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Old 05-10-2013 | 06:03 PM
  #6346  
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Angry Melted center case

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?
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Old 05-10-2013 | 06:20 PM
  #6347  
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im with rockthecatbox21, this is way to much info for me to process,guess im too old to handle all this.....lol
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Old 05-10-2013 | 06:53 PM
  #6348  
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Originally Posted by ChrisAttebery
The original 10x1.1s had too much low speed dampening, so Tekno advised to drill them to 1.2. Those had too little pack, so people started trying 8x1.3. That seems to be the sweet spot for this car.
This says it all as far as I'm concerned. By low speed dampening he's also saying the greater # of smaller holes "10x1.1" will pack up to quickly causing the car to feel lazy. 10x1.2's fix that but gain chassis slap. I don't have the 8x1.3's handy so going to try drilling 5 of the 10x1.1 holes out to 1.2 and should be really close to the 8x1.3's.
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Old 05-10-2013 | 06:58 PM
  #6349  
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Originally Posted by jlfx car audio
This info is what keeps everyone ? Everything .
This info u present is incorrect .
When I first asked about pistons a few pages back I was also misinformed and agree that if one doesn't kno for sure then to PLEASE leave the answering to someone who is.
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Old 05-10-2013 | 07:17 PM
  #6350  
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Originally Posted by Rockthecatbox21
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?
You and I are in the same boat. That's always been my understanding and my experience. I tried a friend's buggy with white 8x1.2, mine with the black 8x1.2, and stock 10x1.1. Oils were all 30r/35f. The stock slapped the hardest, followed by the white (barely slapped), followed by the black (didn't slap).
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Old 05-10-2013 | 07:37 PM
  #6351  
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Default Eb48 shock tools

Hi guys I just received the shock tools by chris and I have to say they are great a pleasure to use and makes rebuilding the shocks so much easier
Good job chris
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Old 05-10-2013 | 08:40 PM
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Originally Posted by teknorc
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...
thank you. thats all we needed. hahhahahaahhah i got mine pretty much ready for some podium pics
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Old 05-10-2013 | 10:42 PM
  #6353  
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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.
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Old 05-10-2013 | 10:54 PM
  #6354  
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Originally Posted by GrimReminder
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.
I haven't seen a picture yet either but ordered one. To me it has to be better then the stock body.
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Old 05-10-2013 | 11:05 PM
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Originally Posted by tschenck
I haven't seen a picture yet either but ordered one. To me it has to be better then the stock body.
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.
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Old 05-10-2013 | 11:34 PM
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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...
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Old 05-11-2013 | 03:00 AM
  #6357  
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Tekno for life. Sounds good.
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Old 05-11-2013 | 10:16 AM
  #6358  
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Originally Posted by teknorc
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...
This is also why some pistons have there holes drilled at an angle...makes the hole deeper without needing a thicker piston.
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Old 05-11-2013 | 10:24 AM
  #6359  
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Originally Posted by mointr
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?
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.
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Old 05-11-2013 | 11:11 AM
  #6360  
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Originally Posted by streetsports
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.
Ummmm, my original eb48 diffs are fine. No leakage and everything works fine. Good arms? Don't need em', just don't drive like an arse. Stock springs? They're fine too. Stock pistons? They work great for me. New servo saver spring? Don't need that either, stock one works fine. Sanding, yes i did have to sand the shock parts from the tree. Servo horn, yeah it is a good insurance item to have. I run the ofna one, but my buddy has run the plastic stock one ever since he got his, with no issues whatsoever. The tone of your post is kind of passive-agressive in the fact that you make it seem like it has a lot of problems that need to be fixed, which it doesn't.
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