BL Revo using Revo Transmission?

[BrianG]

Originally Posted by crazyjr

Looks good. I hope you got a motor that will pull the wide second gear, because it will be high geared. In that instence i would've used the close ratio. Good luck

Actually, in second gear with the wide ratio set, the revo tranny ratio is 2:111 (38T/18T). The e-maxx in second gear is only 1.722 (31T/18T). The ratio for the revo standard ratio set is 2.29 in second gear - so it's even less.

Emaxx: 2.846 diff x 1.722 tranny (gear 2) x 51T/14T spur/pinion = 17.852958:1 total reduction ratio.
Revo: 2.846 diff x 2.111 tranny (gear 2, wide) x 40T/14T spur/pinion = 17.16544:1 total reduction ratio.

[starscream]

So, what does the motor mount look like?
All you need now is a center diff to finish the tranny:027:

[BrianG]

Originally Posted by starscream

So, what does the motor mount look like?
All you need now is a center diff to finish the tranny:027:

Well, I haven't started that yet. :dft001: I'll have to work on that once I get a hold of a BL motor, but I suppose I could use a cheap brushed motor to at least get the design worked out. I have no clue yet as to how I will implement it, but I'm shooting for using parts of the stock Revo motor mount and working from there (because it already has an adjustable mount for changing spurs and pinions). The final version will probably have to be machined for accuracy, and I don't know where I'll get that done.

This started because I was waiting for my tax refund and now for my order from Mike to arrive to finish my current E-Revo, so I started thinking about how to use a Revo tranny to allow braking and reverse. Once my current E-Revo is done and working, I want to build another lighter one of a different design and see which I like better. I also want to use more stock parts (like center shafts) so I can pick up replacements at my LHS instead of trying to order or fabricate something that'll work. The only other part I have right now is a chassis. I should be able to move most of my existing E-Revo parts to the new design and maybe sell the one I don't like as much. The next design might even use Lipos.

I don't plan on ever using a center diff. I don't race so it's not needed IMO. I seem to enjoy building these than driving them, but unfortunately cash is not over abundant in my household.

[crazyjr]

Originally Posted by BrianG

Actually, in second gear with the wide ratio set, the revo tranny ratio is 2:111 (38T/18T). The e-maxx in second gear is only 1.722 (31T/18T). The ratio for the revo standard ratio set is 2.29 in second gear - so it's even less.

Emaxx: 2.846 diff x 1.722 tranny (gear 2) x 51T/14T spur/pinion = 17.852958:1 total reduction ratio.
Revo: 2.846 diff x 2.111 tranny (gear 2, wide) x 40T/14T spur/pinion = 17.16544:1 total reduction ratio.

cool. I don't think that far into my projects

[BrianG]

Originally Posted by crazyjr

cool. I don't think that far into my projects

Well, when you're stuck looking at unfinished truck because you're either waiting for parts or cash for some parts, you have time to think. :)

[Sylvester]

Originally Posted by BrianG

Well, when you're stuck looking at unfinished truck because you're either waiting for parts or cash for some parts, you have time to think. :)

OR you can think of ways to make more money:)

[BrianG]

Quick question: I was reading this thread about what "Mod1" pitch meant and it sorta answered my question. I understand it is metric, but is it 1mm? So, does that mean it will work with stock Revo spurs since those are 1.0 metric pitch gears?

Guys I ran into the same problem, I am trying to shrink down pics but I have them posted on my website, I will shoot pics of the individual parts this weekend. I can make the individual parts available, too

www.eaglesviewaerial.com/products.html

I just posted this to RCU the other day here is the relevant exerpts...

Since I have a small machine shop (2 cnc mills and a cnc lathe), I set out to build a BOLT ON KIT for the Revo that could be sold for less than 100 dollars in a retail setting, that would allow for a brushless drop in conversion.


To solve the gearing problem, after some messing around and searching, I found a suitable SAE pitch gear that Associated makes, and quite incidentally, it has three molded holes that were almost a perfect match to the 120 degree bolt pattern on the slipper!
So we keep the slipper (good thing), and now I had to just machine an adapter/spacer to get the gear mounted flat, (after 3 or for stripped gears I finally got one machined/sized correctly and now it is solid).

I had to lock the reverse shifter, very simple, a nicely bent piano wire and a bolt took care of it. Getting a good gear ratio (similar to the Emaxx overall G/R on a Novak system) using the stock gear box again, cheap and bolt on requires a lock up device on the second gear stage. I machined an ALU replacment hub for the second gear gearing that replaces the stock one way bearing hub that goes through it. Then you just ditch the first of the two stages of gearing, and use the lock hub so that electronic braking from the motor would work Viola! Works like a Charm!

Problem 2: Motor mounting
So I started with a hybrid motor mount of carbon and aluminum, the carbon gave too much flex and I went to an all aluminum machined two piece motor mount which allows gear ratio and mesh adjustments. (Older carbon verticle mount shown in pictures, I will shoot pics of the newer one this weekend)

Designed some simple and stiff carbon fiber trays that bolt into stock bolt holes on the chassis for the battery and ESC, and its done.

Performance:

Holy cr*p! I ran a 14 cell (cheap 3000mah NiMHs) and 4s2p TP Lipolies and it will wheelie on any surface even easing into the throttle, and is visibly faster than the nitro setup I had on my stock revo. The verticle CG remains very much the same, so the handling of the truck (other than off the line grunt which was not even close in the nitro setup) is very much the same. I went to stiffer springs in the rear to better support the battery weight and keep the ride hieght higher for my personal bashing terrain.

Price: The conversion kit is 74.99 retail, I am offering direct orders on www.eaglesviewaerial.com/products.html The only things you need to complete are BL motor, batteries of your choice, and a 14-19t pinion gear from Traxxas (from the Emaxx line). If you want to buy individual parts such as the lock up hub and gear mount for the associated gear, I can sell those individually, just call me directly.


Compared to well over 600 bucks for a complete gorilla max conversion, this offers a nice relatively cheap alternative.

Ok ok, pics, I can't post em because I took them in high quality format and don't have any of my image tools with me, check the website for detailed pics.

PLEASE NOTE THAT THE CARBON PORTION OF THE MOTOR MOUNT IN THE PICTURE IS NOW ALUMINUM....
(sorry, been out of town, need to shoot pics of the new mount piece).

I will post videos of it shortly, check my website for more details....

If you have any questions, please feel free to call or IM or email...
847-778-0874, (for IMs and email check profile).