will this work in a e revo?

[offroader]

Thanks for all the help on this lincpimp. Where do we use the 32 pitch pinions? on Emaxx Trannys?

Originally Posted by lincpimp

Revo uses a mod 1 spur gear, so you will need a mod 1 pinion. Pinion size will depend on what batterys you will use. A 12l feigao has a kv of 2048, so 4s lipo or 14 cells would be a decent setup. Using the stock tranny and std tranny gearing, I would suggest and 18 tooth pinion. Then you could vary the spur gear as traxxas makes a 36, 38, and 40 tooth spur. The 18/36 gearing with stock tires will give you about 40 mph. Here is a copy of the speed calc with the numbers I used to find this. I used 4s lipo as the battery, but it is very close to 14 nimh cells voltage-wise.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 2.2941176470588233
Other Ratio: 1
Spur Tooth Count: 36
Pinion Tooth Count: 18
Total Voltage: 14.8
Motor KV: 2048
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0172
Spur/Pinion Ratio: 2 : 1
Total Ratio: 13.05882 : 1
Tire Circumference (inches): 18.06 inches (458.83mm)
Total Motor Speed: 30310.4 RPM
Vehicle Speed: 39.7 MPH (63.78km/h)
Effective Speed Rate: 2.68mph/V (4.31kmh/V)
Effective KV Value: 2048
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...

[suicideneil]

Originally Posted by offroader

Thanks for all the help on this lincpimp. Where do we use the 32 pitch pinions? on Emaxx Trannys?

Generally speaking yes. Since the Emaxx uses 32 pitch gears its easier to use 5mm bore 32p pinions on the motor (such as a Feigao or neu etc). If you prefer though you can get whole new spur/slipper assemblies that use mod1 spur gears, so then you would use the mod1 pinions. Mod1 gears have larger teeth so dont strip as easily as the 32p gears, but its a case of budget/ personal preference and how good you are at setting the mesh really.

[offroader]

Originally Posted by suicideneil

Generally speaking yes. Since the Emaxx uses 32 pitch gears its easier to use 5mm bore 32p pinions on the motor (such as a Feigao or neu etc). If you prefer though you can get whole new spur/slipper assemblies that use mod1 spur gears, so then you would use the mod1 pinions. Mod1 gears have larger teeth so dont strip as easily as the 32p gears, but its a case of budget/ personal preference and how good you are at setting the mesh really.

Thanks for the info on clearing up the mod 1 with 32p pinions who would carry the upgrade kits for emaxx conversion from 32p to mod 1? Do they sell a mod 1 pinion gear that replace the stock 32p pinions on the emaxx.

[suicideneil]

Originally Posted by offroader

Thanks for the info on clearing up the mod 1 with 32p pinions who would carry the upgrade kits for emaxx conversion from 32p to mod 1? Do they sell a mod 1 pinion gear that replace the stock 32p pinions on the emaxx.

http://www.rc-monster.com/gears.php

They have all the different flavours in the RCM shop- MOD1 1/8 bore & MOD1 5mm bore, plus 32pitch 1/8 bore & 32pitch 5mm bore. You can work out the equivalent sizes using the gear calculator:

http://www.scriptasylum.com/rc_speed/_gear_calc.html

For example an 18tooth 32pitch pinion is equal to a 14 tooth Mod1 gear.

[kenkamm]

Hi folks. My First post.

I built myself a E-Revo by using some parts out of my Trex-600 heli. An align 600XL motor (1700kv) and the Align 75A ESC. I used the pistix gizmo to make the aircraft ESC work. I made my own motor mount. I kept the stock tranny and mechanical brake and even the reversing system and optidrive. I built a carbon shelf on the right side which holds 8S A123s. I relocated the receiver, receiver battery, and optidrive to a carbon shelf above the front shocks. Surprisingly the left-right balance works out very well. The truck has lots of power and plenty of run time to keep me happy. Before I geared it down I clocked it at 48 MPH with Proline Road Rage tires on it. I also have a set of Moabs for it and have geared it down to more manageable speed. I really like having the two speed still working because I can do some nice crawling in first gear, then on flatter ground it will kick into second and really take off. I may upgrade to a Neu motor and proper ESC at some point, but this setup works very well and the align motor and ESCs can be found used very cheap… 60-70 bucks for each. Top it off with the $100 Dewalt battery A123 source, and you've got yourself an E-Revo with serious performance for modest cost.

I've found that the airplane-style ESC and 8S1P A123s yield very good performance. I think 2P would be too heavy. I get at least 10 minutes of bashing time with mine, which I think is good enough considering it only takes 30 seconds to change the battery. Better off keeping the truck light IMO.

Cheers,
Ken