Are you NUT'S or just stupid?!

[drtrkr244]

It was explained to me that, under full rearend wrap-up, you wanted a small degree difference between front and rear u-joint angles. That keeps the needle bearings loaded so that they constantly are turning and not wearing in one spot.

Plain and simple.....the chassis mfgr's know this, that is why they tell you to run a certain pinion angle!

[fastford]

no one here is wrong with there thoughts on this, but there's a lot of other variables to consider, especially with the amount the lift bar or pull bar travels. I have ran 6 degrees of actual downward angle on the rear pinion with no problem, so I guess spicer would call that 12 degrees, of course this is static, under full load it might not be but 3 deg or 6 according to there formula, one thing to be careful of when playing with pinion angle and a lift bar type car is what happens when braking , you will gain angle with a 6th coil set up and if your on the ragged edge it don't take much.

[LM14]

The IMCA sanction does not allow anything but a steel or aluminum driveshaft. I don't have a problem running one with a standard style yoke like we did on Brinns but wouldn't even look at a ball spline if you couldn't run fiber.

SPark

[LITE-INN]

carbon fiber is sasafer correct so why not use one

[lovinlatemodels]

I have always run a steel drive shaft with a ball spline made from Wiles and never had any problems did this for 13 years of racing maybe it is wrong set up and in proper maintenance that's is causing the problems I know some people like to stretch there equipment longevity way to long.

[hpmaster]

I have always run a steel drive shaft with a ball spline made from Wiles and never had any problems did this for 13 years of racing maybe it is wrong set up and in proper maintenance that's is causing the problems I know some people like to stretch there equipment longevity way to long.

Funny you mention a steel drive shaft because I was called by my friend in our weekly post racing call this morning and he said that guy has put a steel driveshaft in now.I was told this guy has broken 2 drivelines in one month. The first was a driveshaft the second was the yoke/output shaft of the transmission. This indicates to me a very likely improper driveline angle, as breaking a driveline twice in a month is most likely more than bad luck and at very least not inspecting all parts the first time in my mind. I hope that steel bad boy doesn't get loose and fly around.

[hucktyson]

I don't understand why people run ball splines ... Plenty of Crown Jewels are won without ball splines and the potential driveshaft tearing the car up issue .

[drtrkr244]

I have never broke a driveshaft in 25 years of dlm racing. I consider some of that is luck but the majority is good maintenance. Also, I only used Spicer u-joints not the el cheapos at the local auto part stores.

[fastford]

I don't understand why people run ball splines ... Plenty of Crown Jewels are won without ball splines and the potential driveshaft tearing the car up issue .

I never understood it either, I looked at them when they first came out and realized how much extra maintenance was involved compared to the little performance gain I could see and have always stayed with the regular trans and never had any problem....knock on wood....

[LimitedLM06]

What exactly is the safety benefit of a carbon fiber drive shaft? Is the strength? Of will it shatter if it comes out? I got one with my car but assumed it was more for rotating weight.

[LimitedLM06]

So what is the safety advantage of running a carbon fiber driveshaft? I got one when I bought my car, but thought it was for reciprocating weight.

[wisdirtfan]

If it breaks it will shatter instead of hitting your elbow and destroying the interior the x the loop etc. Basically tearing up everything in its path. We don't run a ballspline and broke a lift bar this year and it destroyed the deck the oil cooler the fifth coil and the shaft even managed to smash the oil tank on its way out so ya ballspline=carbon fiber shaft.

[AmickRacing]

Here's an interesting video. I knew about this a little bit, but watching the video helped it make a bit more sense...

https://www.facebook.com/photo.php?v=470937339716400

[keeks]

That video is serious voodoo that I never would have thought about. wow! Good info.

[7uptruckracer]

Carbon fiber is always a good idea. So what it breaks and you maybe lose a 10k race. This is a 10k hospital bill. Yoke broke, and the shaft became a can opener and propeller of destruction until I locked the rear brakes up. Tore everything out and apart from the battery in the back to the cables of the starter, to the wiring right out from the (not a nice word)(not a nice word)(not a nice word)(not a nice word)pit, It wraps anything up it snags and the only thing that saved my life was the battery cable tethered it so tight that the cable actually twisted and imprinted deep into the driveshaft tube