larger Pinion or smaller Pinion... Slower wear???
 

As some of you know... i have been having serious pinion problems wearing out within 4 lipo packs...

Now i am considering increasing my pinion size from 17-18t to 22t-23t pinion

Obviously my top speed would go way over what is recommended blah blah blah, but its all good as my truck is currently locked in 2nd gear, so what i will do is lock it in first gear which should also allow the truck to acclerate quicker and hopefully take the strain off the pinion so much and the gear box hopefully...

My gearing currently is 17/47 /39 tranny ratio = 1.5366847826086956
i will goto 23/44 /44 tranny ratio = 2.215277777777778
Gd idea???

My suggestion is to figure out the cause of the wear cause I have never worn out a RC-Monster pinion!

Everyone keeps saying this... I know why i have worn it out...Because there is too much stress on it...

My Extra legnth, weighing 14-15lbs and having the motor up front to prevent wheelies, means all my power goes to the ground. And this is causing wear on the weakest part which is my pinion.

I want to reduce wear, and iheard that increasing pinion size means less wear on the pinion?

A larger pinion should wear slower, it's spinning fewer times but it's not going to make much of a difference IMO. If your wearing out a pinion in say ten packs then the larger one may last 12.

another reason i think my pinions are being eaten, are because my 47t metal spur is quite a thing one compared to my stock 44t spur. Which means less contact area. This is why i want to install this plastic spur i have which is thicker and better contact area.

like i said in your other thread, the plastic spur is very thick and you should be very happy with it because as long as the gear mesh is good (a little tighter than steel spur) you should not have any problems with stripping it or breaking teeth. it is just weak enough to break on a really bad on-throttle landing and will protect your tranny from broken gears. i am still on my original plastic spur after 40 very hard runs.

There is also Mikes slipperential that would help.

Well, i should have the plastic spur on by this weekend, and i will be able to test it.
Bryan... The savage uses a tranny... but i was considering his slipperential for when i do my centre diff mod...

scarlett... i ordered a stock HPI Spur to test first... but should i be looking at any others such as delrin etc??? thing is i cannot find them. Could you point me in the right direction?

This sounds like a pressure angle issue...?

Have you confirmed that you're running the same pressure angles in both spur & pinion

ooo this is new to me... Pressure angle?

What exactly do you mean by that? Do you mean that the pinion and spur are perfectly parallel to one another rather than possibly having a bent motor mount plate causing imperfect even wear?

If thats what you are getting at , then no.. there is no angle.The wear is even and nice all the way around the pinion.

http://blog.makezine.com/upload/2010.../figure001.jpg

From memory Mod1 is available in 14.5, 20 & 25 degree pressure angle...someone may have better knowledge than me but I think that's correct

hmmm if it was a pressure angle issue then that must mean all the various pinions i have tried and failed are not able to work with my current spur??? Maybe my spur is at fault???

Ya think!!! No one else has had issues wearing out all kinds of pinions. When someone does wear out a pinion it's because there's something wrong or something comes loose