CV Design Questions

[fabr]

I'm sitting here and thinking about VooDoo's problem and CV issues in general. Well,across my pea brain comes the thought of why is a 930 is limited to 25-28 degrees max. Would a custom built cv with a thicker race say 2" thick  be able to allow more angle and plunge than the approx 1.5" thick race the 930 cv has? Would the longer grooves allow more angle or are there some other limiting factors? The fixed cv's allow 40 degrees or so . In my mind the only reason is that the much thicker race is the key and not the fact they are non-plunging design.

[Lance-W]

Makes sense to me.  The limiting factor is the "slice" of sphere the balls are rotating within so if you make the slice thicker you get more angularity.

[Boostinjdm]

not the fact they are non-plunging design.

I dissagree.  In order to plunge, the grooves have to be "straight" if ya know what I mean.  You can only get so much angle before the balls disengage the "straight" grooves.  With non-plunginge joints, the grooves are spherical so the balls never will disengage.  The limiting factor then becomes the axle hitting the race.

[Voodoochikin04]

what about a single ball-shaped design like a tilt steering unit.. could something like that handle good power?

[fabr]

I dissagree.  In order to plunge, the grooves have to be "straight" if ya know what I mean.  You can only get so much angle before the balls disengage the "straight" grooves.  With non-plunginge joints, the grooves are spherical so the balls never will disengage.  The limiting factor then becomes the axle hitting the race.

i HAD TO THINK A BIT ABOUT WHAT YOU SAID BUT YES i AGREE WITH WHAT YOU SAID.(Damn caps fooking lock. ) So the question really becomes this: How much angle could be gained with a wider race on a 930?  1*,3* 5* nothing? In other words what is the point of no return in the width of the 930 race. Is it already there or could there be some more angle to be gained?

[Doug Heim]

Can the non plunging CVs with 40* still plunge on the axle spline?

[fabr]

Anyone have the dimensions of these non plunging cv's?

[Nutz4sand]

Can the non plunging CVs with 40* still plunge on the axle spline?

Only a very tiny amount. When it gets that far around the shaft end is literally pointing at the ball tracks/grooves.

934's can go a tiny more than a 930. They are larger but are they much wider?

[fabr]

I don't know. Therefore I'm for answers. 

[Doug Heim]

I have a 934 CV joint and there HUGE!

Can take like 1000 HP too, Price is like $800 ea for the good ones the race team buys

[fabr]

I'm not interested in larger diameter.  Really all I'm curious about is if there is any possible increase in angle of the 930's with a wider race and if it's possible to do so without losing the balls. Actually I'm wondering if the cages would be the limiting factor first.

[fabr]

I know we've discussed it before but did we find out which non plunging cv has the same OD and bolt pattern as a 930"

[BDKW1]

Going wider will cut down on the amount of max angle they get. The axle will hit the outer housing sooner. If you have minimal plunge and clip the axle on both sides of the star so that it doesn't move that much, you can neck the axle down for a little more clearance. If you chamfer or thin down the outer housing for axle clearance you can get 32*. The problem is, the more angle you run the harder it is on the cages and the more heat you build. Going past 28* on a 930 will become a very expensive learning lesson.

[BDKW1]

I know we've discussed it before but did we find out which non plunging cv has the same OD and bolt pattern as a 930"

GKN sells fixed 930's. The outer housings are a little thinner but the rest is diminsionally the same.
 
Here is a link the the GKN catalog. http://www.rowland2.com/pdfs/cvdisc.pdf
 
"930's" are size 15 CV's and 934 are size 21. They have both plunging and fixed in this catalog.

[Carlriddle]

Agree with Doug, BIG!! Angle is only couple degrees more, the big use seems to be for monster power, 400, 500hp all the way up.

I think longer axles, having a very narrow rear end , and using wheels that are offset in keeping track width to a minimum would be the way to gain travel. 

I have an idea trying to draw up using 4 axles.  Will try to post it up this weekend.