What would cause this?

[lincpimp]

Also keep in mind the pinion spins much more than the spur does. So even if the material on both was identical the pinion would wear faster. Say you run 13/46 gearing, the pinion rotates 3.5 times more than the spur. So hardened pinon needs to be many times harder than the spur to survive...

[brushlessboy16]

Originally Posted by lincpimp

Also keep in mind the pinion spins much more than the spur does. So even if the material on both was identical the pinion would wear faster. Say you run 13/46 gearing, the pinion rotates 3.5 times more than the spur. So hardened pinon needs to be many times harder than the spur to survive...

very true linc, but that was after only 20 minutes of running

[Patrick]

Originally Posted by brushlessboy16

very true linc, but that was after only 20 minutes of running

I had a non hardened pinion with a plastic spur for a couple of months with very little wear. One night at racing my mesh slipped a bit and melted the spur. My only spare spur was a steel one, so I decided to use it for the last race which is only 5 minutes. After 4 minutes the pinion had no teeth left at all and my car had no drive.

[What's_nitro?]

Absolutely.

[BrianG]

Gotta watch out for those left teeth!

[riceman]

This is why balance is very important! This happened to me when I had my motor and battery both mounted on the left side.

[hemiblas]

This is the reason I stopped doing brushless conversions on nitro vehicles. I have had different MT's with all the same results. The pinions only last 1 to 4 runs. I have tried a variety of pinions and its always the same. The hardened ones just last a bit longer but the pinion always gets eaten by the spur. You might try some of the gear oil to help with the friction and that might make them last longer. I just gave up and bought an emaxx. Metal pinion and plastic spur is the way to go. Plus the metal on metal causes radio interference, unless you are running 2.4gig that is.

[lincpimp]

Originally Posted by hemiblas

This is the reason I stopped doing brushless conversions on nitro vehicles. I have had different MT's with all the same results. The pinions only last 1 to 4 runs. I have tried a variety of pinions and its always the same. The hardened ones just last a bit longer but the pinion always gets eaten by the spur. You might try some of the gear oil to help with the friction and that might make them last longer. I just gave up and bought an emaxx. Metal pinion and plastic spur is the way to go. Plus the metal on metal causes radio interference, unless you are running 2.4gig that is.

Just run the plastic kyosho spur gears. I run them on all of my buggies and have not had any issues...

[brushlessboy16]

I dont have any problems with interference with my m8(spektrum).. i threw my hardened 15t pinion on and its doing fine after 2 packs