pinion angle
#2994336
12/11/21 01:52 PM
12/11/21 01:52 PM
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Joined: Jan 2003
Posts: 1,612 westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,612
westerly, ri. usa
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can you set angle with jack stands under rear axle and front lower control arms? doing old school s/s springs 5/7 nose down
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Re: pinion angle
[Re: 440lebaron]
#2994350
12/11/21 02:50 PM
12/11/21 02:50 PM
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Joined: Mar 2011
Posts: 3,099 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,099
Michigan
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can you set angle with jack stands under rear axle and front lower control arms? doing old school s/s springs 5/7 nose down Yes.
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Re: pinion angle
[Re: 440lebaron]
#2994351
12/11/21 02:50 PM
12/11/21 02:50 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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While it may work, my experience says It’s more likely that the car won’t sit the same on stands as it does on the tires. The dynamics of leverage at the front suspension may be working against you.
Set it on the ground, preferably at race weight with a but in the seat. Measure the current angle of the yoke on the rear end, and the output shaft of the transmission with a simple magnetic angle finder. Do the math to figure the angle like that. Then make the required adjustments at the perches and re-measure.
If you don’t have wheels & tires yet, I’d try to borrow some for a day, or just wait until you can do it correctly.
Only my 2c. Good luck.
Last edited by StealthWedge67; 12/11/21 03:07 PM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: pinion angle
[Re: A727Tflite]
#2994428
12/11/21 06:59 PM
12/11/21 06:59 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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I’m admittedly and probably splitting hairs, but that’s not totally true. The load on or off the front suspension will be directly and inversely related to the load on the rear suspension. If the rear suspension is not loaded as it would be with the car static on the ground, the pinion will not be at the same angle as it will be with the suspension in the static loaded position. This difference may be very slight, but if you’re going to set pinion angle, especially in a race car, you might as well be as accurate as possible.
Last edited by StealthWedge67; 12/11/21 08:29 PM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: pinion angle
[Re: n20mstr]
#2994436
12/11/21 07:27 PM
12/11/21 07:27 PM
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Joined: Jan 2003
Posts: 10,018 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,018
Frostbitefalls MN (Rocky&Bullw...
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Jack stands under the rear is OK PROVIDED you support the front at the front spindle center, to get proper rear axle loading . Both for/ aft position and angle of the chassis will affect rear axle load.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: pinion angle
[Re: Cab_Burge]
#2994515
12/12/21 04:44 AM
12/12/21 04:44 AM
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Joined: Nov 2004
Posts: 16,542 On the run…
BloFish
I Live Here
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I Live Here
Joined: Nov 2004
Posts: 16,542
On the run…
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So what would be the proper degree?
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: pinion angle
[Re: CMcAllister]
#2994681
12/12/21 05:45 PM
12/12/21 05:45 PM
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Joined: Mar 2011
Posts: 3,099 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,099
Michigan
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Like I said before - keep the car horizontal. Jack stands under the control arms or like shown - front tires on a buck.
Depending on the size of your [censored], add your weight to the driver seat doing any front end alignment, pinion angle setup, rear suspension preloads, weight bias setup.
There are plenty of YouTube videos of rear suspension dynamics from launch to the traps showing rear axle windup - I think DiZuster did a few.
Last edited by Transman; 12/12/21 05:50 PM.
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Re: pinion angle
[Re: A727Tflite]
#2994788
12/12/21 10:42 PM
12/12/21 10:42 PM
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Joined: Dec 2005
Posts: 11,704 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,704
Fulton County, PA
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CMcAllister - nice set of bucks. Some 2x4s and deck screws. Have several sets. Any cage work, suspension set up, interior, electrical, plumbing, etc. goes on them. Car is supported correctly and I'm not crawling around on the floor or trying to get under it to turn screws. Scale pads fit. I can get it real close and level on them. No lift supports in the way or running it up and down.
Last edited by CMcAllister; 12/12/21 10:42 PM.
If the results don't match the theory, change the theory.
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Re: pinion angle
[Re: DoubleD]
#2995350
12/14/21 07:48 PM
12/14/21 07:48 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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Question If u set pinion angle with a set of 28 inch tall tires and then switch to 30 inch tall tires, what does this taller tire do to pinion angle
Old Geezer Racing
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Re: pinion angle
[Re: SCATPACK 1]
#2995354
12/14/21 08:02 PM
12/14/21 08:02 PM
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Joined: Nov 2009
Posts: 3,082 St. Paul , Mn.
tubtar
master
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master
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
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Question If u set pinion angle with a set of 28 inch tall tires and then switch to 30 inch tall tires, what does this taller tire do to pinion angle Makes them higher off the ground ?
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