Pinion Angles and Driveline Setup for the Street - Page 3 - Hot Rod Forum : Hotrodders Bulletin Board
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  #31 (permalink)  
Old 05-08-2007, 10:41 PM
 
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Though I do value forums greatly, I must agree—in some part— with the philosophy of fordSR. Forums are made up, mostly, of people who are concerned with results. As was mentioned, a person can make the same thing happen with Snap-On as he or she can with duct tape. When a group is created, such as an Internet forum for car enthusiasts, full of people who have a propensity to undo or re-create engineering and technology costing millions to carryout by OEMs, the results are usually less than stellar from a engineering and mechanics standpoint.

For instance, welding is one of the greatest perversions of technology. Any one can go to Home Depot or Lowes and buy a MIG welder. Most of these people will be able to lay a decent bead in a variety of materials, thicknesses, and positions. If this is all there is to it, short of economics, why are there full-fledged, sometimes graduate level professional engineers employed? Well, you can start out by guessing that there really is a lot more going on with a weld than how neat the bead looks, and even the penetration. Suffice it to say, even a great local welder skilled in the GTAW process on brass, aluminum, magnesium and cobalt lacks the ultimate knowledge to carry out what many will be taking for granted: the actual physics of the results.

So, this whole argument is more or less defunct. fordSR is arguing about not only the results, but the physics behind the results—research and engineering—where others are making a failed attempt to combat his point with solely results.

But, in the spirit of undoing millions of dollars worth of engineering, I still like to escape to the relaxed and simple environment of automotive enthusiast forums and my own cobbled little race car. That's right, before anyone accuses me of condescension and of being a jerk, I too practice the bad habits of fouled backyard engineering and welding. As a matter of fact, there is really nothing wrong with not being a welding engineer or astrophysicist so long as you understand that you don't mistake your practice for a mastery. Any time you start to think you have any aspect of any thing entirely figured out, or definite—in nature or measure, rest assuringly in the contrary. A perfect example of this is in what has been revealed in the design of the U-joint with regard to bearing speed and lubrication technique.

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  #32 (permalink)  
Old 05-11-2007, 08:07 PM
 
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I heard you parallel the pinion and trans. output shaft, but then push the rear down 2 degrees in a leaf spring application. This is because under any acceleration the springs wrap upwards. This would bring you back to parallel.
I'm setting my angles now, is this wrong?
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  #33 (permalink)  
Old 05-11-2007, 08:22 PM
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Unless you plan on doing alot of racing , I wouldn't go more than 1 degree between the two.
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Old 04-20-2014, 09:38 PM
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Sorry to drag this back up but I have a question, or better need advice on my pinion angle setting. My car has had a new motor/ trans swap and a new rear end with new perches ready to be welded on. The downward angle at the trans tail shaft is 5 degrees down. I understand that 3 is ideal BUT I cannot get the 2 degrees out of the trans without new motor mounts. On level ground what would be a good amount of degrees down on the pinion? Street car, lower power, I'm thinking 6 degrees up???????


Thanks in advance
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  #35 (permalink)  
Old 04-20-2014, 09:54 PM
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Not 6° up.

If trans is 5° down, equal to cancel would be rear 5° up,...... but to allow for power transfer spring wrap and flex, you'll want to set rear at 1-4° up,..... with 1-2° up being a higher hp motor with deeper rear gear, and 3-4° up being a lower hp set-up with stock or stockish rear gearing.
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  #36 (permalink)  
Old 04-20-2014, 09:56 PM
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Quote:
Originally Posted by Fairlane Man View Post
Sorry to drag this back up but I have a question, or better need advice on my pinion angle setting. My car has had a new motor/ trans swap and a new rear end with new perches ready to be welded on. The downward angle at the trans tail shaft is 5 degrees down. I understand that 3 is ideal BUT I cannot get the 2 degrees out of the trans without new motor mounts. On level ground what would be a good amount of degrees down on the pinion? Street car, lower power, I'm thinking 6 degrees up???????


Thanks in advance
If it has leaf springs.. And the trans tail shaft is down 5 degrees,, I would set the pinion at about 3.5 up..Under a load it will be around 5 degrees up..
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Old 04-20-2014, 10:58 PM
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It is a 63 Fairlane, leaf sprung with a c4 and a 300hp small block and 3:55 gears. Around 3 degrees sounds about right. Thanks!!
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Old 04-21-2014, 12:42 PM
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I would set it at 4 degrees up. It's going to go up the most at initial launch. For normal driving the driveline angles may be too much of a differance. But if it does vibrate it can be corrected with wedges. A lot of the newer Ford trucks had a problem with this and tried setting them up within a degree.
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  #39 (permalink)  
Old 04-21-2014, 02:51 PM
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trams to diff

the holey grail is the face of drive flang to the face of driven flang must be within 5degrees. big power should have traction bars to limit spring wind up. ther is a simple guge at a cheap price to get the angle corect,plus measure when vehicle is 4 wheels on the ground
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  #40 (permalink)  
Old 03-29-2015, 10:02 PM
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Quote:
Originally Posted by aralph View Post
I have a 1936 Ford with a SBC 350 ( about 300 horse ) with s 10 Tranny.

My Tranny tailshaft points down 5 Degrees and the rear does not have the spring perches welded in yet.
I can't reduce the angle on the tranny any more but the rear is optional.
What should my rear pinion be at.
The rear is aBronco with the pinion yoke offset by one inch to one side.
Am I in trouble with the tranny pointing down and pinion pointing up and the rear offset by 1 inch
Nope, you'll be just fine. Set the pinion about 3-4° UP. Virtually all rear drive vehicles have some amount of side to side pinion offset, no worries for you there either.
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