pinion help - RC-Monster Forums

**pinion help -** 12.24.2009, 01:07 AM

im trying to run a vxl on my crt.5 i need to know which pinion to buy thanks

BrianG · 12.24.2009, 01:32 AM

Pinion is Mod1.0 pitch.

12.24.2009, 01:35 AM

i can not find mod 1 3.2mm

scarletboa · 12.24.2009, 01:57 AM

rcmonster sells a bore reducer that will allow the use of 5mm bore pinions on 3.17mm bore motors. it's cheap too

12.25.2009, 02:52 AM

im not sure which one to buy

BrianG · 12.25.2009, 03:28 AM

Look for Mod1.0 pinions with a 5mm bore. Then, get the 5mm to 1/8" bore reducer. As far as what tooth count to get, we need to know about what speed you are looking to attain and the voltage you plan to run.

BTW: Welcome to the forums!

12.25.2009, 03:29 AM

i have a vxl motor on 3s. looking for 40s i guess?

BrianG · 12.25.2009, 04:21 AM

You can use the speed calculator (link in my sig) to try different scenarious, but this is what I got using a 16T spur:

Differential Ratio: 3.25
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 16
Total Voltage: 11.1
Motor KV: 3500
Tire Diameter (inches): 3.25
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor Coil Resistance: 0
Spur/Pinion Ratio: 2.88 : 1
Total Ratio: 9.34375 : 1
Tire Circumference (inches): 10.21 inches (259.34 mm)
Rollout: 1.09:1
Total Motor Speed: 38850 RPM
Vehicle Speed: 40.2 mph (64.58 km/h)
Effective KV Value: 3500
KT constant: 0.39 oz-in/A