Heat Treated Diff Cups

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Sprint 77

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I got back from the heat treaters today. He said the rockwell was 57 on the diff cupps and that was to hard so I am having them tempered to 700 deg. so MooMan you did the right thing with the torch heat up.


I should have mine back this week.
 
Yep, finally we have the low down, a simple cure for a frustrating problem, now I just need steel a and b gears and my ramp will be totally (I hope) mooproof....barring the inevitable bad driving induced poorpoors:rolleyes:
 
Yeah, great news.......I'm not breaking difcups anymore.......I'm snapping dogbones now.......that stupid 77DOM is costing me a fortune.......that's it, I'm going back to the 23cc and stock can!!!!!!.......NOT!!!! :D
 
mooman007uk said:
Yep, finally we have the low down, a simple cure for a frustrating problem, now I just need steel a and b gears and my ramp will be totally (I hope) mooproof....barring the inevitable bad driving induced poorpoors:rolleyes:
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The day I get my steel A/B's in I'm gonna throw some steaks on the grill and down me a 12 pack in celebration.
 
Piranha2 said:
Yeah, great news.......I'm not breaking difcups anymore.......I'm snapping dogbones now.......that stupid 77DOM is costing me a fortune.......that's it, I'm going back to the 23cc and stock can!!!!!!.......NOT!!!! :D
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I haven't done a dogbone yet but I'm sure it will come...maybe they want some tempering too if they seem to be a bit brittle


I'm feeling a bit sorry for my TT with a ONB 28.5 reed ported motor, 813 and 77dom. still waiting on a few parts and for the 4130 tube to arrive for the cage before I can get it running:( but it's gonna be nuts
 
Torch it

mooman007uk said:
use a plumbers torch and heat them, start at the tip and chase the blue up to the cup and then let cool, job done
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So no dunking in water ? I was told bring up to the red zone, dunk in water , then heat and chase the blue !! Every time I am out bashing I break the cup, not good !!
 
I've got an oven at work that will go up to 2000 degrees. Do I just put them in there at 700 for a while, then just pull them out?


If thats the case you guys can send them to me and I'll do them for you. Just send a package with your postage on it.
 
Sprint 77 said:
I got all my metal parts toasted dogbones and all, they were up around 56--57 rockwell also . Yeah guys horsepower costs $$ even in RC LOL
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What about the dogbone, they raise the rockwell or they lower it like the diff cup ???


because the original dogbone seem to be too flexible...
 
lumax said:
What about the dogbone, they raise the rockwell or they lower it like the diff cup ???
because the original dogbone seem to be too flexible...
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Lowered it as well , He said my parts will have some characteristics like spring steel. I am not sure if this will be better oin dogbone , but it should be easier on drivetrain , Time will tell.
 
Piranha2 said:
Yeah, great news.......I'm not breaking difcups anymore.......I'm snapping dogbones now.......that stupid 77DOM is costing me a fortune.......that's it, I'm going back to the 23cc and stock can!!!!!!.......NOT!!!! :D
Click to expand...
Ditto again today, but for good reason.......landed a good size jump on the rear axle and tried a Gas Jockey wheelie that turned into a cartwheel. Then front wheel drive all the way back to the car........just to reach in my pocket to find a spare dogbone....... :mad: ......I swear I'm my own worst enemy!
 
I have the 5B SS HD 6mm's all the way around, yeah I have to get the wifey to sew me some straps! Hey, you must of had a spare dif case from your upgrade kits, right? If not I have 3!
 
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