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Old 04-28-2003, 09:31 PM   #1
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modified motor for 1/12 pan car?

i just got my yokomo worlds edition 1/12 pan car. what kind of modified motor should i run? and what spur and pinion combo? the LHS track is a indoor carpet , and its tight. i currently have a 19 turn trinity, but i would like to run a modified motor too, any recommendations?
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Old 04-28-2003, 09:52 PM   #2
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Any idea what the others are using? How long is the longest pull on the track?
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Old 04-28-2003, 09:53 PM   #3
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i run the same car and i use the reedy Ti motors i like my 10X2 and 9X2. i ran a 94 spur, if the track is tight, try a 20 or 21 pinion
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Old 04-29-2003, 12:33 AM   #4
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i have a reedy ti mod 10x2 and a 12x3 that i use on my touring car. i was thinking about using the 12x3 as a initial test. i have a extra 75t spur and a 19 t pinion (48pitch), the yokomo spur is a 100 t , do you know what pitch it is? most guys run trinity mod's with a 10x1 or 12x2. but i have never used any of the trinity mod motors. by the way what servo are you running on your yoko world car?
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Old 04-29-2003, 09:20 AM   #5
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the 100t is 64 pitch. 64 pitch is what you really want to use for 12th scale. your 10 turn should be fine, but try your 12 as well. I race for axiom motors and use their reedy ti base cans. i dont care for trinity so i do not use their products. servo, i use a jr 3550
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Old 04-29-2003, 12:29 PM   #6
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why do you suggest 64 pitch over the other pitch? thanks for all the suggestions .
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Old 04-29-2003, 02:51 PM   #7
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64 pitch will give you less resistance but will wear out to quick off road.
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Old 04-29-2003, 02:53 PM   #8
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A 48 pitch spur gear has less teeth for the same diamater of a 64 pitch gear. You get more gear ratios, or a bigger selection.

96 teeth in a 2" 48 pitch gear. 128 in a 64 pitch 2" gear.

For example: 48 pitch 75 spur, 25 pinion = 3 to 1 ratio

64 pitch 99 spur, 33 pinion = 3 to 1.

Now change one tooth and see the difference:

75 tooth 48 pitch, 24 Pinoin = 3.125 to 1

99 tooth 64 pitch, 32 pinion = 3.09 to 1

More selection of ratios as your tires wear, and a bonus of quieter gears. Change your spur by one or two teeth and things get even closer.

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Old 04-29-2003, 03:13 PM   #9
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64 pitch gears are also more efficient
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Old 04-29-2003, 03:43 PM   #10
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when calculating your overall gear ratio don't forget to add in the final drive.
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Old 04-30-2003, 05:29 PM   #11
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I run an 8 double.
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