Topic: Main Hoop Spreader

On the main roll bar behind the driver, there are typically a spreader and a diagonal. Is it required that the spreader be one piece and the diagonal be cut to fit it?

Re: Main Hoop Spreader

By spreader, do you mean the harness bar and the anti-bow bar?  If so, then I think they prefer the diagonal be one piece.  See the "how not to fail tech"

https://24hoursoflemons.com/wp-content/ … 051817.pdf

Re: Main Hoop Spreader

I've seen it both ways but if the diagonal is 2 pieces, the two pieces need to be in the same plane (i.e., the two can't be offset on the harness bar- what you are calling the spreader).

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Re: Main Hoop Spreader

FWIW, the official rules do not call out the diagonal by name as needing to be one piece, however the "how not to fail tech" PDF is worded as "must be one continuous bar". Safest route is to just make the diagonal a single bar and split the harness bar into two pieces.

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Re: Main Hoop Spreader

I'm no expert by any means but I've always taken it that since the anti-bow bar is not mandatory then the diagonal has to be one piece otherwise it can't exist with the non mandatory parts. Like cheseroo said, I have seen the two piece pass tech though.

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Re: Main Hoop Spreader

TheEngineer wrote:

FWIW, the official rules do not call out the diagonal by name as needing to be one piece, however the "how not to fail tech" PDF is worded as "must be one continuous bar". Safest route is to just make the diagonal a single bar and split the harness bar into two pieces.

That is what we've done on all our builds. The diagonal bar is one piece and the harness/anit-bow is two bars on the same plane.

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Re: Main Hoop Spreader

The diagonal is one piece on two of our cars, and the harness bar is one piece on the other one. All have passed tech multiple times, so I'm guessing that either way is fine.

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Re: Main Hoop Spreader

ok, thanks, this car was raced in 2015 at The Ridge for the Lemons event. The Horizontal is used more for structure than just a harness bar. It currently has a solid diagonal.

Re: Main Hoop Spreader

that said, you do know your harness still goes there and has to meet the same "How not to fail tech" rules, right?

Re: Main Hoop Spreader

OnkelUdo wrote:

that said, you do know your harness still goes there and has to meet the same "How not to fail tech" rules, right?

Yes, the car currently has alum Kirkey seats with back mounts that I'm surprised passed. Once I get the Sparco's in there, it (the spreader bar) may need to move anyway. We've got a couple good 'advisors' that have built several Lemons cars. One ran their C3 Vette in Denver last week and were leading Cl A when the differential vented its housing.....