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Author Topic:   pinion angle
tforsythe
Dirt Roller

Total posts: 12
posted December 13, 2005 03:23 PM  
can anyone tell me what the stock pinion angle is on a metric chassis with the stock 7.5 rear

Steve Dupree
Dirt Freak

Total posts: 403
posted December 13, 2005 05:14 PM  
I have heard so much on this subject and very intrested in touching base here. We have top modified runners here that are real bad and most run as sraight as you can get the driveline with the car setting still. I relize maybe there are traction advantages if you had more but then you are reducing power because of binding up the drivetrain.

Lets here some things about this i really want too here some opinions.

I personally think you need a free drive system without bind but maybe i am wrong.

So many talk pinion angle but they take it as to the ground not the angle of the motor. What you want i think is where the driveline is straight when under full power. That way it turns easier and doesnt ruin parts. So if you have a dyno you can use and look at what your suspesion does it might be helpfull.

Lets talk about this a little

bobaluuu
Dirt Freak

Total posts: 491
posted December 13, 2005 05:44 PM  
come on dupree, you know this has been beat to death ten times over, ck the archives and leave the discussion there, Please

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Light it up, Baby!

tforsythe
Dirt Roller

Total posts: 12
posted December 13, 2005 06:17 PM  
my new rules says my pinion angle must be at 0 and iam wondering if a stock gm metric rear is like that from stock and my next ? is will rear ride height affect the angle

john56h
Dirt Forum Racer

Total posts: 80
posted December 13, 2005 08:03 PM  
How do they come up with such dumb, un-educated rules? Who knows what it is stock. There are too many factors that affect it. My guess is that every car at the track will have to make modifications to meet that rule! Is the rule meant to keep the cars stock? If so it seems a bit counter productive. As a guess, I'd say that stock is going to be somewhere between 1 degree up and 1 degree down. As soon as you start messing with ride heights it will change though. Ideally you would want the pinion to point downward towards the front at static ride height, no more than 5 degrees.

sideways
Dirt Forum Champ
Total posts: 748
posted December 14, 2005 05:30 AM  
After rolling my car and getting hit like a pin ball mine ended up 10degrees toward the floor pan.lol

racin78p
Dirt Freak

Total posts: 341
posted December 14, 2005 01:36 PM  
Not again. Please, not again.

Hey sideways: pretty cool though,...

Race on.

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racin78p
if it ain't fun, then don't run

uforacing51
Dirt Forum Champ
Total posts: 572
posted December 16, 2005 03:50 PM  
How do you adjust the pinion angle on a car with a Stock rear suspension in it? note the section you are in here guys

mike9
Dirt Forum Racer

Total posts: 88
posted December 16, 2005 04:06 PM  
metric pinion angle is right at 1.5 degrees up

mike9
Dirt Forum Racer

Total posts: 88
posted December 16, 2005 04:07 PM  
oops forgot to mention it changes slightly with ride hieght too i checked with a digital angle finder

john56h
Dirt Forum Racer

Total posts: 80
posted December 16, 2005 07:35 PM  
Interesting....I have a 1964 Oldsmobile F-85 street car. It has stock adjustable upper control arms on the rear suspension. Both upper arms have ecentric washers on the bolts that set into slots in the control arm. They will change the length of the arm when turned by a wrench. The stock length of these arms are too long to fit the metric chassis though.

mike9
Dirt Forum Racer

Total posts: 88
posted December 17, 2005 08:15 AM  
the 65-68 ford galaxies had an upper link like that to but they were a three link with a panhard bar funny how some of the best race technology was already used 40 years ago on the street huh

Steve Dupree
Dirt Freak

Total posts: 403
posted December 17, 2005 08:45 AM  
Yea it is. Our 64 Elcamino has the samething but in a 12 bolt. I always wondered why more people dont use these rearends.

john56h
Dirt Forum Racer

Total posts: 80
posted December 17, 2005 08:32 PM  
I have seen Metric chassis with the crossmember from a 64-72 Chevelle replacing the original, so that the older rearend and longer upper trailing arms could be used.

tforsythe
Dirt Roller

Total posts: 12
posted December 19, 2005 05:37 PM  
thanks mike9 thats the info iam looking for i wanted as much info as i could get before i called the tech guy

audetteracing95
Dirt Newbie

Total posts: 2
posted December 24, 2005 08:24 PM  
I set mine up to 7 degrees angle down

racer17j
Dirt Forum Champ
Total posts: 5515
posted December 24, 2005 11:08 PM  
if you have a rules meeting before the season starts you may want them to re word that rule i'm guessing they realy mean to say no changing of pinion angle or no shortening or lenghtening of trailing arms

  

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