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Trunk bar location on leaf spring car
#3092400
11/07/22 07:58 PM
11/07/22 07:58 PM
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Joined: Oct 2008
Posts: 370 Suffolk County, New York
1mean340
OP
enthusiast
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OP
enthusiast
Joined: Oct 2008
Posts: 370
Suffolk County, New York
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Any chassis guys here? working on mocking up a 10 pt cage for my 70 challenger. The car is going to have a caltracs mono leaf with assassin sliders. Wondering where the best spot for the trunk bars of the cage to land in would be (see pic) and if either at the crossmember vs further back towards the rear leaf spring perch has any benefit chassis wise?
Also, if there any major disadvantage to using bent trunk bars for passenger headspace vs straight bars? I don’t NEED the bends, probably won’t ever have passengers in the back but I like the look of the more hidden bent bars and it would be easy enough to throw a bend in them. I know straight bars are usually stronger but not sure if it makes enough difference to matter.
Thanks!
Last edited by 1mean340; 11/07/22 07:59 PM.
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Re: Trunk bar location on leaf spring car
[Re: 1mean340]
#3092470
11/08/22 12:06 AM
11/08/22 12:06 AM
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Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,209
New York
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The force required to buckle a straight bar (in compression) is wayyy more than a bent bar, which begins to bend in either direction very early.
Boffin Emeritus
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Re: Trunk bar location on leaf spring car
[Re: 1mean340]
#3092477
11/08/22 03:03 AM
11/08/22 03:03 AM
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Joined: Feb 2015
Posts: 2,079 CA
crackedback
top fuel
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top fuel
Joined: Feb 2015
Posts: 2,079
CA
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Run a bent bar from the roof line through package tray to spot one, just on top of the shock crossmember if you are using it.
If you are concerned about the very back having stability issues. Run a J bar from the first down bar at 1, up tight to the trunk gutter/lid, and drop it at spot 4
Give yourself enough room to get the battery out easily.
Last edited by crackedback; 11/08/22 03:05 AM.
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Re: Trunk bar location on leaf spring car
[Re: crackedback]
#3092522
11/08/22 10:45 AM
11/08/22 10:45 AM
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Joined: Jan 2004
Posts: 4,570 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,570
Motor City
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Mine I removed the upper shock mount piece. I added a bar between the frame rails that my rear window bars go through the trunk and land on this bar. It is also my upper shock mount bar and my anti-roll bar tie into that same cross bar. My car is also still leaf springs with Caltracs.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Trunk bar location on leaf spring car
[Re: cudaman1969]
#3092803
11/09/22 11:11 AM
11/09/22 11:11 AM
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Joined: Jan 2004
Posts: 4,570 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,570
Motor City
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Since my Duster will be running in stock class I ran my bars similar to 6pk s but I ran the trunk bar back to the top on spring box. In fact both front and back spring boxes are tied into the cage. These places are where your car rotates from so they need to be strong. I also have bars going to top of shocks from those back bars. IMO you want the car as stiff as possible with the least amount of bars, a triangle is the strongest configuration in the universe. My rear trunk bars tie into the rear leaf spring perches and has a bar tieing them between the frame rails that is also my parachute mount bar as well. I also have bars running down from my main hoop through the floor to the top of my front leaf spring perches as well. Unfortunately, they punch right through the rear seat though.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Trunk bar location on leaf spring car
[Re: racerx]
#3092836
11/09/22 01:06 PM
11/09/22 01:06 PM
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Joined: Jan 2004
Posts: 4,570 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,570
Motor City
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Cool Shirt, pumps ice water through my fire suit at the race track and for beer, water and pop at cruise nights and car shows.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Trunk bar location on leaf spring car
[Re: 6PKRTSE]
#3092886
11/09/22 04:03 PM
11/09/22 04:03 PM
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Joined: Jan 2004
Posts: 8,290 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,290
fredericksburg,va
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Since my Duster will be running in stock class I ran my bars similar to 6pk s but I ran the trunk bar back to the top on spring box. In fact both front and back spring boxes are tied into the cage. These places are where your car rotates from so they need to be strong. I also have bars going to top of shocks from those back bars. IMO you want the car as stiff as possible with the least amount of bars, a triangle is the strongest configuration in the universe. My rear trunk bars tie into the rear leaf spring perches and has a bar tieing them between the frame rails that is also my parachute mount bar as well. I also have bars running down from my main hoop through the floor to the top of my front leaf spring perches as well. Unfortunately, they punch right through the rear seat though. I still have all your pics when you where building car
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