Elon;
There is a difference between a "U-joint" (Cardan type) and a "CV-
joint" (Rzeppa type); a Rzeppa joint has true constant velocity-- a big
advantage where the angle changes such as in a FWD setup.
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of 3 liter
Sent: Friday, October 13, 2006 2:05 PM
To: 'land-speed submit'
Subject: CV U-Joint
See what you started, Skip :-)
I was on the 3 story tower briefly when Ray Crowell was video taping a
few
runs (many thanks Ray). I saw a few spins in real life. Man! .does it
happen fast. Unless I could hear the engine nosing over or sumptin like
that
there was no way to forecast what was about to happen from my view.
Maybe
the driver felt a little wiggle but you couldn't see it coming from the
tower. Obviously, because of the precarious traction, it is best to
apply
torque in the smoothest manner possible.
Unless driveline inclination is zero, a normal u-joint does NOT rotate
evenly throughout its 360 degree rotation. It speed up and slows down
every
360 degree rotation. The effect becomes worse as the angle increases.
Even
if you can get both u-joints in phase it can't possibly be as smooth a
constant velocity u-joint. With the driveshaft RPM so high for such a
long
time; I was wondering how many of you run a constant velocity u-joint?
How
many don't? What are your thoughts, ideas, and observations? -Elon
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