|
|
08-16-2013, 03:23 PM | #1 |
Junior Member
Join Date: Jan 2010
Posts: 81
Likes: 0
Liked 12 Times in 6 Posts
|
GM A Body Drive Line Angles
What are optimum angles for this type of suspsension system. It seems I cannot get the angle of the pinion and the crank to be parallel. The engine/trans is pointing down by 5 degrees, when viewing car from the side it slopes toward the rear. The pinion is currently sloping down toward the ground as well. I have adjustable top trailing arms with heim joints each end and can adjust the angle of the pinion, which also affects driveshaft angle. I can also shim trans mount some as well until header clearance becomes an issue. Should I be more concerned with trying to minimize operating angles of the u joints at each end rather than relationship of the pinion angle to the crank angle.
Any input is much appreciated. Thanks, Scott |
08-17-2013, 10:58 AM | #2 |
Senior Member
Join Date: Sep 2007
Location: Henderson, NV
Posts: 578
Likes: 7
Liked 47 Times in 25 Posts
|
Re: GM A Body Drive Line Angles
The nose of the diff will rotate upward on takeoff, so it should point down a little at rest.
|
08-18-2013, 08:08 PM | #3 | |
Member
Join Date: Sep 2006
Location: Genoa, Illinois
Posts: 488
Likes: 9
Liked 6 Times in 4 Posts
|
Re: GM A Body Drive Line Angles
Quote:
This may explain the "pinion angle" concept better..... http://www.rosslertrans.com/pinion%20angle.htm Last edited by rallye bob; 08-18-2013 at 08:10 PM. |
|
08-19-2013, 08:17 AM | #4 |
VIP Member
Join Date: Nov 2007
Location: New Jersey
Posts: 1,973
Likes: 90
Liked 549 Times in 265 Posts
|
Re: GM A Body Drive Line Angles
Scott, I thought I answered all your questions/explained how to check/set in our PM's last week.
|
08-19-2013, 11:21 AM | #5 |
Junior Member
Join Date: Jan 2010
Posts: 81
Likes: 0
Liked 12 Times in 6 Posts
|
Re: GM A Body Drive Line Angles
Ed You did.
I just like to get other's opinions on the subject. Never hurts to have agreement. I have everything all set up and will try it in a week or two to see if the changes help. Any opinions on anti roll bar settings? No preload or pre load passenger side and if so do I make the links longer or shorter? Thanks, Scott |
08-19-2013, 12:36 PM | #6 |
Member
Join Date: Aug 2003
Location: Atlanta
Posts: 476
Likes: 18
Liked 71 Times in 22 Posts
|
Re: GM A Body Drive Line Angles
One thing to remember as you look at the Rossler chart is that having zero zero is better than +two-two. Don't have the formula in front of me but I think a 3 degree ujoint misalignment eats 1% horsepower so if you are down 3 on the trans and up 3 on the rear to make them parallel then it is 1 or 2% loss. Don't remember if the formula is for 1 joint or a pair. Work to get 0-0 knowing sometimes you just cant.
__________________
Stewart Way 2424 SS |
08-19-2013, 04:57 PM | #7 |
VIP Member
Join Date: Nov 2007
Location: New Jersey
Posts: 1,973
Likes: 90
Liked 549 Times in 265 Posts
|
Re: GM A Body Drive Line Angles
|
08-20-2013, 08:11 AM | #8 |
VIP Member
Join Date: Jul 2002
Location: Michigan
Posts: 1,222
Likes: 134
Liked 498 Times in 104 Posts
|
Re: GM A Body Drive Line Angles
[QUOTE=1320racer;395446]ok, just make sure that these others offering opinion have GM A body cars that leave on par with this one, launching off the footbrake and nearly 3900 lbs.
The all knowing, 1320 Racer, speaks again. Get over yourself. That car is not a Stocker, not a Super Stocker. Anyone (with enough money) can stuff a high HP BB Chevy in a Chevelle, Firebird, etc., and go fast.
__________________
Jim Kaekel 3836 STK |
08-20-2013, 09:04 AM | #9 | |
Senior Member
Join Date: Jun 2005
Location: Nashville N.C.
Posts: 505
Likes: 4
Liked 100 Times in 26 Posts
|
Re: GM A Body Drive Line Angles
[quote=Jim Kaekel;395533]
Quote:
__________________
NHRA AND IHRA STOCK ELIMINATOR 2772 |
|
08-20-2013, 10:36 AM | #10 |
VIP Member
Join Date: Nov 2007
Location: New Jersey
Posts: 1,973
Likes: 90
Liked 549 Times in 265 Posts
|
Re: GM A Body Drive Line Angles
it ain't about "go fast", it's about getting these cars to work and neither would you know anything about!
Meanwhile, show us your car no mind another GM A body that has gone 1.28 60 foot with a bolt on suspenion, using all and nothing but the factory mounting points, nothing welded and no anti roll bar, launching off the footbrake and weighing 3900 lbs. The Proof is in the Performance! Last edited by 1320racer; 08-20-2013 at 10:48 AM. |
|
|