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  • #21

    Re: Designing road race truck chassis, could use help.....

    TC there is no reason to have the bar go all the way to the back of a non leaf spring frame. There is no weight to carry and the load would be unsupported for to long a distance. It looks much better, the "Back" bars should land on top of the spring/shock mount to help with the load from them. With limited supports I would use a cross bar comming down from the left top to the door X bar at the right top at the main hoop. I also would add a X in the top of the door bar to the rear rails at the hump for the axle.
    You should cage the whole thing not just half of it........Caging to the rear of the car/truck will make the rear a lot more stable, right now there is nothing going to be there but lateral braces, what's going to prevent the frame from twisting under hard cornering..........

    Also aren't there some rule books that he could be looking at..........No need to build a cage and then go to the track and them tell you you didn't do it right.........Size of tubing, thickness of tubing and tubing placement all are major factors and if the rules require tubes to be place a certain way or in a certain design, it's best to know before hand than have to redo it later.........
    Last edited by TC; April 17th, 2012, 11:42 AM.

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    • #22

      Re: Designing road race truck chassis, could use help.....

      I would take some ques from this pic......... This is a Nascar COT design..........

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      • #23

        Re: Designing road race truck chassis, could use help.....

        TC, we will see how this goes, "I dont See you"
        2007 SBN/A Drag Week Winner & First only SBN/A Car in the 9's Till 2012
        First to run in the .90s .80s and .70's in SBN/A
        2012 SSBN/A Drag Week Winner First in the 9.60's/ 9.67 @ 139 1.42 60'
        2013 SSBN/A Drag Week, Lets quit sand bagging, and let it rip!

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        • #24

          Re: Designing road race truck chassis, could use help.....

          TC, we will see how this goes, "I dont See you"
          Just my opinion Buddy, just my opinion........Take it as you will.......

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          • #25

            Re: Designing road race truck chassis, could use help.....

            Looks good to me... I like the light blue removeable one!
            Jeff has it on the nail head! Go to the top of the spring mounts if coil sprung
            On our derby cars we are not allowed to do that so we do it like the drawing shows but not attached to frame (a rule thing), then we run chain from the tops of the humps to the axle tubes... Same principle
            The COT impractical for street driven cars... And they are made to be bumped and bump.. Apples/oranges...

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            • #26

              Re: Designing road race truck chassis, could use help.....

              I may well have missed it, but I didn't see any particular class or rules requirements so for a DD I'd look at ease of entry/exit and the ongoing ability to work in the vehicle over time. More bars equals more pain and suffering, good thing he's young. The removable door bars are a good idea IMHO. The big question is how it ties through the cab structure to the frame itself. I'd be tempted to follow either NHRA or SCCA/NSRA or SCTA/ECTA rules for roll bars/cages as what starts as a fun vehicle often morphs into something that has to pass a tech inpsection or get a certification.
              Drag Week 2012 - Winner Street Race Big Block Naturally Aspirated - Big hat no horses Drag Week 2013 - Watching the live feed Drag Week 2014 - Maybe I'll go faster with a 1000 fewer pounds?

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              • #27

                Re: Designing road race truck chassis, could use help.....

                CDMBill, 2 nd post, "auto cross, time trials". Doesn't seem to be a governing body... SCCA?


                Looking at the COT. Frame, I see where the top of the humps are tied in... Prolly for your application, one to the middle MAY be sufficent? Like Bill says...rules/governing body build would be best...
                We all have ideas... Bill is in drags (right?) I am in demolition derby... Need a road racer's imput...
                Last edited by Deaf Bob; April 19th, 2012, 10:25 AM.

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                • #28

                  Re: Designing road race truck chassis, could use help.....

                  I'm restoring my old IMSA Gremlin and I have been doing some research, My plan is to run both vintage events, and some SCCA solo stuff.
                  The SCCA solo rules are more strict than the vintage rules, so I'm basically building my car to the SCCA solo rule book.
                  I would recomend you do the same, then you covered for just about anything you would want to do with it.

                  Remember the NASCAR stuff is built to run 200 mph next to brick walls, a bit much for most 'street/autoX cars. Still a good basis for reviewing the latest design in cages.

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                  • #29

                    Re: Designing road race truck chassis, could use help.....

                    PER Qadrabind: I can't speak of a "normal" panther chassie but the 03 Marauder had parralle bars and a watts link. IMHO except for overall width a pretty good set up for a fun driver/track car. Like the 4 valve MOD motor it carries, way to wide for all but a full size Ford,think 64 up Galaxy.

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                    • #30

                      Re: Designing road race truck chassis, could use help.....

                      So, as it stands; I have read through pages and pages of rule books that apply to roll cage construction for NASA, FIA and the SCCA and pored’ over hundreds of pages of banter concerning roll cage construction.

                      I can now say with some certainty, that no pure consensus exists, when it comes to chassis construction. There is a fine line between structures that absorb and those that do not absorb high impact loads and cases made for either side of building a highly rigid structure over one with ample crush zones...CONTINUED ON PAGE 4
                      Last edited by OHC230; April 23rd, 2012, 09:19 AM.
                      sigpic"Take most people, they're crazy about cars† I'd rather have a goddam horse. A horse is at least human, for God's sake."

                      Jerome David Salinger

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                      • #31

                        Re: Designing road race truck chassis, could use help.....

                        I come away with the feeling that the newer trends in chassis design, seem to be coming from Foreign markets. I can see a future where Impaxx foam becomes an integral part of race car construction along with highly deformable, impact absorbing structures. There seems to be a conspicuous lack of tube bends in many of the newer foreign chassis designs, which inevitably leads to greater chassis stiffness/ per a given weight.

                        I think some of these attributes are worth pursuing in a new design, although the contradictions in design philosophy (rules)make it difficult for anyone in the sport to advance.




                        SCCA RULES FOR ROOL BAR HOOPS

                        3.3.2 Roll Bars

                        1. One continuous length of tubing must be used for the hoop member
                        with smooth continuous bends and no evidence of crimping or wall
                        failure.



                        A BLATANT VIOLATION OF THE RULES



                        A COUPLE OF LINKS IN CASE YOU'RE INTERESTED

                        http://www.racecar-engineering.com/a...ure-is-coming/

                        http://www.dowautomotive.com/products/impaxx/300.htm
                        Last edited by OHC230; April 21st, 2012, 09:33 AM.
                        sigpic"Take most people, they're crazy about cars† I'd rather have a goddam horse. A horse is at least human, for God's sake."

                        Jerome David Salinger

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