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View Full Version : 6pt rollbar w/removable bars in convertible



71OLDS
04-23-2008, 11:33 AM
Hi everyone,

Let me start by apologizing for how long this post is going to be. Lots of thought and research behind this. I'm still trying to find a way to do what most of this section has said can't be done. I'd like to be able to have 4 or 5 "track" days a year w/my 442 convertible and use it for good weather pleasure cruises/shows etc the rest of the time. Track days could include 1/4 mile runs, VIR (Virginia International Raceway club) open track days, solo II racing in Fed Ex stadium parking lot, etc. etc. All of the track days require a roll bar w/my convertible to attend. I know each has it's own set of rules (NHRA, SCCA, etc). I've read through most of the hand books and think I can do MOST of what I want to do w/a 6pt some say 5 pt is OK but basically something like this:

https://static1.pt-content.com/images/pt/2008/04/rollbar-1.gif?t=1208976740

...the problem is I only need this a few days a year but without it I can't do ANY track days (maybe 1 run at local track faster then 13.49) VIR = no go, SOLO II = no go etc. Convertibles need rollbars and I understand and support safety.

So the other 359 days a year I don't want or need a rollbar. Originally I thought I could just go w/removable door bars and a removable crossbar in the back. But I also want to be able to take passengers for a cruise in the back seat on occassion. So my question is about removable down bars. I've never heard of anyone else doing this. I know even the removable cross bar is a no no for some tech inspectors but I think it would be easy to hide this type of removable part:

https://static1.pt-content.com/images/pt/2008/04/m589dg-1.jpg?t=1208977538

Now I'm sure there could be some strict inspector at a certain track or maybe the VIR guidlines are more stict then my local 1/4 mile track ...so if I'm told I can NOT race because of ANY of the removable bars then so be it. That is a risk I'm willing to take. Obviously I could make the removalbe parts harder to see by covering w/padding etc. But my question is on the safety. How much am I compromising (safetywise) to have removable bars? That's a risk I don't want to take. It seems like these bars would still be extremely secure and solid but I'm no expert on this.

Here are some more pics:

Here's my back seat...tons of room back here and a great ride for passengers. Would hate to lose use of this:




https://static1.pt-content.com/images/pt/2008/04/2106rearflushmount_speaker-1.jpg?t=1208977793

Here's a 71 Mustang conv w/a 4pt (actually this car has removable door bars too but not sure about a cross bar)




https://static1.pt-content.com/images/pt/2008/04/2106Power_Tour_2001_San_Bernardino_-1.jpg?

So if these 2 down bars were removable with the allen key part shown above (one on top by the main hoop and one below in the seat well), then the back seat would still be safely usable when needed.

What I was hoping to do is install the main hoop and replace the stock lap belts w/3 pt belts attached to the hoop like this:


https://static1.pt-content.com/images/pt/2008/04/rollbar1fz8-1.jpg?t=1208978235

Then add the door bars, cross bar, and down bars all with the removable allen key parts. I would like to cover the main hoop w/a white yearOne type (or mustang light bar) like this:

https://static1.pt-content.com/images/pt/2008/04/161-1.jpg?t=1208978393

So most of the time I would run just the main hoop and maybe the down bars for support (only have back seat passengers maybe 20 times a year) running the 3 pt belts front and rear. Then on my track days I could install all the bars, add my 5 pt harness, install my padding (all in white to match interior and yearone cover) grab my helmet and off I'd go.

OK - feel much better now. Been going round and round my head with this for a while. Again sorry for this being so long please feel free to comment positive or negative. I'm really interested in hearing what safety issues I will have w/the removable bars. Thanks for everyone's help!

-Joe

jason@gmachine
04-23-2008, 11:59 AM
here is the solution to the removable section.

https://static1.pt-content.com/images/noimg.gif

https://static1.pt-content.com/images/noimg.gif

unlike the ones you pictured,these interlock. That is where the strength is, the forces are on the interlocking part of the solid 4130 machined unit and not the bolts. They are bullitproof and have held up to the most extreme accidents where the tube tears apart and the clamp is just fine.

https://static1.pt-content.com/images/noimg.gif

https://static1.pt-content.com/images/noimg.gif


jason

jason@gmachine
04-23-2008, 12:02 PM
here are some more shots of the machined unit.

https://static1.pt-content.com/images/noimg.gif

https://static1.pt-content.com/images/noimg.gif



jason

71OLDS
04-23-2008, 12:03 PM
Thanks Jason. So does this mean w/those parts you think safety would NOT be an issue even on removable down bars?

Have you ever heard of anyone else using removable down bars so the back seat could be safely used?

jason@gmachine
04-23-2008, 12:08 PM
Thanks Jason. So does this mean w/those parts you think safety would NOT be an issue even on removable down bars?

Have you ever heard of anyone else using removable down bars so the back seat could be safely used?

Safety is not an issue with these, If they bitch about it than they have no clue want they are talking about. When done correctly and painted, they are very hard to even notice. I TIG weld them in with a fliush surface so that after paint it is very hidden. I would trust my life to them and the life of any of my customers.

Yes, i did some a while back, i dont have any pics. sorry.


jason

71OLDS
04-23-2008, 12:26 PM
Thanks again Jason. Where are you located?

jason@gmachine
04-23-2008, 12:49 PM
signal hill/Long beach
CA.

you can call me at the shop
562 595 5410


jason

67 455 Bird ragtop
04-25-2008, 06:33 AM
These look pretty stout. But will they pass tech ??? If they wil I may look at updateing my cage with these for the side bars for daily driving. Also, who makes these ???

71OLDS
04-26-2008, 08:29 AM
Jason,

https://static1.pt-content.com/images/pt/2008/04/Picture_067-1.jpg?t=1209226705

How short can the "stem" part be and still maintain its strength? 2" 3"? Just trying to get an idea how far each removable part will have to stick out when not being used.

The one in this pic looks to be about 3". Is that the minimum or can you go shorter. I'd like them to be as short as possible since MOST of the time there will be no bar attached. But if they have to be 4" to maintain strength I'd rather be safe.

Also could you let me know the price for these parts? PM is fine. I would need 10 of them. 2 for each door bar, 2 for the cross bar, and 2 for each down bar.

Wish you were on east coast so I could let you do the work...

Thanks again for all your help!

-Joe