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Re: 4 link and pinion angle???
[Re: superstreet1896]
#1248573
06/10/12 07:12 PM
06/10/12 07:12 PM
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Joined: Mar 2003
Posts: 2,519
PA
moparacer
master
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master
Joined: Mar 2003
Posts: 2,519
PA
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Depends on what your angle is at the transmission. This is the way I do mine and its smooth at 145 mph. http://www.rosslertrans.com/Pinion%20angle.htmAnd 1 more thing if you cant move the instant center by adjusting the bars up or down the pinion angle isn't going to mean a whole lot of anything. 
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: 4 link and pinion angle???
[Re: superstreet1896]
#1248574
06/10/12 07:15 PM
06/10/12 07:15 PM
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Joined: Aug 2003
Posts: 43,252
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,252
Bend,OR USA
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Quote:
went to make a 4 link adjustment as i cant get my car down a marginal track, car works good everywhere else. car weighs 3090 with me in it. runs 11.50s 1/4 low 7.20s in 1/8. 9 in ford rearend. car 60's 1.50 1.54. found out i cant lower the bottom bar and cant lower the top bar on the rearend side due to the diagonal link bracket in the way. also cant lower the bottom bar up front because of where the welds are on brackets the rod end wont fit. biggest issue i saw was that the pinion angle was 5 degrees up. i could only get it down to about 2 degrees up. where do most people run their pinion angle at ???
I've never heard of anyone setting their pinion angle with negative (up) pinion angle, always at or more then 1 degree down I did drive a bracket BB Duster ladder bar car that had 2 to 3 degree negative pinion angle (up  ) When we first got the car, it came out of New York  I changed it to have between 2 and 3 degrees nose down pinionn angle at the track after making several passes, I had driven(raced it) the car at the track before discovering that. I didn't see any measurable differences in the cars time slip, I adjusted it at the track, that car didn't spin the tire before or after though  It ran 10.80 at Las Vegas,NV, 2500 Ft. above sea level it was BB Duster with ladder bars, AVO coil overs and a diagonal link, 3350 lbs with me in it Can you lengthen the bottom bars by adjusting hiems at the rear end or shorten the top bars by adjustng the heim joint lengths also?
Last edited by Cab_Burge; 06/10/12 07:23 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 4 link and pinion angle???
[Re: superstreet1896]
#1248575
06/10/12 07:17 PM
06/10/12 07:17 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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1 degree or less but not zero EDIT also if you need to, lengthen the bottom bars ... that will help get it down 
Last edited by MR_P_BODY; 06/10/12 07:20 PM.
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Re: 4 link and pinion angle???
[Re: superstreet1896]
#1248580
06/10/12 09:40 PM
06/10/12 09:40 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
it works good on good tracks, ill have to check the angle of trans. if you lengthen the bottom doesnt that change the wheelbase. i cant get the angle down because the bars are to long. think i need to cut them and tap them , anyone ever done that?? when i shorten the bars the jam nuts would then hit the brackets. also another issue i have is when i changed the angle the drive shaft then would hit the cross bar for the subframe. may have to notch it and reweld it. what do you all think. this car was recently backhalfed so its all new to me
If you keep shortening the top bars you are actually
moving the center line of the axle forwards...
if you lengthen the bottoms and shorten the tops
you are rolling the rear end around the axle center
line so you wouldnt necessarily be making it longer
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