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Hot Rods body roll

Discussion in 'The Hokey Ass Message Board' started by cycledelicjohn, May 30, 2021.

  1. cycledelicjohn
    Joined: Mar 9, 2008
    Posts: 745

    cycledelicjohn
    Member

    ANYONE KNOW THE BEST (EASIEST ) WAY TO STOP BODY ROLL AT HIGHER SPEED @ 65 MPH & UP ON A 2300 LB COUPE ????
     
  2. Already have a sway bar?
     
  3. King ford
    Joined: Mar 18, 2013
    Posts: 1,469

    King ford
    Member
    from 08302

    If your talking about the car rolling over towards the outside when cornering but everything else about the ride , steering etc is good you need to either add or increase the diameter of the antiroll bar/bars....some people call them sway bars....if you have none, do the front first...you need to be careful that you don't get more roll resistance in the rear than the front or the car will spin out too easily....high tech guys call it " oversteer ".....
     
  4. redo32
    Joined: Jul 16, 2008
    Posts: 1,870

    redo32
    Member

    Post some pictures and tell us about your suspension. Lower the center gravity, drop that puppy on the ground. Proper shackles and or panhard bar and good shocks mounted at proper angle. Then a sway bar.
     
    spanners likes this.

  5. kevinrevin
    Joined: Jul 1, 2018
    Posts: 117

    kevinrevin
    Member
    from East Texas

    SPEAK UP, WE CAN'T HEAR YOU!
    The best way will not likely be the easiest way. Stiffer springs, better shocks, stiffer anti-roll bars and lowering the roll axis are all ways to lessen body roll.

    Until you describe your chassis details more, you will get speculation rather than useful information.
     
  6. Mike VV
    Joined: Sep 28, 2010
    Posts: 2,440

    Mike VV
    Member
    from SoCal

    cycle -

    Why the ALL...capital letters..?

    You've heard of "anti-sway bars"...correct?
    This IS...their main function in life.


    Hey Lloyds -
    Yeah, that would be..."anti"-sway bar to be most correct.
    The little details matter.

    Mike
     
  7. Hey I'm a painter, what do you expect lol
     
  8. twenty8
    Joined: Apr 8, 2021
    Posts: 443

    twenty8
    Member

    Roll centers, and therefore the roll axis, is almost always lower than the center of gravity. Lowering the roll axis further would lengthen the roll moment, and actually increase body roll.
     
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  9. samurai mike
    Joined: Feb 24, 2009
    Posts: 506

    samurai mike
    Member

    body roll is traditional. if the rockers don't scrape in a corner, you ain't livin!
     
  10. kevinrevin
    Joined: Jul 1, 2018
    Posts: 117

    kevinrevin
    Member
    from East Texas

    That's correct. Higher roll axis would give less body roll. My fingers didn't hear what my brain was saying to them.
     
    twenty8 likes this.
  11. twenty8
    Joined: Apr 8, 2021
    Posts: 443

    twenty8
    Member

    Or, as @redo32 said, lower the center of gravity. Shorter moment equals less leverage, and less transfer of force.
    There are probably simpler ways to for the OP to lessen body roll to some extent with the setup he has, but until he elaborates on his current suspension configuration (with pics), we can't offer much assistance...........:)
     
    kevinrevin likes this.
  12. gene-koning
    Joined: Oct 28, 2016
    Posts: 2,548

    gene-koning
    Member

    Still have buggy springs? Getting rid of them will sure help cure body roll.
     
  13. twenty8
    Joined: Apr 8, 2021
    Posts: 443

    twenty8
    Member

    Transverse or parallel ??????????
     
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  14. gene-koning
    Joined: Oct 28, 2016
    Posts: 2,548

    gene-koning
    Member

    Transverse would present more body roll then parallel would, but really, with a true high arched buggy spring, either would qualify.
     
  15. twenty8
    Joined: Apr 8, 2021
    Posts: 443

    twenty8
    Member

    @gene-koning
    Ok, so by buggy spring you are meaning 'high arch', and not necessarily all leaf springs?
    Genuinely interested in your views. I have read a lot of your stuff and respect your knowledge.
     
    Last edited: May 31, 2021
  16. Mimilan
    Joined: Jun 13, 2019
    Posts: 940

    Mimilan
    Member

    You need to increase the roll stiffness.
    At low average speeds you need softer suspension, so Front and Rear anti roll bars are best.

    At higher average speeds you need stiffer suspension, so you need less stiffness in the anti roll bars.


    1G at 30 mph will be around a tight hairpin, and 1G at 100 mph will be around a sweeping corner
    Both will have the same bodyroll, but the higher speed situation will need stiffer suspension [wheel rate]
    So lateral acceleration [G's] has the same weight transfer at the same G force regardless of the speed.

    Lowering the CGH and widening the Track will also reduce the weight transfer

    Not in a Corvette
     
  17. Wanderlust
    Joined: Oct 27, 2019
    Posts: 356

    Wanderlust

    How you approach cornering can help, deceleration before and accelerate through the corners can really make a difference.
     
  18. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,207

    Truckedup
    Member

    Sway bars do more than limit body roll..They affect the understeer or oversteer and can really change the feel of the vehicle...
     
  19. Blues4U
    Joined: Oct 1, 2015
    Posts: 5,934

    Blues4U
    Member
    from So Cal

    Yeah, I don't think transverse mounted springs result in increased body roll. The stiffness of the spring will have an effect, but not transverse vs parallel.
     
  20. Blues4U
    Joined: Oct 1, 2015
    Posts: 5,934

    Blues4U
    Member
    from So Cal

    2300# coupe is pretty light, I'd guess the OP is working with an early 30's car, like a Model A. I'll tell you the easiest way to get flat cornering in a Model A, go with split bones or hair pins mounted to the outside of the frame rails, you don't get any body roll at all. Of course, you don't get a very supple suspension either. But if no body roll is your goal, that will do it.
     
  21. Relic Stew
    Joined: Apr 17, 2005
    Posts: 1,147

    Relic Stew
    Member
    from Wisconsin

    Splitting the bones makes the axle function as an anti-roll bar. A rather stiff one. A narrow split will be less stiff than going out to the frame.
     
  22. gimpyshotrods
    Joined: May 20, 2009
    Posts: 18,672

    gimpyshotrods
    ALLIANCE MEMBER

    Need pictures of the current suspension.
     
    VANDENPLAS likes this.
  23. Ned Ludd
    Joined: May 15, 2009
    Posts: 4,274

    Ned Ludd
    Member

    Transverse leaf springs are no less roll-stiff than any other kind of spring — because they don't pivot in the middle but are bolted solidly to the frame — and due to greater possible spring base might actually be stiffer in roll than parallel leaf springs.

    To reduce roll — assuming you don't really have the opportunity to widen the track or lower the centre of mass significantly: increase spring rates, at the expense of ride comfort and adhesion on bumpy surfaces; or raise the roll axis, at the risk of jacking; or add anti-roll bars, at the expense of the ability to tune the chassis via differential roll stiffnesses due to frame flex. Best in the real world might be a combination of all three in moderation. Best in theory would be to interlink the roll-resistance functions, which is out-there stuff (though not hard to get your head around once you get into it.)
     
    twenty8 likes this.
  24. ronzmtrwrx
    Joined: Sep 9, 2008
    Posts: 700

    ronzmtrwrx
    Member

    Is it just me, or does anyone else find it sort of amusing that the OP starts out this thread with a relatively vague post, in all caps to boot, and then seems to disappear? No follow up with current suspension details or anything. Just leaves it for everyone else to discuss amongst themselves. :confused:
     
    stillrunners, Blues4U and 210superair like this.
  25. 210superair
    Joined: Jun 23, 2020
    Posts: 956

    210superair
    Member
    from Michigan

    Seems to happen a lot lately. Op drops a question and disappears, everyone else argues over the question for a few days.... Lol.
     
    Wanderlust, Blues4U and ronzmtrwrx like this.
  26. DDDenny
    Joined: Feb 6, 2015
    Posts: 15,342

    DDDenny
    Member
    from oregon

    Maybe he got in the middle of the demise of TAPATALK on the HAMB.
     
    210superair and ronzmtrwrx like this.
  27. ronzmtrwrx
    Joined: Sep 9, 2008
    Posts: 700

    ronzmtrwrx
    Member

    Hahaha. You may be onto something there.
     
    210superair likes this.
  28. samurai mike
    Joined: Feb 24, 2009
    Posts: 506

    samurai mike
    Member

    be it cinnamon or in the hay. i could use a roll about now!
     
  29. Your on a roll.....going to break 500 !
     
    King ford likes this.
  30. AngleDrive
    Joined: Mar 9, 2006
    Posts: 983

    AngleDrive
    ALLIANCE MEMBER
    from Florida

    Or he might just have 'rolled over' :D
     
    King ford likes this.

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