motor work less hard, so it eats less current.


But severely over-revving your motor due to gearing too low
will actually make it heat up more too...
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