calling all losi 8ight T owners
 

my mate nigel has a losi 8ight truggy , 2 of em to be exact . 1 nitro os 28 and other 1515 2.5d

now the question is , does anyones diffs get hot ?

both of his trucks come in toasty , like .. burn fingers toasty , just where the centre outdrive is both front and rear.
this has caused heaps of headaches as it softens the plastic cases and causes the bearing to flew out , changing the gear mesh and stripping gears.

both trucks( brand new ) , 4 blown diffs , all 4 have been replaced to factory specs , and only using 1 , truck so far about 5 battery packs later is going to let go again !!

not happy with losi , just wanna know about any other diff probs

thanks

My best guess is that he may need to use heavier diff oil so that the diffs don't unload as much, or he may need to shim the diffs for a better gear mesh, if the gear mesh inside the diff is too tight there will be a lot of friction, which will result in lots of heat. Maybe somebody with more experience could chime in but that's the only thing I can think of, unless there are binds in the drivetrain. He may need to use heavier oil too? Good luck finding a solution. I haven't heard of anything like this before so I'm thinking it has something to do with how he has his trucks set up.

yea but to both factory built trucks ??? FACTORY PRO ROLLERS .
this has happened since day 1 of purchase

I dont have one, but I have heard this before. I think people are putting some sort of rubber boot over the cvd part of the center drive shaft and filling it with grease of some sort to prevent the heat build up. If you look around on line I think there is even a company that is selling a rubber boot designed specifically for this purpose on the 8ight products

A boot over the CVD part of the driveshaft? The only thing I can think of that might be similar to what you're explaining would be the GMK CVD Condoms (http://www.amainhobbies.com/product_...ducts_id/13168) which aren't to do anything with heat but keeping the pin captive in the CVD.

It'd say it sounds like the diffs are unloading way too much or there's excess friction in the gears as e-traxxer has mentioned.

Shims can cause too tight of a mesh and cause excess friction and heat. No shims can cause friction of the spider gears on the case causing heat - so both having shims and not having shims could be the source of heat. I'd pull the diffs out, clean out any an all fluid, put it back together without fluid or grease and see if it spins freely without binding.

If your diffs are unloading you should be able to tell by the size of tires relative to the other tires when spinning. If the fronts are way bigger than the rears on throttle then you need thicker fluid in the center diff. If the left wheels are way larger than the right wheels when making a left-hand turn, or vica-versa you'll need thicker fluid in your front or rear diffs (or both). A good starting point for truggies is 7/10/5 meaning 7,000 in front, 10,000 in the center and 7,000 in the rear.]

Also make sure the bearings on the diffs are spinning freely. If they're binding they could definitely cause friction that transfers to the outdrives and diffs.

-Jeff