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Re: installing a roll cage
[Re: wj440]
#1225633
05/01/12 09:09 PM
05/01/12 09:09 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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It should go from where you have the bend in your main hoop to the bottom of the knee loop... if you want to put a bend in the door bar you should put a bar in the goes from the door bar back to the main hoop... triangulate EDIT it might end up just below that bend in the main hoop... where the cross bar will go 
Last edited by MR_P_BODY; 05/01/12 09:11 PM.
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Re: installing a roll cage
[Re: wj440]
#1225635
05/01/12 10:42 PM
05/01/12 10:42 PM
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Joined: Jan 2005
Posts: 3,699
Newport, Mi
Evil Spirit
master
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master
Joined: Jan 2005
Posts: 3,699
Newport, Mi
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The rules don't locate the bar off the car - they locate it off the DRIVER. We put the pedals, steering column, and seat in, make the driver "fit", then locate the main hoop in the proper relationship to his head. We usually follow the B pillar (or rear of drivers window) for the angle of the main hoop. Granted, this approach makes a cage set up for a large or tall driver in the wrong spot for a short one, but it's easier to move the seat forward than it is to cut out the main hoop or crossbar. 
Free advice and worth every penny...
Factory trained Slinky rewinder.........
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Re: installing a roll cage
[Re: THE GLASS MAN]
#1225639
05/01/12 11:03 PM
05/01/12 11:03 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:
O-K, you have your roll cage in and it is certified for 8.50 and it is a full bodied car. Does it need a window net ? I say yes, but our cage builder says no, it doesn't need one. Who is right? 
I dont use my net at most tracks and no one says anything
but at National Trails they make me put it up... if
its certed to 8.50 you should have/use it
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Re: installing a roll cage
[Re: Evil Spirit]
#1225642
05/01/12 11:19 PM
05/01/12 11:19 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:
Quote:
I think he is talking about the main hoop and not the cross bar.
If he is,yes you want the main hoop close to the the door post/door latch area.Yes you can lay the hoop back up to 20*.I will have to double check that.The alignment to the door post isn't exact.You may adjust it to your liking within a few inches.
The way I read it he was asking about the door bar
EDIT
I think he might be talking the horizontal bar that
mounts behind the driver... that location is dictated
by the drivers height.. need to be below the shoulder
but no more than 3"(I believe)... check the NHRA
rule book)
Raff, by the way he references the angle of the window, I think he is asking about the (vertical) placement of the main hoop.
After RE-reading it again I THINK your correct
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Re: installing a roll cage
[Re: wj440]
#1225643
05/01/12 11:32 PM
05/01/12 11:32 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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Looking at the pic with the main hoopI would move it back about 3".. set a seat in there ON A ANGLE thats comfortable (so that the drivers legs are being supported by the seat bottom) and see where his head/helmet is located... with his foot flat on the floor(gas pedal).. thats how I set it up for customers... his head/helmet cant be behind the main hoop
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Re: installing a roll cage
[Re: THE GLASS MAN]
#1225644
05/01/12 11:41 PM
05/01/12 11:41 PM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
O-K, you have your roll cage in and it is certified for 8.50 and it is a full bodied car. Does it need a window net ? I say yes, but our cage builder says no, it doesn't need one. Who is right?
Quote:
6:3 WINDOW NET
An SFI 27.1 ribbon-type or mesh-type window net is mandatory on
any full-bodied car required by the rules to have a roll cage.
as usual it's a gray area. if the car is REQUIRED to have a cage then it is REQUIRED to have a net. so what happens if you're running a 10.50 car with a cage? it's not required (with unaltered floor/firewall) so even though it has a cage i don't see where it should have to have a net.
just like the stories of people running an expired harness in a class not required to have a harness.
i've heard of people getting bounced because the harness is expired...gimme a break. it's not ok to use a 25 month old, tugboat towing worthy three inch five point racing harness that there's absolutely nothing wrong with except greed but it IS ok to use a 40 year old two inch lap belt 
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Re: installing a roll cage
[Re: jamesc]
#1225645
05/01/12 11:47 PM
05/01/12 11:47 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:
O-K, you have your roll cage in and it is certified for 8.50 and it is a full bodied car. Does it need a window net ? I say yes, but our cage builder says no, it doesn't need one. Who is right?
Quote:
6:3 WINDOW NET
An SFI 27.1 ribbon-type or mesh-type window net is mandatory on
any full-bodied car required by the rules to have a roll cage.
as usual it's a gray area. if the car is REQUIRED to have a cage then it is REQUIRED to have a net. so what happens if you're running a 10.50 car with a cage? it's not required (with unaltered floor/firewall) so even though it has a cage i don't see where it should have to have a net.
just like the stories of people running an expired harness in a class not required to have a harness.
i've heard of people getting bounced because the harness is expired...gimme a break. it's not ok to use a 25 month old, tugboat towing worthy three inch five point racing harness that there's absolutely nothing wrong with except greed but it IS ok to use a 40 year old two inch lap belt
I know guys that cut the cert tag off... if its not
required and they are fine... my Rampage has a full
cage but I will run 10.0 or slower so I sure hope
I dont need a net(dont want one... its a street car)
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Re: installing a roll cage
[Re: wj440]
#1225646
05/01/12 11:59 PM
05/01/12 11:59 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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I suggest you start with the seat positioning first, as most the measurements will revolve around the drivers position in the seat. Main hoop needs to be within 6" of the rear, or side, of the drivers head, extend in height at least 3" above the drivers helmet with the driver in the normal driving position and at least as wide as the drivers shoulders or within 1" of the drivers door. Side bar must pass the driver at a point midway between the shoulder and elbow. Main hoop cross bar ( where you attach the shoulder harness), must be installed not more than 4" below, and not above, the drivers shoulders. My harness instructions pretty much say the same thing.
Fastest 300
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Re: installing a roll cage
[Re: jamesc]
#1225647
05/02/12 12:08 AM
05/02/12 12:08 AM
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Joined: Apr 2007
Posts: 1,165
Central Ohio, USA
Bigbeep
super stock
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super stock
Joined: Apr 2007
Posts: 1,165
Central Ohio, USA
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My two cents are that you should be building this cage with the current rule book on the bench with your tools, but I can give you this from the current NHRA rule book in general regulations.
Full-Bodied cars:
On full-bodied cars with driver in driving position, helmet must be in front of main hoop. If helmet is behind or under main hoop, additional tubing same size and thickness as roll cage must be added to protect driver. Main hoop may be laid back or forward, but driver must be encapsulated within the required roll-cage components.
Then it goes on to read of the different ways the cage can be mounted to the floor or frame depending on if it is a unibody or full frame type vehicle.
Again, I think you should pick a rule book up. I agree some of the wording may be confusing or vague. But it may clear up some "grey" areas. Hope this helps, Beep
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Re: installing a roll cage
[Re: Bigbeep]
#1225648
05/02/12 01:30 AM
05/02/12 01:30 AM
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Joined: Aug 2006
Posts: 687
Ohio
Chad Bittle
mopar
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mopar
Joined: Aug 2006
Posts: 687
Ohio
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thanks for all the replies everyone. He was unsure if that vertical bar could be leaned forward/back or had to be perfectly horiztonal. There are about 3 different angles to work off of to make it 'look right' inside the door jam. I was almost positive there was a rule about where the driver had to be in location with that bar. This will HOPEFULLY be a 10 second street/strip car. For now  Thanks again for all the quick replies.
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Re: installing a roll cage
[Re: wj440]
#1225649
05/02/12 06:38 AM
05/02/12 06:38 AM
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Joined: Mar 2006
Posts: 9,848
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,848
MI, usa
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Quote:
Well after five years... My son and I are finally getting started on our other project. My question Is.. Is there a right or wrong way to install the bar that goes in between the door jams. Over the years I've seen some that is parallel with the door jam.. Or leaning back with the contour of the side window. I was just wondering if there was a correct way to do this.
Thanks.. Walt
Yes you can lean it back to match the window post angle. Looks better ,mine is done like that. I E-mailed my division 3 tech director Rich Bowers every time I had a cage question (and saved the E-mails).
Good luck Doug
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Re: installing a roll cage
[Re: Chad Bittle]
#1225650
05/02/12 09:16 AM
05/02/12 09:16 AM
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Joined: Apr 2004
Posts: 12,339
somwhere
smokinwoody
I Live Here
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I Live Here
Joined: Apr 2004
Posts: 12,339
somwhere
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Quote:
thanks for all the replies everyone. He was unsure if that vertical bar could be leaned forward/back or had to be perfectly horiztonal. There are about 3 different angles to work off of to make it 'look right' inside the door jam. I was almost positive there was a rule about where the driver had to be in location with that bar. This will HOPEFULLY be a 10 second street/strip car.
For now Thanks again for all the quick replies.
I started doing mine...well I havent spent any time on it in the last month or so..
anyways, I think, what I saw in the pic, that you were trying to run parallel to the door frame?..in any case it has to be within 6" of the drivers helmet..you dont want to be sitting under it...
this is what mine looks like so far..sorta like yours..
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