Re: What are the NHRA rules for attaching seat to roll bar?
[Re: Dodger440]
#688425
05/04/10 06:43 PM
05/04/10 06:43 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Are there any specific NHRA rules for how to attach the drivers seat back to the roll bar? The car will run 9.60, so it will have to be certified. Just want to make sure I do it right the first time. Thanks.
My seat does NOT attach to the cross bar bar it is real
close to it(might even touch when I am in it) and my
car is certed to 8.50 now(was 7.50 with the same set up)
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: MR_P_BODY]
#688426
05/04/10 06:52 PM
05/04/10 06:52 PM
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Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
ProStDodge
master
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master
Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
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2010 NHRA
6:2 UPHOLSTERY, SEATS
The driver’s seat of any car in competition must be constructed,
braced, mounted, and upholstered to provide full back and shoulder
support. The driver’s seat must be supported on the bottom and
back by the frame or crossmember. Except as noted in SFI
Specifications, seats must be bolted with four bolts (and nuts and
washers) on the bottom and one bolt in the rear into crossbar; all
bolts must go into frame or crossbraces. Ball-lock pins for seat
attachment prohibited in all classes. All seats must be upholstered,
or as noted under Class or SFI Requirements. All front-engine,
open-bodied, supercharged or turbocharged (gasoline or methanol)
cars running 7.49 seconds and quicker must have a flameretardant-
material-upholstered seat.
Properly braced, framed, supported, and constructed seats of
aluminum, fiberglass, carbon fiber, or double-layer poly
(accessory seats) permitted. Single-layer fiberglass seats must
have steel tube framework, 1/2-inch-minimum O.D., for support.
Aftermarket aluminum seats must have reinforced head rest.
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: MR_P_BODY]
#688427
05/04/10 06:58 PM
05/04/10 06:58 PM
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Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
ProStDodge
master
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master
Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
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Quote:
My seat does NOT attach to the cross bar bar it is real
close to it(might even touch when I am in it) and my
car is certed to 8.50 now(was 7.50 with the same set up)
Chassis certification is for the cage only. So it is possible to have an observant tech catch you on the lack of a "proper" attachment.
 
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: ProStDodge]
#688428
05/04/10 07:45 PM
05/04/10 07:45 PM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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Directly from the rule book:
Specifications, seats must be bolted with 4 bolts and nuts and washers on the bottom and one bolt in the rear into the crossbar. All bolts must go into frame or crossbraces.
09 rulebook, section 6:2 Page 271, gen regs
SRT DEMON ONE SEAT
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: ProStDodge]
#688429
05/04/10 09:12 PM
05/04/10 09:12 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
My seat does NOT attach to the cross bar bar it is real
close to it(might even touch when I am in it) and my
car is certed to 8.50 now(was 7.50 with the same set up)
Chassis certification is for the cage only. So it is possible to have an observant tech catch you on the lack of a "proper" attachment.
Well I guess I better look at putting a bolt in
some where back there... has never been a problem
for years now.... thanks for the info guys
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: MR_P_BODY]
#688430
05/04/10 09:47 PM
05/04/10 09:47 PM
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Joined: May 2006
Posts: 1,414
Stow ,Ohio
demon440
pro stock
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pro stock
Joined: May 2006
Posts: 1,414
Stow ,Ohio
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How is that possible? My brother is 6'1" and I am 5'5" we obviously can't keep the seat in the same position. 
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: demon440]
#688431
05/04/10 09:51 PM
05/04/10 09:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
How is that possible?
My brother is 6'1" and I am 5'5"
we obviously can't keep the seat in the same
position.
You could have a tube/rod mounted to the seat back
and a larger tube that the other tube/bar slides through
and different holes that you could put a bolt through
when you slide the seat
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Re: What are the NHRA rules for attaching seat to roll bar?
[Re: demon440]
#688432
05/04/10 09:54 PM
05/04/10 09:54 PM
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Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
cheapstreetdustr
master
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master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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mine has a tube welded to the roll bar..
and a slip tube welded to a braket that bolts to back of seat..
i drilled holes..and a clevis and cotterpin.
hold it in place...for adjustment.
i can move it about 4" fore or aft..if i need to.
fwiw
cheapst
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured
[image][/image]
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