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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering> pinion angle setup
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Topic Review (Newest First)
11-04-2011 02:35 PM
Centerline
Quote:
Originally Posted by 35terraplane
Well if nothing else, if no one knows how to setup the pinion angle, we all know it doesn't take much to get a degree in Motorsport Engineering or technical engineering in th UK......
Boy, if that ain't the truth!

Centerline
HotRodsAndHemis.com

"The difference between genius and stupidity is that genius has its limits." - Albert Einstein
11-04-2011 10:17 AM
cliff tate
pinion angle

the face of trans out and diff in useing a angle gauge should be no more than 5dgrs different.,trans and engine can be to the left or right of the diff aslong as faces within 5dgrs.this info came from a dana service manual.
if engine and trans moved it must remain paralelto diff.It can be lower higher just get angles within the 5
11-04-2011 12:25 AM
35terraplane
Pinion Angle

Quote:
Originally Posted by 5 CWT
Too anal for me now guys! I have a honours degree in motorsport engineering and a distinction in technical engineering. I have proved my point. End of my posts in this subject.....
Well if nothing else, if no one knows how to setup the pinion angle, we all know it doesn't take much to get a degree in Motorsport Engineering or technical engineering in th UK.

I'm sorry my bad, lock her up.

Bob

After 3 pages and the op doesn't get it something has to be said to lock it up.
11-03-2011 08:42 PM
MARTINSR I think the thread is valuable, it is explained many times so almost anyone can understand. I think it's of value to anybody searching the forum for pinion angle information.

Brian
11-03-2011 08:06 PM
NEW INTERIORS I really don't understand why it's so hard to understand how to set the pinion angle..

This is what this thread is starting to look like and case y'all don't know it by now..



I really think he dead by now !!!!!!
11-03-2011 07:56 PM
Centerline
Quote:
Originally Posted by user151
Yes, I think this thread (myself included) got somewhat astray from the original question, as you pointed out.
Not really that far astray. "U" joint angle and pinion angle are related and how you set the pinion angle has a direct effect on "U" joint operating angles. IMHO, you can't really talk about one without the other.

Centerline
HotRodsAndHemis.com

"When buying a used car, punch the buttons on the radio. If all the stations are rock and roll, there's a good chance the transmission is shot." - Larry Lujack
11-03-2011 06:58 PM
user151
Quote:
Originally Posted by RatPin
Got it. So you weren't actually even talking about pinion. You were talking U-joint angle. The OP was asking about pinion angle, but I see what you mean.
Yes, I think this thread (myself included) got somewhat astray from the original question, as you pointed out.
11-03-2011 06:28 PM
RatPin
Quote:
Originally Posted by user151
My point was that the trans and pinion angles will not change, but their angles with the driveshaft will become larger as the car is raised - which is not good for the universal joints.
Got it. So you weren't actually even talking about pinion. You were talking U-joint angle. The OP was asking about pinion angle, but I see what you mean.
11-03-2011 05:49 PM
5 CWT Too anal for me now guys! I have a honours degree in motorsport engineering and a distinction in technical engineering. I have proved my point. End of my posts in this subject.....
11-03-2011 03:36 PM
MARTINSR
Quote:
Originally Posted by Tony@AirRideTech
Until I read Centerline's last post I was going to be surprised we even made it this far without refering to harmonic cancelation and phasing ha ha ha ha ha ....

In the 60's 70's those cars that were jacked up in the *** end.. nobody is saying they were right. Also as your (typically) then built car having a set of ladder bars under them would have somewhat kept the driveline angle relatively right depending on the variable. Notice I said relatively... Those cars were also typically sporting 60 series tires that rode oh so nice where you couldnt pick up a driveline vibration...

4x4 guys... it is a complete compromise and anyone with a lifted truck invariably accepts accelerated U joint wear... as far as vibration... Tires usually larger then 35 will omit any notable driveline vibration.
60 series, N50s baby, N50s. I have a Ford truck at the shop right now with some HUGE tread mud tires my God they shake the fillings out of your teeth going down the street. I don't think he is noticing any vibration from the drive shaft.

Brian
11-03-2011 01:27 PM
Tony@AirRideTech Until I read Centerline's last post I was going to be surprised we even made it this far without refering to harmonic cancelation and phasing ha ha ha ha ha ....

In the 60's 70's those cars that were jacked up in the *** end.. nobody is saying they were right. Also as your (typically) then built car having a set of ladder bars under them would have somewhat kept the driveline angle relatively right depending on the variable. Notice I said relatively... Those cars were also typically sporting 60 series tires that rode oh so nice where you couldnt pick up a driveline vibration...

4x4 guys... it is a complete compromise and anyone with a lifted truck invariably accepts accelerated U joint wear... as far as vibration... Tires usually larger then 35 will omit any notable driveline vibration.
11-03-2011 01:00 PM
Centerline
Quote:
Originally Posted by 5 CWT
I take what you say but why does a car with a jacked up rear,in some cases 12" not affect the driveability or cause viration?
By increasing the ride height the "U" joint angles are increased. If the trans output shaft and the pinion angle remain in the same plane (basically parallel) the natural harmonics of the ellipses are still canceled out. The difference is in the stress put on the "U" joint when operating at a more drastic angle. "U" joints can operate at pretty drastic angles and you can even increase the angle by doing some judicious grinding but.... the greater the operating angle, the shorter the life of the "U" joint. Most jacked up 4x4 guys are very aware of this. The important thing in any setup is to adjust the angles to cancel the ellipse harmonics as best as possible. Different suspensions will require different pinion angles based on how the suspension moves. Also drag racing setups will be different than street setups. Its not rocket science but a clear understanding of what happens between the trans output shaft and the pinion gear when initially setting up a driveline will save a lot of time and experimentation.

Centerline
HotRodsAndHemis.com

"Instructions are just the manufacturers opinion of how it should be put together". - Tim Allen
11-03-2011 12:36 PM
MARTINSR
Quote:
Originally Posted by user151
My point was that the trans and pinion angles will not change, but their angles with the driveshaft will become larger as the car is raised - which is not good for the universal joints.
Will the U joints be USED when the car is Raised? If you are raising it permanetly then you set the pinion angle accordingly. If you are raising the car with a jack to change the tire, I recommend letting the jack down before driving it and using the U joints.

Brian
11-03-2011 10:18 AM
user151 If you ask ten typical HOT rodders, I bet 8 would get it right.....
11-03-2011 07:03 AM
fordSR If you asked 10 tyipcal street rodders how to set up a pinion angle, only two would get it right. The reason.........because so much mis-information is put out as fact on forums such as this. Instead, try going to a reliable source for info such as just about any GM rear drive, shop manual, a custom drive line shop, or others in the business of drivelines. Inland Empire Driveline has been supplying custom length drive lines for many years, here's what they say about pinion angle:

http://www.iedls.com/Education-Zone.asp?CID=3

Do a Google search for drivelines and get your info from those in the business and not from a thread such as this one which is full of misinformation.

Jim
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