Landracing Forum
Tech Information => Technical Discussion => Topic started by: oj on December 04, 2016, 10:23:53 AM
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I can't see where there is a minimum clearance for cage to helmet. The SFI specs show 4" behind the front hoop and I believe 3" from top of helmet to bottom of cage. But in reading LSR cars under construction I see much tighter clearances, like a 1/2".
Anybody have experience with what the tech guy will want to see? I understand there will have to be padding too.
Thanks, Oj
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Are those specs Maximums?
Do you have a rule book yet...
Don't start building without one... especially a Special Construction
1/2 inch from helmet to padding is more than we have... just don't build it so close that your helmet touches. We had to redo ours a couple of years ago when helmets jumped in external size. If the helmet touches the SFI padding the vibration will uncage your eyeballs.
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I am going to say don't pay attention to SFI specs. Is like people saying NHRA says this and that. SCTA and LSR is different. Read the rule book carefully. There are minimums/maximums for some clearances well laid out. Side to side is MAX 2" per side but see what Stainless said as well. Too small may be an issue. Over head is 3" minimum. And see what I said in here: http://www.landracing.com/forum/index.php/topic,16439.15.html reply # 23
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Don't make it any tighter than this :-o even after our rework helmet sizes continue to grow. The 3 inch overhead that Jack mentioned is a line running down the front of helmet to a line running down the front of the cage.
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Don't forget that the belts stretch and can let your head hit the roll cage.
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What Glen said...
don't have my 2016 book handy, is page 36 in 2015. But relevant paragraphs are 3.B1 and 2 and 3.C. Figure 3 specifically. Also, 3.A.3.
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My cage is really deep to protect my hands and arms---there is nearly a foot in front of my helmet--makes it harder to get in and out of, but much more protection---
also think about building your seat back to be able to recess the Hybrid Pro HANS device we may have to redo ours to deal with several of the issues mentioned for one of our prospective
drivers---toward what Sid, SS1 and others have said--- bottom line--it is much easier to build a fast car for a small skinny driver-- than for a large F A ed older owner/driver :-D :-o
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drivers---toward what Sid, SS1 and others have said--- bottom line--it is much easier to build a fast car for a small skinny driver-- than for a large F A ed older owner/driver :-D :-o
Hey wait a minute... Johnboy and I resemble that remark.... :roll:
Of course it is getting harder to get in and out, makes you think the firesuit isn't the only thing shrinking... does steel and aluminum shrink with age :?
:cheers:
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That Dodge stuff does shrink---I have documented it---it migrates to my belly---but then on second thought I sure as heck don't have abs of steel
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Fiberglass shrinks too...getting to be a real chore packing myself in my `32 3 window...... :cheers:
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drivers---toward what Sid, SS1 and others have said--- bottom line--it is much easier to build a fast car for a small skinny driver-- than for a large F A ed older owner/driver :-D :-o
Hey wait a minute... Johnboy and I resemble that remark.... :roll:
Of course it is getting harder to get in and out, makes you think the firesuit isn't the only thing shrinking... does steel and aluminum shrink with age :?
:cheers:
I have met both you guys and believe I outweigh you both in total (lol). I used to fit in a lay down car. Now I have trouble getting in an F150.
John
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The BED of an F-150? Geez, that's quite a -- bulk... :roll:
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. . . and with those aluminum beds, be careful where you step.
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The BED of an F-150? Geez, that's quite a -- bulk... :roll:
I knew I should be more specific around this group. That would be the front seat of an F150, Jon. Still, quite a bit of bulk, for sure.
John