Rear motor mounts

Digger

Digger

R.C. Alley
The rear motor mount has 3 sets of holes on the E-Revo. One set is for very large-can motors and has bigger holes for larger screws. One set is for regular motors and one set is for a "low CG" setup, according to the manual. The stock 550 titan comes mounted to the regular holes. The "low CG" holes lower the rear motor a little more than 1/8", but as I found out tonight, the stock 550 titan doesn't fit in the low holes, the bushing collar of the motor can is just a little too large to allow the motor to fit all the way to where the screws will line up with the holes. I did a little "creative dremeling" and removed just a slight amount of material on the mount to allow the motor mount screws to line up through the low CG holes. The amount of material removed was so slight, I doubt if there was any structural weakening caused.

However, when I tried to install the mount back into the truck, I discovered that the upper screw hole that secures the mount to the motor plate no longer lined up with the slot in the plate. The 18 tooth pinion(one tooth SMALLER than stock) I was using was too large with the stock spur to allow the mount to swing in far enough for the screw holes to line up. If I went with a smaller spur or smaller pinion, then I could use the "low CG" mounting holes, or I could creatively dremel the motor plate to enlarge the slot, but it looked like there wouldn't be enough material left outside the screw head for me to be comfortable with.

I'm happy with my gearing right now, I don't have any other spurs and only larger pinions to change to right now and I don't have a spare motor plate to go hacking this one up just to see if it would work. So I put the motor back into the regular set of holes, reinstalled the motor and mount and called it a day...

But I DID neaten up the motor wires some! LOL!:tmb
 
Digger

Digger

R.C. Alley
Not without tearing the truck apart again! LOL! The piece I shaved was the heatsink rear motor mount. The center hole that the pinion shaft goes through is egg or pear shaped. I just opened up the narrow end of the hole a little.

Here's the part:



You can see the pear-shaped hole with the narrow section pointing up...
 
Digger

Digger

R.C. Alley
Here's what I did:



The yellow holes are the Large motor mounting holes
The blue holes are the regular motor mounting holes
The green holes are the "low CG" mounting holes
The red shows where I dremeled just enough for the motor holes to line up with the "low CG" holes.

Keep in mind this WONT WORK with the stock titans and stock gearing! You will need a smaller spur, smaller than 18 tooth pinion or possibly both to mount a 550 titan this way. You might also need to enlarge the slot on the blue motor plate as well...
 
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4

4wdmt

Well-Known Member
Nice. Thank you for the illustration and detailed description. It just makes sense to put the motors as low as possible. I am just wondering why traxxas didn't design it "stock" on that manner. I was about to test putting it to low cg position, but I guess there is too much hassle.

Thank you.
 
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