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Author Topic:   pinion angle
jammin james
Dirt Full Roller

Total posts: 50
posted October 20, 2002 07:04 PM
ready to start getting ready for next year.76 firebird 3200lb pure stock what pinion angle degree am i looking for and what is that angle off of.visible my rearend looks to be pointing down slightly and looks to have driveshaft in weird angle. thanks!!!

outlawstock17
Dirt Forum Champ
Total posts: 620
posted October 20, 2002 08:21 PM
10-12 degrees for a leaf sprung 'bird. with the car on level ground use an angle finder on a flat portion of the third member or the housing. if your rearend yoke is pointed down a little, you're probably pretty close.

tilley88
Dirt Freak

Total posts: 353
posted October 20, 2002 11:38 PM
7 degrees down!

Scoot
Dirt Freak

Total posts: 330
posted October 22, 2002 12:46 PM
80 camaro, 3300lbs, would 7 down work for it too?

outlawstock17
Dirt Forum Champ
Total posts: 620
posted October 22, 2002 02:28 PM
6-8 degrees for a factory 4-link, 10-12 degrees for factory leaf springs. i've seen guys running more than that with a 3 link and a spring bar. too much and you could develop a wheel hop when you lift and go into the corner.

i use 8 in my '89 mustang with factory 4-link and i've used as much as 12 in my old '72 mustang with factory leafs.

[This message has been edited by outlawstock17 (edited October 22, 2002).]

tilley88
Dirt Freak

Total posts: 353
posted October 22, 2002 08:43 PM
I believe 7 degrees is a nice ballpark figure. I've seen guys snap suspension pieces tryin to run 9-11 degrees. Last leaf car I had hooked hard at 7 degrees. I suppose track surface and the driver's right foot play a big part in it, too.

Scoot
Dirt Freak

Total posts: 330
posted October 22, 2002 09:31 PM
This is all new to me as you can tell, how does it help? Why does it bite more with more down pinion angle?

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Scoot
Smith Racing Team
870-365-5989

hughes
Dirt Maniac

Total posts: 141
posted October 23, 2002 06:40 AM
Awww not that question, go back and read post from the start of this forum. I don't remember the exact topic or date. But it has been discussed in detail. You'll have some of these fist-fighting on the computer.

madmodshoe
Dirt Forum Racer

Total posts: 89
posted October 24, 2002 09:32 PM
Pinion angle does not increase/decrease traction.period. Your car will hook up the same with 7 degrees or 10 degrees of pinion angle. The only reason you need pinion angle is to make sure that you do not have a bind in the driveshaft u-joint. The leaf springs do not know nor do they care what angle the pinion is at when the resulting torque applied to them. There are many that will argue, but if draw it out on a piece of paper you will understand! Thanks, hope that helps.

outlawstock17
Dirt Forum Champ
Total posts: 620
posted October 24, 2002 10:24 PM
agreed, madmodshoe. i always ran more pinion angle on my leaf cars because the rearend rotated more than on a four link car due leaf deflection. the key is to put the rotational force on the rearend housing to work planting the tires. i used to use a partial leaf u-bolted to the front half of the leaf to help control the deflection. it really stuck the rear tires, much like a slapper bar in drag racing.

richmas
Dirt Roller

Total posts: 6
posted November 22, 2002 01:41 PM
For those having a hard time understanding why you need to run any angle at all need to realize that when you hit the gas the entire rearend housing rotates (pinion up). The goal is to have things fairly inline while under max torgue.

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