Lowest tooth pinion that works with 66t spur?

[Joey]

I want to get the lowest tooth pinion I can that will fit with the standard 66t spur with the motor mount's range of motion. Tower hobbies has down to like 9t pinions... but will they fit?? Any info would be appreciated!

[ezillarules]

17 is the reccomended as i can see things being broken if you go any lower as you will get more torque and will probably melt those diffs but i supose it all depends on what motors you run:cool:

[BitHed]

...i know for a fact that 16's will PHYSICALLY fit..Anything lower than that and I recommend you watch to much 'slower' motors or it will be flipping faster than a one-handed grill cook during a MacDonalds lunchtime...

Good question though...I have no idea at what tooth count the shaft will no longer reach the spur...

EDIT: I lied...I actually DO know the measurement but you will need to physically check...

A 32 pitch 9t pinion has a diameter of 0.35in (8.8mm)...That would mean that the pinion is 4.4mm to the outside edge from the shaft :D Or thereabouts...

[DirectGumby]

Even with the 16 tooth pinion plus the 65 turn motors will still cause me to flip? Even if I got to a smaller gear?

[ianjoyner]

you won't flip if you are careful with the throttle

[Joey]

Thanks for all the info. The reason I ask is this... With the standard gearing, when you reach the throttle's first speed, the slowest speed to get the car moving, it still jerks just a little and is pretty fast for a slowest speed. I wanted to go to a low tooth pinion for trail running/crawling/mudding purposes for the extra torque and lower speeds it provides (keep in mind the motors and spur are still stock). But, does this mean that the "slowest speed" you get from barely touching the throttle trigger will be even slower as you decrease pinion size?? If so this would really help to keep traction when you want it to barely crawl forward and not give a slight jerk into motion which could break traction. Also the boost in torque at low speeds will be really nice for this type of driving. Hope this makes sense!

[ianjoyner]

Thanks for all the info. The reason I ask is this... With the standard gearing, when you reach the throttle's first speed, the slowest speed to get the car moving, it still jerks just a little and is pretty fast for a slowest speed. I wanted to go to a low tooth pinion for trail running/crawling/mudding purposes for the extra torque and lower speeds it provides (keep in mind the motors and spur are still stock). But, does this mean that the "slowest speed" you get from barely touching the throttle trigger will be even slower as you decrease pinion size?? If so this would really help to keep traction when you want it to barely crawl forward and not give a slight jerk into motion which could break traction. Also the boost in torque at low speeds will be really nice for this type of driving. Hope this makes sense!

I think a lower pinion would help you with this. If you really want to lower the speed and increase the control look at crawler motors.

Try the pinions first though, I don't know what is the smallest that will fit, you should be able to guess by measuring the amount of movement the motors have. They are not expensive, try some and let us know how it performs!

Ian

[BitHed]

...I wanted to go to a low tooth pinion for trail running/crawling/mudding purposes for the extra torque and lower speeds it provides...

...To a point that will be successful but at some stage you will have the motor working below its optimum...I wouldnt JUST go with the pinion but I would look at a higher turn motor too...

...I can run the truck with the 37t Yokomo motor and 12 cells and it goes fine and has some decent speed for chasing the neighbourhood kids, hell you could even crawl with it now and then but it works WAY too hard for a 'bashing' motor...(and yes i KNOW this isnt a wise way to run but i am 'experimenting' )

...My best advice would be to look at whats avialable with motors and think about having a high turn one on on your workbench to play with...

...What i am trying to say is dont JUST rely on the pinions for the effect you want to get...

[Joey]

Good advice, thank you. :) Im not super hardcore into going full out into a separate bashing or trailing setup, just more whenever I have time to kill type driving for fun. I think messing with pinions will work fine for me here, but I will definitely try different motors eventually! Do the higher turn motors provide much more torque than lower turn motors, or just slower speeds?

[BitHed]

...again I am not the expert, and i think this is explained more in depth in Kosta's stickies in the brushed motor section...

...BASICALLY a HIGH turn motor gives you MORE torque for the same amount of battery power used compared to a motor with LESS turns...I know not why :o To make a HIGH turn motor run your truck at the SAME speed as a LOWER turn motor means it takes MORE battery power and it makes the motor work HARDER and thus get HOTTER and cause itself more damage...

...Thats why you have on-roads with single digit-turn motors and motors like the Integy Lathe motors in crawlers with 55+ turns...Go fast vs. go slow...

...In all honesty i didnt even know that such an oddity as a 65 turn motor EXISTED until DG loaded his...

[Joey]

Thank you, that does make complete sense. :) Those 65 turns could probably pull a small (real!) car down the street!