Tekno RC EB48 Thread
#6346
Tech Initiate
iTrader: (2)
Joined: Jan 2010
Posts: 24
So my center diff case melted where the planetary gears press against the inner wall.
It clearly let go during an acceleration pass where the front end lifted and front wheels were off the ground, causing "over drive" to the front. So the center diff was working very hard at failure.
Upon disassembly, there were lots of "plastic chunks in the slurry. I'm guessing the diff oil leaked over maybe 25 runs, as it was not full.
So
How many have had this kind of failure?
Is there a recommended disassemble and inspect interval?
Other comments?
It clearly let go during an acceleration pass where the front end lifted and front wheels were off the ground, causing "over drive" to the front. So the center diff was working very hard at failure.
Upon disassembly, there were lots of "plastic chunks in the slurry. I'm guessing the diff oil leaked over maybe 25 runs, as it was not full.
So
How many have had this kind of failure?
Is there a recommended disassemble and inspect interval?
Other comments?
#6348
#6349
#6350
Tech Master
Joined: Oct 2011
Posts: 1,025
From: The 561
I'm still lost. I'll stick with whatever came in my kit. Seems to work fine. I thought i had a good understanding of pistons/oils, but i guess not.
What i was always told was thinner oils = less pack, more/bigger holes = less pack, less/smaller holes = more pack, thicker oils, more pack. I have yet to grasp the concept of how 2 pistons with the same surface area, but differ in # holes, can have a different feel. Also, can't you get the desired "pack" by adjusting oils instead of changing ithout pistons? I understand why you'd change out your pistons if oils starting to get into the high 40's range, but why change them if they have almost identical surface area?
What i was always told was thinner oils = less pack, more/bigger holes = less pack, less/smaller holes = more pack, thicker oils, more pack. I have yet to grasp the concept of how 2 pistons with the same surface area, but differ in # holes, can have a different feel. Also, can't you get the desired "pack" by adjusting oils instead of changing ithout pistons? I understand why you'd change out your pistons if oils starting to get into the high 40's range, but why change them if they have almost identical surface area?
#6352
To add to all of the discussion and throw another HUGE variable into the mix - the height of the holes (thickness of the piston) will have drastic affects on damping characteristics. Unless the pistons are identical in thickness, they can't be directly compared. For example, thicker pistons need larger holes for the same effective damping with the same weight oil. The jury is still out as far as whether a thinner or thicker piston is better.
Carry on...
Carry on...

#6353
Wow...still no pictures of that J-Concepts Finnisher Body yet? The anticipation is killing me. Yes I know that all the Finnisher bodies are pretty much the same, but I really would like to see how it looks on the skinny ass EB48.

#6354
I haven't seen a picture yet either but ordered one. To me it has to be better then the stock body.
#6355
Don't get me wrong I love my EB48, but the skinnyness I'm not a fan of. Right now I'm machining some new mudguards out of delrin at work to make the buggy wider to be able to run some different bodies.
#6356
Got my tekno running today. I bought a nearly new roller, and rebuilt it with 1.2x8 hole and 1.3x8 hole pistons with 350cst front and rear with serpent v2 orange rear springs . I put one pack through it on the track and made some adjustments to the rear camber link setting, and bam! So easy to drive. Unfortunatly it was one of those day when everything is running fine when practicing, the qualifying.....poooo hall sensor goes out on the motor, then my sct410's fan stops working on the esc, and thermaled in qualifying and in the main..... Oh well, Tekno for life now! This buggy is sick...
#6358
Tech Addict
iTrader: (52)
Joined: Feb 2010
Posts: 743
From: oregon
To add to all of the discussion and throw another HUGE variable into the mix - the height of the holes (thickness of the piston) will have drastic affects on damping characteristics. Unless the pistons are identical in thickness, they can't be directly compared. For example, thicker pistons need larger holes for the same effective damping with the same weight oil. The jury is still out as far as whether a thinner or thicker piston is better.
Carry on...
Carry on...

#6359
Tech Addict
iTrader: (52)
Joined: Feb 2010
Posts: 743
From: oregon
So my center diff case melted where the planetary gears press against the inner wall.
It clearly let go during an acceleration pass where the front end lifted and front wheels were off the ground, causing "over drive" to the front. So the center diff was working very hard at failure.
Upon disassembly, there were lots of "plastic chunks in the slurry. I'm guessing the diff oil leaked over maybe 25 runs, as it was not full.
So
How many have had this kind of failure?
Is there a recommended disassemble and inspect interval?
Other comments?
It clearly let go during an acceleration pass where the front end lifted and front wheels were off the ground, causing "over drive" to the front. So the center diff was working very hard at failure.
Upon disassembly, there were lots of "plastic chunks in the slurry. I'm guessing the diff oil leaked over maybe 25 runs, as it was not full.
So
How many have had this kind of failure?
Is there a recommended disassemble and inspect interval?
Other comments?
Oh and don't feel bad, some people melted there cases during break in...the new diffs don't require break in.
#6360
The updated diffs aren't faulty like the originals that should have been trashed...its an expensive fix. After the good arms, springs, pistons, servo horn, new diffs, new servo saver sporing and some random sanding she'll be a champ...
Oh and don't feel bad, some people melted there cases during break in...the new diffs don't require break in.
Oh and don't feel bad, some people melted there cases during break in...the new diffs don't require break in.



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