Delrin Spur?

[itbvolks]

Anyone rocking a delrin spur?

Been rocking the steel spur for a while but it eats pinions and I'm only using the slipperential as driveline protection.

Anyone having luck with the delrin gear when not slipping the diff heavily?

[BrianG]

Something must be wrong if you are eating pinions. Maybe they aren't hardened, or the wrong geometry (pressure angle)?

[itbvolks]

I guess I should revise my post a touch.

It's not so much eating pinions but there certaily is some wear (spur is clearly harder and shows nearly no wear). This is Mike's mount, his pinions, and the slipperental. I will say there is some run out within my slipper setup which I would assume is attributing some to the pressure variation accross the gear face. At this point, that is what it is and I don't see it getting better.

My other option is to go back to a std center diff and see how things wear. I do like the idea of the delrin spur from a weight reduction standpoint within the driveline. Just wondering if anyone is actually running one and what they are seeing in real use????

[RC-Monster Mike]

The Delrin spur gears hold up exceptionally well - only extremely excessive amounts of slip will cause enough heat to create a problem. we did pretty extensive testing before releasing the Delrin gears. As with any plastic spur, the margin for error is reduced(if you get a loose gear mesh, the plastic spur is the weakest link) - when gear mesh is properly maintained, the cnc'd Delrin gears have a very high load capacity. Tthey are wisper quiet as well.
Regarding the runout - while nothing is perfect, the Slipperential assembly should run pretty concentric. Some possible causes of excessive runout(if this is indeed the case) would be the spring orientation(must avoid stacking the "overlaps" on the springs), or a worn or improperly seated Teflon bushing.

[tedo]

I just ordered one yesterday for my 6T.

It's been 2 seasons on my original spur (still looking good.. a little wear), so when I went to order a replacement, I saw the delrin spur, and figured I would try it.

Racing this weekend, so I will let you know how it works.

[itbvolks]

Originally Posted by RC-Monster Mike

The Delrin spur gears hold up exceptionally well - only extremely excessive amounts of slip will cause enough heat to create a problem. we did pretty extensive testing before releasing the Delrin gears. As with any plastic spur, the margin for error is reduced(if you get a loose gear mesh, the plastic spur is the weakest link) - when gear mesh is properly maintained, the cnc'd Delrin gears have a very high load capacity. Tthey are wisper quiet as well.
Regarding the runout - while nothing is perfect, the Slipperential assembly should run pretty concentric. Some possible causes of excessive runout(if this is indeed the case) would be the spring orientation(must avoid stacking the "overlaps" on the springs), or a worn or improperly seated Teflon bushing.

Mike,

What I think happens on my unit is, when the tension collar is locked down, it actually distorts the alum back plate some. I think it's just a function of my locked down position. Like I said, I'm just looking for some driveline protection so the unit itself is locked down pretty good. With the overlap on the wave springs, I think they pinch some causing the distortion.

Overall, I wouldn't say it's an issue per say. I've been running this since the basic release of the slipperential without issue so clearly it's not causing that much of an issue. On my second pinion.

I do like the idea of reduced driveline mass though. Provided the delrin verison isn't prone to failing. I'm not too worried about mesh issues being the motor/diff is on the same plane so provided the motor doesn't physically move in the mount, it should be fine.

Sounds like the delrin would be/is viable in my application then. Nearly no slip. I temp the diff in the low 100's temp wise (assuming heat soak from the motor). So shouldn't melt. lol

[RC-Monster Mike]

Delrin melts at about 280F, so it isn't prone to melting under normal use(even with moderate slip, temps rarely exceed 150F) - only a mistake is likely to cause failure. :)