Coot’s race buggy bulid

Coot

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Joined
Aug 5, 2023
Member Number
6675
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22
I finally started working on this project,haven’t made a lot of progress but I got the engine and trans out of the old race Cherokee ,it was a 2 door 6.0 th400 np241,Dana 60 rear hp44 front,rear radiator.Me and my brother raced it awhile,had alot of fun in it but it was time to upgrade to something better. The transfer case is a magnitude case with stock 205 guts.im getting ready to weld trusses to a sterling 10.5 and a 2005 Dana 60. I’ve never built anything like this before more of mechanic than fabricator so any advice from you guys I appreciate.
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mobil1syn said:
do yourself a favor, cut these out until you are done with the exception of mounting the door skins.

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add them back like this
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I might do that definitely a jungle Jim getting in there!
 
jhama78 said:
Fawk yeah! Will be cool to see one of Timmayys Chassis get built up. What size tire ya running? Sub'd for updates
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Thanks! I have some 40”s I plan to build it to clear and be able to run,if we can race ultra 4 it’ll run 37” for 4800 class
 
Tim won't build 1.75 chassis anymore. all the new ones are 2"

FWIW mine is one of the original 1.75 chassis from 10 years ago, weighed 4260 lb on a cat scale a few months ago in 4800 trim with no spare and 5 gal of fuel.
 

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SLOWPOKE693 said:
Why? The triangle below the A pillar is more than enough to support and spread any load that the A pillar would ever see in a crash. Adding that 3rd tube is just extra weight for no real gain.
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i like the vertical load path, plus it will give the door panel support when he pivots around that part of the chassis in the rocks.
 
Because the two / \ bars spread the load better than a single point and because the tube right above and below the tube you want to add will pivot around rocks just as good because they are horizontal slide points not vertical hang up points.
 
SLOWPOKE693 said:
Because the two / \ bars spread the load better than a single point and because the tube right above and below the tube you want to add will pivot around rocks just as good because they are horizontal slide points not vertical hang up points.
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Look at the structure under where the added 3rd vertical A-pillar support bar lands. It's It's fully supported. The actual A-pillar itself lands in a weaker spot. There's nothing supporting it from underneath.

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gt1guy said:
Look at the structure under where the added 3rd vertical A-pillar support bar lands. It's It's fully supported. The actual A-pillar itself lands in a weaker spot. There's nothing supporting it from underneath.

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I saw that too. I still wouldn't bother with the vertical bar. The / \ bars will share the load and not focus it on a single point like a vertical bar would. Putting a vertical bar in wouldn't hurt any but at the same time isn't needed and isn't going to make that joint any safer than it already is. My brain is in "race mode" all the time and adding unnecessary weight to a chassis for no good reason goes against my thought process.
 
And I'm almost positive that Liquid Iron Industries did FEA analysis on those chassis so he could sell them overseas and meet FIA regulations. How many chassis builders in the sport can claim that?

I'd trust that chassis as is and without question.
 
I would add the vertical tube for anti-intrusion purposes.
If you drop it on it's side, this would help preventing a big rock or similar to poke in.
 
Also, I don't understand why the front tube isn't landing on the actual junction.
Should be green, red spot isn't supported.

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I wouldn't want that 3rd vertical tube from the wing window node to the rocker. the two that are there are more than enough and closing that opening with the vertical tube would make the interior impossible to work on. my door bar tubes were only added at the end of the build for this reason.

SLOWPOKE693 said:
And I'm almost positive that Liquid Iron Industries did FEA analysis on those chassis so he could sell them overseas and meet FIA regulations. How many chassis builders in the sport can claim that?

I'd trust that chassis as is and without question.
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i believe that is true. fun fact. there are more eliminators in Istanbul than there are in the states. odd requirement they had was opening doors.
 
SLOWPOKE693 said:
And I'm almost positive that Liquid Iron Industries did FEA analysis on those chassis so he could sell them overseas and meet FIA regulations. How many chassis builders in the sport can claim that?

I'd trust that chassis as is and without question.
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Never heard of any of this, apparently live under a rock. Quick 101 please, FEA? FIA? And what exactly are they analyzing.
 
this is the big difference in FIA aka euro cages vs the us. i believe if you want to deviate from the continous tubes in the main structure the you have to get an engineer to sign off on it.

vetteboy79 you got any details to add?

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Those specs seem to be for a cage in a full bodied vehicle. Not sure how much they would differ in a full tube chassis.
 
mobil1syn said:
this is the big difference in FIA aka euro cages vs the us. i believe if you want to deviate from the continous tubes in the main structure the you have to get an engineer to sign off on it.

vetteboy79 you got any details to add?
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Overseas needed to have a continuous B-pillar hoop so that version of the chassis was modified to accommodate per FIA spec. Couldn't tell ya what or if any FEA stuff Tim did on it, but I guess it's good enough that there's a pile of these things racing/wheeling in eastern Europe. They do look a little different than the ones we have around here.
 
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