Ran a 1/12th today since the 2007 ROAR Reg.'s and I definitely have to bring it back out.....just don't know when though

Make it soon dude. Your 1/12th buds miss you

Yer such a tool. I have a bridge I'd like to talk to you about

Actually, I would give a try to anything Brian makes cuz he's real smart.

Hey OD . . . coming on Tuesday? Missed you last week . . .

I would really like a set of those wheel washers . . .

What do you think about this . . . previous post . . .

"Diff ball holes on the Kimbrough spurs . . .

I was wondering if anyone runs extra diff balls in the spur, like some extra on the inner ring of holes to sort of distribute the load more evenly?

Thoughts?"

I wouldn't run the inner & outer ring of holes due to the diff ring may flex just enough that you will only pick up the inner ring of balls, leaving the outter balls just going for a ride. Then again, it may work fine. You will just have a heavier diff packed with balls. If you are having slip issues, I suggest picking up one of my thrust kits and put that issue to rest.

bb

Yeah I was looking at the thrust kits. Do you have a website?

I was thinking with more diff balls one could lower the clamping force of the assembly making the bearings work better and last longer . . . just a thought. All these extra holes . . .

I run as many diff balls as possible. Even if the diff ring does flex some of the pressure will still be distributed across all the balls, flexing or not. This does allow you to run less tension to get your desired diff setting. The one problem I have noticed though is that diff rings, being stamped, are rarely flat from inside to outside. A bit of sanding fixes that though.

God knows ONE of the three of us has to be and, apparently, it sure as hell ain't you or I...

Then again, after Sunday there's only Multi-variable Calculus between me and that math degree. Look out 8th grade math students...Mr. Smith is coming to a classroom near you. Fall '08 release date.

I don't think you want to elevate me up on a pedestal. I like to think that I cleared the bar at high school, but sometimes I think I just hit my head on it.

Kids! I've seen Scott's text books. Just one word...... "run!"

Trust me, build your diff with one of the Slapmaster thrust bearings. Once set, you'll never have to touch it and it'll last like you wouldn't believe!! Great stuff.

I'm really busy with work, not sure if I can make it Tuesday. I'll try to get down there and give you those wheel washers.

I always run 12 diff balls, for the reason you stated. I use PRS spurs and they only have the one ball circle. I agree with your theory but I don't know if the extra balls will make a significant difference

OMG I'm so glad I'm not in school any more. Congratulations Scott!

Thats not true I'm gonna school ya in mini!

About the diff rings being flat, I was thinking if I keep the rings in the same place in the diff all the time and get some nice smooth grooves worn in them wouldn't that take care of the flatness issue and increase the surface area so the diff is "grippier" . . .

Everyone at the track says, "Oh those are grooved pretty bad, you should switch sides/them out."

?

Grooves in the diff rings aren't always all that bad but I always sand them off when I rebuild the diff. Sanding is the only way to get the rings flat (short of a machine shop).

I never run the inside and outside row of diff balls in the Kimbrough gears. It always seems to make my diff act all funny. I don't know if it's the extra drag of so many balls or that the inner balls turn slower than the outside balls. I just don't like both rows.

On a side note, I'm finding that the rollouts that Novak has on the site for 12th are a little "conservative". Ok, a lot conservative. So I've been working on a little spreadsheet to give a better starting point for 12th (and a GTB) based on what I was running at CEFX and a couple times at Grand Rapids. The chart is based on KV ratings so it might work with some of the other motors but I haven't tried many of them yet. I need to run a little more mod this year to update the mod side (I am the master of thermalling the speedo).

The sheet's just a starting point and you should check the temp but gear for LAPTIMES. Temp is just for safety. (the 21.5 rollout was just a curve fit I didn't run it)