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Old 03-06-2009, 04:41 AM   #16
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who bought 09's
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Old 03-06-2009, 07:34 AM   #17
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Originally Posted by tc3team View Post
In short, 64dp has a closer range of possible gear ratios, but 48dp is stronger.

I prefer using 48dp for that very reason

If you miss-mesh those 64 pitch gears wrong, you'll end up having to buy a new spur.
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Old 03-06-2009, 12:52 PM   #18
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I prefer 48 pitch, as they are more forgiving, and more resilient on dirty tracks.
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Old 03-06-2009, 10:16 PM   #19
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Efficiency is the main difference between the two. Qualitatively you can tell because the coarser pitch (48 vs 64) is noisier. Noise is energy lost (just as heat, etc). To control noise the only thing one can do is adjust play between pinion/spur. Loud noise indicates too much play.

But the story is more complicated than that.

A finer pitch has two ways of improving efficiency. First, at the same diameter the finer pitch will have more teeth, so you gain torque. But that's not the comparison most are interested in, since what we want is to know is which is more effcicient at the same gear ratio. This means a 64 pitch spur will have a smaller diameter, but the pinion will have a smaller diameter too. The ratios of these diameters can be used to compare the torque between using 48 and 64 pitch, and 64 pitch comes ahead.

The tooth profile is important too for efficiency and as far as I can tell the tooth profile is identical on the spur and pinions in 64 pitch whereas on 48 they're not. Backlash (american) or play is another important factor (very important actually) in efficiency and here 64 wins again since the smaller teeth allow for a closer engagement (smaller play) which in turn gives better efficiency.

All that is rather academic unfortunately since the general efficiency of spur gears (straight cut teeth on wheels) is between 98-99% irrespective of pitch, etc. So the best you can hope for is an advantage of 1% over your opponent. This is why other considerations come before efficiency as has been demonstrated already by previous posts.

My personal preference is to run 64 pitch, but I am mainly running TC on carpet, indoors. I have however converted some of my offraod cars to run 64pitch but they have enclosed gears, so there is no problem with dirt, etc. I have never had any problems at all whatsoever with it (I use Kawada pinions and spurs) and the part I like best is that my car is silent as a ghost on the track.
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Old 01-30-2013, 08:37 AM   #20
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First, I'll apologize for bumping a 3 year old thread.

Second, does 48 vs 64 pitch change when comparing brushed to brushless??

Also, keeping FDR the same, why is it better to have a bigger pinion/spur vs a smaller pinion/spur??
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