Posted By: bigdad
Pinion angle
Posted By: tubtar
Re: Pinion angle - 07/26/14 04:42 PM
That's it. I'm gettin me one of those ! 
Posted By: DoctorDiff
Re: Pinion angle - 07/26/14 05:05 PM
Note how smooth the U-joints rotate when the pinion becomes PARALLEL to the transmission (motor side in this example).
Posted By: Crizila
Re: Pinion angle - 07/26/14 06:41 PM
I'm at a loss for snide remarks.
Posted By: Thumperdart
Re: Pinion angle - 07/26/14 07:28 PM
Quote:He`s trying very hard to be convincing surrounded by all of his plaques/awards...........too funny.
I'm at a loss for snide remarks.
Posted By: Sport440
Re: Pinion angle - 07/27/14 04:17 AM
Quote:
Note how smooth the U-joints rotate when the pinion becomes PARALLEL to the transmission (motor side in this example).
There are even Better vids out there then this one.
It doesnt take a Vid for me to understand that a PARALLEL driveline angle is what to shoot for even if its on a different plane.
You can tell the doubters, about the vids, but they dont want to see them. Why, because, they dont want to kmow that they were wrong or really didnt truly understand, this pinion angle thing.
Another human Ego fault I guess. 
Fact, Ujoints work best in a parallel plane, even if that plane isnt on the same exact plane, as long as both are parallel. Period!!
Posted By: Thumperdart
Re: Pinion angle - 07/27/14 04:47 AM
Quote:Quote:
Note how smooth the U-joints rotate when the pinion becomes PARALLEL to the transmission (motor side in this example).
There are even Better vids out there then this one.
It doesnt take a Vid for me to understand that a PARALLEL driveline angle is what to shoot for even if its on a different plane.
You can tell the doubters, about the vids, but they dont want to see them. Why, because, they dont want to kmow that they were wrong or really didnt truly understand, this pinion angle thing.
Fact, Ujoints work best in a parallel plane, even if that plane isnt on the same exact plane, as long as both are parallel. Period!!
Unfortunately leaf-spring street cars have to find a happy medium...........
Posted By: Sport440
Re: Pinion angle - 07/27/14 05:15 AM
Quote:Quote:Quote:
Fact, Ujoints work best in a parallel plane, even if that plane isnt on the same exact plane, as long as both are parallel. Period!!
Unfortunately leaf-spring street cars have to find a happy medium...........
Absolutely, we shoot for the "happy medium" as our leaf spring cars are and have dynamic movement. Im glad you used the word happy
The "Central" controversy of the pinion angle debate is how you adjust that "happy medium"
1, "drive shaft/ pinion centerline"
2, "tranny centerline/pinion centerline"
One of those is the Best and most accurate way to set for the best "happy medium"
The other is a attempt to set a "happy medium"
between the drive shaft/pinion centerline" with no reguards to the actual true driveline angles. Setting things blindly so to speak.
You want to know where Both angles are at, Not just one.
Edit, There are Two Ujoints, not just one. We need to keep them "Both Happy" Neither are happy if you set up for one. Both need to be considered.
Posted By: Thumperdart
Re: Pinion angle - 07/27/14 05:23 AM
Quote:Quote:Quote:Quote:
Fact, Ujoints work best in a parallel plane, even if that plane isnt on the same exact plane, as long as both are parallel. Period!!
Unfortunately leaf-spring street cars have to find a happy medium...........
Absolutely, we shoot for the "happy medium" as our leaf spring cars are and have dynamic movement. Im glad you used the word happy
The "Central" controversy of the pinion angle debate is how you adjust that "happy medium"
1, "drive shaft/ pinion centerline"
2, "tranny centerline/pinion centerline"
One of those is the Best and most accurate way to set for the best "happy medium"
The other is a attempt to set a "happy medium"
between the drive shaft/pinion centerline" with no reguards to the actual true driveline angles. Setting things blindly so to speak.
You want to know where Both angles are at, Not just one.
Edit, There are Two Ujoints, not just one. We need to keep them "Both Happy" Neither are happy if you set up for one. Both need to be considered.
I measure three areas; ft. u-joint to trans(no less than 1 degree), rear end and rear u-joint and the most critical to me, trans to rear end............fun stuff..........
Posted By: B G Racing
Re: Pinion angle - 07/27/14 01:35 PM
Very informative in a perfect world I would like to see a similar demostration with shock travel up and down,pinion movement under accelaration and decellaration as well as drive train alignment or mis alignment side to side as well as other issues that are found in a race car chassis.In mechanical engineering class some 47 years ago we had a professor build some thing similar with the final joint attached to a fixture that was spring loaded so that it could be tilted similar to pinion rotation and move up and down like shock travel and a adjustable base to simulate different aligmnents.He also had sensors and indicaters to graph the effects of these angles for vibrations(harmonics) and paracitic drag or power lose.All the movements could be controlled by a series of levers while the assembly was under power.If memory serves me correctly his class on drive train dyanamics was funded by GM.Ford and Chrysler.
I would like to see a similar demostration with shock travel up and down,pinion movement under accelaration and decellaration as well as drive train alignment or mis alignment side to side as well as other issues that are found in a race car chassis.In mechanical engineering class some 47 years ago we had a professor build some thing similar with the final joint attached to a fixture that was spring loaded so that it could be tilted similar to pinion rotation and move up and down like shock travel and a adjustable base to simulate different aligmnents.He also had sensors and indicaters to graph the effects of these angles for vibrations(harmonics) and paracitic drag or power lose.All the movements could be controlled by a series of levers while the assembly was under power.If memory serves me correctly his class on drive train dyanamics was funded by GM.Ford and Chrysler.
Posted By: DoctorDiff
Re: Pinion angle - 07/27/14 04:54 PM
If the transmission and pinion are mis-aligned side to side, U-joints still operate as smoothly as possible when the pinion becomes parallel to the transmission.
I ran an offset (motor-home) rear in my Dodge truck for years this way.
The rule of thumb is no more than 4 degrees up during acceleration, or 4 degrees down during braking (pinion relative to the transmission center-line).
I ran an offset (motor-home) rear in my Dodge truck for years this way.
The rule of thumb is no more than 4 degrees up during acceleration, or 4 degrees down during braking (pinion relative to the transmission center-line).