quote:

Originally posted by Greg Kelley:

quote:

Originally posted by seabass:
Looks a lot like my Goethe

How long have you had it JR? Anny issues with the boots?

Did you put the special pinion support on your spare center ?

Did you and your Dad both do it?

3 years , all I’d did was put it in, not sure what the special pinion support is, I just changed the pinion flange on both of my centers and bolted it in. I sent it in once and it was perfect.

J.R. did you gain MPH?

I don’t really know that Ed, rarely make it thru the traps w/o lol... I did it over the winter as well. I did notice it being smoother tho

So other than the car seems to accelerate smoother and it's possibly safer, do you feel it is worth the $ as a replacement to a good, traditional u joint driveshaft?

J.R, Isnt the Goethe a carbon fiber shaft? This one is 300M steel

quote:

Originally posted by Big Steve:
J.R, Isnt the Goethe a carbon fiber shaft? This one is 300M steel

No not carbon at all. Solid steel shaft....

quote:

Originally posted by seabass: I did notice it being smoother tho

That's because of the constant velocity joints.

When that driveshaft is spinning 7000+RPM the small velocity changes of the U-joint shaft are magnified. The velocity changes twice with every revolution, at 7000 RPM that's 233 times per second.

quote:

Originally posted by "The Bender":
Top, if the driveshaft angle is 0 then there is no accel-decel, any angle changes that. But if properly set up there shouldn't be much (if any) angle. When a suspended dragster leaves and the shocks change length it will always cause angle change, having such a short driveshaft in a dragster is where the problem lies.

When the angle of the output shaft is parallel to the yoke at the rear these is no variation in rotational speed between the two, so between the rear setup along with data on rear end movement you can really minimize this issue. And ya, short DS make it worse.

https://www.youtube.com/watch?v=Idk3BVDVHq4
The angles are excessive, but it gets the point across.

quote:

Originally posted by TOP38:

quote:

Originally posted by "The Bender":
Top, if the driveshaft angle is 0 then there is no accel-decel, any angle changes that. But if properly set up there shouldn't be much (if any) angle. When a suspended dragster leaves and the shocks change length it will always cause angle change, having such a short driveshaft in a dragster is where the problem lies.

When the angle of the output shaft is parallel to the yoke at the rear these is no variation in rotational speed between the two, so between the rear setup along with data on rear end movement you can really minimize this issue. And ya, short DS make it worse.

Agree 100%

quote:

Originally posted by DragRaceResults:
Goethe use to work at MW. I'm sure they did a deal.

winner winner

On a suspended car as the suspension moves the yoke one the transmission slides in and out some.

Does this Mark Williams unit able to handle some in and out travel like the yoke does?

Yes

quote:

Originally posted by 1320racer:
So other than the car seems to accelerate smoother and it's possibly safer, do you feel it is worth the $ as a replacement to a good, traditional u joint driveshaft?

without a doubt yes. I wouldn't hesitate to get another one I had a new car. Brett now has a all black one I just saw, looks great.

quote:

Originally posted by Bad News:
https://www.youtube.com/watch?v=Idk3BVDVHq4
The angles are excessive, but it gets the point across.

They talk in a little different terms than we normally use. But the video clearly shows that when the pinion angle is the same between the two....or 0 pinion, that the velocity of the output is constant regardless of operating angle.

A four link does well at maintaining pinion angle even when the shaft is short, and even though the operating angle changes. So if what we are looking for is constant output velocity, don't we already pretty much have that?

quote:

Originally posted by "The Bender":
Top, if the driveshaft angle is 0 then there is no accel-decel, any angle changes that. But if properly set up there shouldn't be much (if any) angle. When a suspended dragster leaves and the shocks change length it will always cause angle change, having such a short driveshaft in a dragster is where the problem lies.

I guess I was responding to you Bender. I always call it pinion angle, and operating angle. Operating angle I call the difference between the output and the shaft itself. This does change in a dragster. But the term is a little different than what they show in the video. The other term for me is pinion angle, and that is the difference between output and inputs....no reference to the shaft at all. The pinion angle should not change in a 4 link setup, and thus there should be no speed up/slow down. Am I thinking correctly? There may be other advantages to the CV setup. But I don't see the velocity as one that needs fixin.

I just got mine from Brett Goeth took just over two weeks just like he told me on the phone and also kept me up to date on the progress of my shaft. Bolted in with no problems. I’ll let you know if there is any difference next week but like Chris I did it for safety. Brett is a good guy it’s not his day job.....And he builds an awesome product

I had a very similar experience...good guy IMO

quote:

Originally posted by TORQIN:
I had a very similar experience...good guy IMO

Yeah but yer a trouble maker, at least that’s the way I remember it

Chit man, I never been booted off of a website...