Direct Drive to Diff E Revo Build

[sikeston34m]

Sorry, No updates in awhile.

I'm going to install the 13/43 Hot Bodies gearing in the Revo diffs. The Custom Wye Wind performs almost like it's undergeared on the 10/43 gearing. (which doesn't hold up btw)

So I'm gonna trade the 4.3:1 ratio for the 3.3:1 ratio. I believe the Custom Wye wound 4130 will still start just fine. And IF it doesn't, I believe the Kontronik Jazz will. I just learned that they are very smooth with outrunners.

I've really been watching/waiting for Tower Hobbies to get the 2 speed kit in the for E maxx. I was gonna put all of this into one order. BUT they just bumped the "delivery" date up to Late Feb. *Sigh*

[JERRY2KONE]

Yea it sucks when they do that, but we all know it is due to some delivery issues beyond their controls. Some items go on for months like that, because they cannot get the items from their suppiers when they would like. We are all still looking forward to hearing about your testing with this one Sikes. Thank you for sharing it with us.

[its me]

Originally Posted by sikeston34m

Sorry, No updates in awhile.

I'm going to install the 13/43 Hot Bodies gearing in the Revo diffs. The Custom Wye Wind performs almost like it's undergeared on the 10/43 gearing. (which doesn't hold up btw)

So I'm gonna trade the 4.3:1 ratio for the 3.3:1 ratio. I believe the Custom Wye wound 4130 will still start just fine. And IF it doesn't, I believe the Kontronik Jazz will. I just learned that they are very smooth with outrunners.

I've really been watching/waiting for Tower Hobbies to get the 2 speed kit in the for E maxx. I was gonna put all of this into one order. BUT they just bumped the "delivery" date up to Late Feb. *Sigh*

Well keep up the good work man! im learning alot from reading your threads

[sikeston34m]

Originally Posted by its me

Well keep up the good work man! im learning alot from reading your threads

Thank you.

I placed the Tower Hobbies order for the 3.3:1 Regular cut gears.

I believe I can get this to hold up as long as I use them. They will side load the pinion bearings instead of loading them like a thrust bearing does.

[sikeston34m]

Ok, it was as I suspected. The Pinion side bearings center race was punched out from the load. The other pinion bearing appears to be in fair shape.



I have a pretty good feeling about these new gears. The ring looks alot tougher compared to the old one.


Here's where the difference is! Notice how these pinions compare? I like how tough the new one looks. The teeth are much bigger and straight cut. I think this has a chance. LOL

[lincpimp]

The spiral cur bearings are a good idea, they should last longer than a strait gut gear, as the teeth are in engagement more than on straight cut gears. The bearings need to ge conical like a full size car, and they need some sort of preload, like a crush sleeve. Most likely would be too big to work well in the space available.

Good luck with the straight cut gears, hopefully they will treat the bearings better than the spiral ones did!

[sikeston34m]

Originally Posted by lincpimp

The spiral cur bearings are a good idea, they should last longer than a strait gut gear, as the teeth are in engagement more than on straight cut gears. The bearings need to ge conical like a full size car, and they need some sort of preload, like a crush sleeve. Most likely would be too big to work well in the space available.

Good luck with the straight cut gears, hopefully they will treat the bearings better than the spiral ones did!

Yes I think the spiral cut bearings are a good idea too. The only downfall is the lack of the correct bearings to work with them. (Please keep in mind that for a regular setup using a slipper, and/or a center diff, the spiral cut gears would work great)

I got the 13/43 gears installed. I took the Revo outside to give it a test spin as best I could. They are going to work!

First I tried it on 4S. Much to my surprise it doesn't cog. It does feel like the ESC tries to run off and leave the motor if you just stab it though. (too fast of an acceleration rate in the programming I think) If you ease into the throttle, it runs VERY good. Top speed is MUCH better and the Wye Termination has the torque to pull it to some great acceleration.

Then I had to try it on 6S. The issue that I spoke of on 4S is gone. This is going to be hard to control. It's got some crazy power. I can't imagine what the top speed is going to be, But it hauls! It will wheelie at speed too.

I couldn't get too much into it because it's very dark out there. LOL

I believe these gears are loading the bearings the way they were meant to be. I think we're there.

I'll try to get some video's tomorrow.

[sikeston34m]

Ok, the next weak link that I see is:

Is there a set of Revo Diff to Wheel cvd's that are compatible with the regular Hot Bodies Diff cup?

I have the RCM 6mm conversion shafts installed. These allow me to use the Revo Driveshafts from Diff to wheel.

I'm twisting them like a Barber Pole. The hardened steel pin that secures the Revo Shaft to the Diff is elongating the hole. The flat part is twisting. This will eventually give way to metal fatigue.

On 6S, I'm going to need some tough cvd's on the rear. I think the Hot Bodies diff cups may be stronger since there is more steel there. That is, IF I can locate a Revo cvd that will work with them.