Custom Roll Bar

Tech tips and how to's

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speedbug78
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Custom Roll Bar

Post by speedbug78 » Fri Jun 21, 2019 1:04 pm

I have a roll bar in my car. I think it is an Autopower one? You can clearly see it in the rear view mirror. I would like to build a better fitting roll bar, rather than modify this one, and would like suggestions, ideas, dimensions etc.

Here are the minimum requirements from NHRA:

Roll_Bar.png

Any idea how much taller I can go from the one I have and still get the top open/closed?
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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Fri Jun 21, 2019 1:13 pm

Also, I believe it is legal to have 1 bend in the door bar, and to have them swing out.
I've been in/out of a few cars with swing out bars, but never owned one. Any idea on which is the best way to do it?
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Alvin
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Re: Custom Roll Bar

Post by Alvin » Fri Jun 21, 2019 1:38 pm

speedbug78 wrote:
Fri Jun 21, 2019 1:04 pm

Any idea how much taller I can go from the one I have and still get the top open/closed?
Lots of questions to ask before we can help. Most obvious: Do you have a soft top/hardtop that you make measurements from? Without those, other's dimensions will vary wildly depending on style and how they mount their roll bars.

-Are you building the roll bar primarily for safety or to meet minimum requirements listed in your picture?
-How tall are you?

For starters, with a helmet on perform a "broomstick" test by laying one across the windshield/roll-bar and measure your helmet clearance.
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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Fri Jun 21, 2019 2:37 pm

Soft top
I'm 5'11"
Primarily to meet the requirements, but would like to increase safety over the bar I currently have.

I think the broomstick would be riding on my helmet, not the bar right now, but I'll check when I get a chance.
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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Fri Jun 21, 2019 10:54 pm

Here is my roll bar, looks ok.
Roll_Bar2.jpeg


Until I sit in the car. As long as I don't need my head, this roll bar is probably fine.

Roll_Bar.jpeg


There is about 4" between the roll bar and the soft top when it is up. I'll probably need a shorter, or more laid back seat.
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RCMike
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Re: Custom Roll Bar

Post by RCMike » Fri Jun 21, 2019 11:19 pm

An FYI.. That windshield will not hold the car in a roll. Your broomstick should go to the valve cover...

If you are building it for safety, and going to sit in a stockish seat, forget the top. It will not clear.

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Re: Custom Roll Bar

Post by speedbug78 » Fri Jun 21, 2019 11:42 pm

Yes you're right of course about the windshield. Maybe I should just cage the car, ugh that'll add a couple hundred pounds. I'd like to keep the top, so changing the seat is the way to go for me.

NHRA cage requirements:

Cage.jpeg
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Mike Unger
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Re: Custom Roll Bar

Post by Mike Unger » Sat Jun 22, 2019 7:25 am

What is your goal here? Are you planning on racing in NHRA with a roadster?
If you are thinking about road racing then I would look at SCCA for roll bar requirements. Those specifications will pass any vintage racing requirements too. In general, a race car doesn't make a good road car and visa versa. If you have a proper racing roll bar/cage you would want to make sure your bare head or extremities can't hit it in an accident when on the street. As far as weight goes when putting in the cage you generally strip out anything else that isn't needed for racing so the weight is saved there. I built a cage in a Honda S2000 and used almost 120 feet of tubing and the car weighs 600 lbs less than a stock car.
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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Sat Jun 22, 2019 2:38 pm

Street/strip roadster. It will be a compromise. I played around with a racing seat and some measurements. I may still be able to do the roll bar if I raise it up like 3". Will post pics in a bit. I don't know much at all about scca racing.
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theunz
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Re: Custom Roll Bar

Post by theunz » Sat Jun 22, 2019 4:49 pm

Road racing is 20 or 30 minutes of fun at a time instead of 10 or 15 seconds of fun at a time. Both however, are fun!
__________

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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Sat Jun 22, 2019 9:59 pm

Here I've positioned the seat so my head can't hit the roll bar, and aimed the measuring stick down at the engine. If I raise the bar 3.5" it should be about right.

Roll_Bar_Measuring2.jpeg
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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Sat Jun 22, 2019 10:00 pm

It might look a bit goofy with the top down though?
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Alvin
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Re: Custom Roll Bar

Post by Alvin » Sat Jun 22, 2019 11:06 pm

speedbug78 wrote:
Sat Jun 22, 2019 10:00 pm
It might look a bit goofy with the top down though?
Are you sure you need an extensive, multi-point cage to race?

Here's a caged TR6 with a v8 swap, slicks, etc...looks like the top fits too!

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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Sat Jun 22, 2019 11:17 pm

For 11.50 or slower (up to 13.99 I think?) in a convertible I need a roll bar at any NHRA event. To qualify as a roll bar I'll need to have what I posted in the first pic. I could use the bar that is in the car if I added a cross bar, door bar and attached it all to the frame.

The drawbacks to the existing bar are it shortness and weight. If I build a new bar with chromoly rather than mild steel it should way about the same as the existing bar.

What about you scca guys? I see you running roll bars. What are your requirements? How do they fit your cars?

Thanks for the ideas! It makes me think and will turn out better in the end.
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speedbug78
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Re: Custom Roll Bar

Post by speedbug78 » Sat Jun 22, 2019 11:24 pm

That's a pretty cool TR6 btw. He's caged and running 11 flat. If he could get the wheel spin under control the 60' would be quicker. Are you sure that's a v8 swap? I'm hearing turbo's spooling, and there always seems to be a v8 in the other lane. Anyway, v8 or not its cool. Thanks for sharing!
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