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  #1  
Old 01-20-2006, 09:33 AM
zpzps zpzps is offline
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Join Date: Jan 2006
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Lightbulb pinion

hey couldn't you put a monster truck 7 tooth pinion on an se to make 10:28 gears
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  #2  
Old 01-21-2006, 12:26 AM
chilli_mp138 chilli_mp138 is offline
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zipzapa--

Nope! Not 10:28. Recheck your calculations on my site--I think you'll find it is 10.28:1.

The idea is fine, but check to see if you get good gear mesh with the 7-tooth pinion.

I take it you're looking for speed, so keep looking for an 8-tooth and a 9-tooth gear which mesh properly with the idler gear. The shaft hole in the pinion on these gears will often be larger than the motor shaft diameter. I find a piece of small-diameter electrical wire insulation which press fits over the motor shaft will sometimes increase the diameter so a larger pinion can be used. In fact, you might have to do that with the MT's pinion, maybe even drill the pinion hole a tiny bit larger to accomodate the insulation added to the motor shaft.

If you've looked at my MT mods section, you might have noticed I've done that with a gear box. Look for the red insulation as a part of the 8-tooth pinion on the "fast" MT gear box mod.

An interesting possibility is to cut apart the four different transfer/idler MT idler gears and use the 8-, 9-, 10-, and 11-tooth parts as modified pinion gears on your ZZ or ZZSE. And since that pinion is always driving the 18-tooth section of any ZZ/ZZSE transfer/idler gear, you have two different ways to adjust the gear ratio for your car. With different motor RPMs you add a third factor. I'll see if I can make a chart of the options in the morning.

chilli
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  #3  
Old 01-22-2006, 07:17 PM
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Racer9 Racer9 is offline
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Actually that ratio would provide more speed than the 12:1 but less speed and more torque than the 9.86:1
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  #4  
Old 01-22-2006, 08:39 PM
chilli_mp138 chilli_mp138 is offline
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Racer9--

Please help clarify for me the relationship between a motor's rotational speed and torque. I hear on this forum (and others) that in an electric motor torque is indirectly proportional to the rotational speed speed of the motor. Electrical engineers say that is not true for electric motors but is true for internal combustion engines. They suspicion some are applying IC principles to electric motors, which they say cannot be done. Could you help, please?

chilli
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