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Axle drive shaft keeps

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A

auhutchi

Gone - bye bye.
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I was running my car last night. Ran fine for about 3 tanks. Then I went off a little 2 ft jump and broke my rear drive shaft- Where it connects to the pivot thing by the differential. Once I fixed that i ran it around a little making sure everything else ran fine. It ran fine. Then i was jumping it again on another 2- 3 ft jump. After about the tenth jump one of my front drive shafts snapped in two. I started thing something was wrong breaking drive shafts like this. All at once. So once i got it fixed i went through a real good inspection. I checked make sure it wasn't binding, twisted, loose screws, everything moving freely, everything was fine. So i ran it again did a few minutes of real gentle driving(no jumping) then i started to jump little jumps again and it broke like the first one did but on the front. Now does any one might know why this is happening because i can't afford 8-12 dollars for every time i go jump it or wreck it. It starts to add up. 3 drive shafts in 20 minutes.
 
My shocks or springs are great- dampners have't moved and it acts the same.

It might be slipper clutch but how does it tighten up on its own
 
it doesn't tighten up on it's own, it's probably too tight to start off with and your driveshafts are just now beginning to show signs of wear, as a matter of fact, if your slipper is properly adjusted you can run a BB for at least 10 gallons and not have driveshaft problems, IF it's properly adjusted
 
I have saved many a broken parts by running a fairly loose slipper clutch. A lot of guys here like the super quick hook up off the line and pulling wheelies so they tighten the hell out of the slipper clutch...to the point it's not even worth having one and are always breaking. Slipper clutches save more than just your shafts....the impact of the wheel is allowed to pass through the rotation of the drive train and slip through the clutch instead putting that extra strain on your control arms and fatiguing them. I keep mine just tight enough to not rev through the clutch. I know I'm too loose when I hear the engine winding without shifting where it should. When I bring it back in, I check the back plate for heat. If it's hot, I know I'm slipping too much. If it's working right, it will slip a little when your drive clutch hooks up as well as during shifting not to mention landings sudden stoppage. Loosen it up some and I'm sure you'll see a huge difference. If you can't hold the back plate still and turn the spur with a firm finger, you are probably too tight....not taking girly hands into consideration.
 
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When your landing, are you on the throttle? If so, that combined with a tight slipper will break stuff.

Are your axle bearings all good? If they are getting sloppy, it may let the axle move to an undesired angle which could put extra pressure on the axle yoke and snap it.
 
olds97_lss said:
When your landing, are you on the throttle? If so, that combined with a tight slipper will break stuff.

Are your axle bearings all good? If they are getting sloppy, it may let the axle move to an undesired angle which could put extra pressure on the axle yoke and snap it.
Click to expand...

thats what i was thinking also
 
Alright there was a bearing missing but i replaced and i'm still breaking shafts. I have slipper clutch on the loose side and i jump it and land about half throttle. This weekend i broke another 4 shafts. It seems like the shafts are twisting to break. I think this is because i reinforced all the ears with steel and the shaft is twisting over the rivets inside the shaft then breaks in the center. I want to put steel axles on but then i probably screw up a differential. I finally got about 2 tanks through it with a few jumps and it hasn't broke yet. I'm hoping what ever was in a bind broke loose, if not i'm thinking about pulling the car into pieces and putting it back together so i know if something it binding, or broken
 
i have had an old nitro sport and it was old and beat. I have had newer electric ones but this revo is basically my first nitro car that isn't held together with duct tape. I am a diesel mechanic so these little cars are something different than nuts the size of your fist
 
Ok the reason you are breaking driveshafts is due to your own technique. If you are landing at half throttle then no matter how loose the slipper clutch is its still going to be engaged not letting the clutch slip.
An example would be a race car in the pit with the rear tires off the ground. The crew chief says go go go and the driver dumps the clutch and romps the gas just a fraction of a second too early before the jackman has the rear tires on the ground. When the rear tires hit the ground the force is too much for the axle shafts to overcome(sudden shock load) and the shafts snap. This is what you are essentially doing. And if your landing on flat ground then you will continue to break shafts. So when your in the air and watching what the truck is doing and see the front end is nose down just give a quick jab of the throttle. When i am jumping my revo i never land with the throttle more than 1/4 throttle. i try and land with no throttle but most of the time its 1/4 throttle.
 

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