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Post by holdenboy on Sept 10, 2006 18:34:13 GMT 12
I am looking for some advice. I do not have the regulation 50mm below the top bar on my roll cage. As it is under 760mm x 760mm i do not require a roof plate. We have looked at lowering the seat and this can be done but leads to extensive relocating of many things in the cockpit and is a pretty major job...not to mention making a cramped space even tighter!
I have been told that putting a curved roof plate and 2x bars over the existing cage would be a solution. Has any one done this or have any ideas that could help out..... The rule book is pretty clear on roll cage modifications being out of the question, but opinions seem to differ.
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Post by busterbell on Sept 10, 2006 18:54:30 GMT 12
this topbar u refer too, is this bar above the drivers head and connected to either side of the roll cage??
or is this bar the top bar on each side of your roll cage?
and are u wishing to install a roofplate, preferring to have one.?
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Post by holdenboy on Sept 10, 2006 19:02:50 GMT 12
The bar either side of my cage.
I think i would feel safer with a roof plate too.
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Post by busterbell on Sept 10, 2006 20:06:51 GMT 12
hmmm
im no expert, but unless you move the seat or alter the height of the cage then you wont ever have the required clearance from the bars you mention. the fitting of a curved headplate will not alter that fact.
if you do happen to fit a head plate weld it on both sides, inside and outside, something that i have been failed on at greensheeting for only having it welded on the top side.
someone else might be able to offer a solution too you, but i dont see no easy one.
unless you start shrinking. ;D ;D
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Post by holdenboy on Sept 10, 2006 20:32:28 GMT 12
What if i added 2 new bars going across the top of the cage and weld the plate to them. Would the rules would now mean 50mm from the plate or will they still measure from the top edge of the outside roll bars.
Is this considered a roll cage modification???
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Post by busterbell on Sept 10, 2006 21:03:20 GMT 12
as i read the rules you still must maintain 50mm clearance between your helmet (remember that its helmet and not head) "and the top line of rollcage" one would assume that that is measured from the bottom side of roll cage. im refering to rule t11-2-7 g this is the only place i can see that refers to any kind of clearance requirements. i suggest that you get in touch with your local cheif scrutinneer for clarification as at the end of the day it is he that waves the big stick around. you can try snz via email but dont expect a prompt reply. i havn't actually tried to call them before so no idea what kind of nightmare that would be. ;D all sorts of funny things can happen when you are no longer on 4 wheels. i reckon the less things there are to headbutt the better  |
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Post by holdenboy on Sept 10, 2006 21:26:03 GMT 12
Rule t11.2.7 (g)
Plating: A 300mm x 300mm x 3mm steel plate above driver's head to be welded on four sides to adequately protect driver's head, and have a minimum clearance of 50mm between driver's helmet and the plate. Where the rectangle forming the top of the rollcage is 760mm x 760mm or less, measured from outside of pipe, and the 50mm clearance between driver's head and top line of rollcage is maintained, no plating is required.
The way i interperate this is if your head clearance doesnt meet the specs of 760x760 and 50mm below top line, then a plate is required. If this is the case, then adding extra bars to attach the plate too would be legal, as the minimum plate size is smaller than minimum roll cage dimentions.
so, curving those new bars and plating the top will give more head room.
Thank you for your advise so far... its really challenging the old grey matter to crack this one.
I will definatley be contacting the cheif scrutineer as i want to get this right. ;D
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Post by busterbell on Sept 10, 2006 21:49:09 GMT 12
yes there seems to be no reference to a rule regarding the 50 mm head clearance between head and cage unless you are not running a head plate.
one would assume though that there is a 50mm head clearance thou. between head and cage regardless.
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Post by Roaddog on Sept 11, 2006 18:02:24 GMT 12
If I was you I would ring Phil Game on 0800 steering he has done lots of rollcage ajustments and would not mind giving advice
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Post by Rusty on Sept 11, 2006 20:11:52 GMT 12
cut it off and build a new one
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Post by MattH on Sept 12, 2006 9:55:13 GMT 12
On my old car I was right on the 50mm clearance, I actually took some padding out from the bottom of the seat just to give it that little bit more.
From what I understand you need the 50mm whether you have a plate or not
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Post by doing_it_sideways on Sept 12, 2006 18:32:40 GMT 12
cut it off and build a new one i agree, but do it through a professional chassis person. i recon the more head room the better right? i mean if ya go over ya gunna move arent ya and the first place ya gunna go it towards the roof.. head vs steal cant be that good aye!!! |
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Post by busterbell on Sept 12, 2006 19:30:17 GMT 12
reminds me of a story of a nelson tq racer that had caught his mounting buckle on his belt on the car somewhere. did his belts up per usual, went out to race, had a whoopsie (multiple times i might add) and during all this turbulance his mounting buckle freed up which loosened his belts and his head popped out the top of the cage.
now he survived the roll fairly unscathed cept for the fact his head got impaled into the track resulting in some very nasty neck injurys.
so just a tip to be extra careful when installing your belts and to check there are no twists in your belts when you do them up.
you never know when you might have a whoopsie either.
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Post by mrelshauno on Sept 13, 2006 7:47:11 GMT 12
Thats good advice. Sounds nasty.
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Post by mod67c on Sept 13, 2006 18:42:04 GMT 12
Best bet would be to have a new hoop and forward bars fitted to the max height. This can be done various ways but cutting and welding in new frame to correct height would save a lot of stress.
Head clearance is the one of the first checks done at green sheeting so pays to have it right.
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Post by holdenboy on Nov 22, 2006 18:40:49 GMT 12
Sorry for being slack...I should have up dated with our remidy....
We ended up lowering the seat ;D Now plenty of head room.... thanks for all the tips..
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Post by porry41 on Nov 22, 2006 19:30:33 GMT 12
i remember a saloon car super it was too had that problem so they put the porter power in there & pushed her up a couple of inches guess what it cost them a whole new roll cage but we all no these super guys they no it all lol ;D hic couldnt happen to a nicer fella .!
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