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 Tank for Mini Marcos (currently 1 views) |
| jimnaylor |
Posted on: August 26th, 2011, 13:44:22
 Attachment: imgp0635.jpg - 72.89 KB (5352 views) |
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Big Member
Location: Bedfordshire
Posts: 222
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| The new leg without the bend.... which required a new cross brace and new door bars... £'s..... |
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Reply: 15 - 35 |
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| jimnaylor |
Posted on: August 26th, 2011, 13:55:40
Attachment: cage_now.jpg - 91.37 KB (5344 views) |
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Big Member
Location: Bedfordshire
Posts: 222
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This is how it was mounted in the front. The foot loads both the floor and the sill. Even better would be to have an even bigger plate extending on t the top of the sill.
The bars that go to the top of the front subframe can just be seen. Also the door bars are tight on the sill. We always thought that this was a last resort, if the cage is moving in a roll relative to the body the door bars would spread some load across the sills from front to back. The cross beam is tight on the centre tunnel for the same reason, but no spreader plate is fitted.
Having the rear cross beam means that the rear hoop is about 100mm further forward than if mounted directly onto the body infront of the wheel arch. That gives a cage nearer the driver and about 10mm higher. Not a lot but with the tiny head clearance of the MM that might make all the differance between breaking my neck or not.
It was the Roll Centre's idea, but mainly because they thought it needed to pick up as much of the suspension points as possible. They considered that they were the only points they could rely on. Even so they told me I was completely mad to be in it ! |
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Reply: 16 - 35 |
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| laurent laval |
| Posted on: August 26th, 2011, 14:52:47 |
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Baby Member
Posts: 13
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| Thanks a lot for all this details!!! |
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Reply: 17 - 35 |
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| Peter Bremner |
| Posted on: August 26th, 2011, 20:19:21 |
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Big Member
Location: Ongar, Essex
Posts: 410
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While your wallet is undergoing surgery, are you going to powder coat?
To put on multiple pictures, open an account with Photobucket (or similar), upload the pictures then copy and paste the IMG codes underneath each picture in the album. If you leave a line between each code, the photos will have a white line between them. |
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Reply: 18 - 35 |
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| jimnaylor |
| Posted on: August 27th, 2011, 12:19:48 |
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Big Member
Location: Bedfordshire
Posts: 222
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Thanks Peter for the info on posting pictures.
As for powder coating although I'd like to, I can't justify the cost or prep time so I'll just spray it. That's the reason the Roll Centre didn't paint it, the new bits are easy but the old bits more difficult.
This series of posts has made me think and if I was having a brand new cage built I don't think I'd go for the rear spreader bar, but just land in front of the rear wheel arches. But I would try and spread the load using similar sized plates. i.e. into both the top and into the rear beam and subframe. The minimal gain in height and side to side protection gained by the bar is probably not really worth the complication or weight. |
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Reply: 19 - 35 |
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| Phil Smethurst |
| Posted on: August 28th, 2011, 00:00:22 |
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Medium Member
Posts: 150
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Sorry if this doesn't work - I'm just trying Peters advice and have opened a photobucket account to try and post a picture of my own rollcage. I would like to modify it as per Jims car to pick up the front subframe.
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Reply: 20 - 35 |
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| admin |
| Posted on: August 28th, 2011, 14:43:19 |
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 Administrator
Location: Maidenhead, UK
Posts: 2,383
Reputation: 1 (tot: 1) |
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There's no reason why you shouldn't do multiple posts with one photo per post. I've put a size limit on attachments to stop very large images being uploaded but 153.5kB should e adequate.
The interior looks nice! |
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Reply: 21 - 35 |
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| jimnaylor |
| Posted on: August 29th, 2011, 17:57:15 |
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Big Member
Location: Bedfordshire
Posts: 222
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Reply: 22 - 35 |
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| dalla |
| Posted on: August 29th, 2011, 20:34:42 |
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Medium Member
Location: Aarhus Denmark
Posts: 112
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| This will also be one of my first things to do on 7012. I was wondering if would be a good idea to attach the drivers seat to a frame seperate from the body welded the rollcage? What happens if the roll cage bolting points break? |
Mini Marcos Mk.II 7012
Dennis Overgaard Nielsen
Denmark |
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Reply: 23 - 35 |
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| jimnaylor |
| Posted on: August 29th, 2011, 20:49:38 |
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Big Member
Location: Bedfordshire
Posts: 222
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Attaching the seat to the roll cage is a very good idea and the roll centre were very keen that I did it. But to date I've never found a way to do it and still have any headroom! Suggestions welcome!
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Reply: 24 - 35 |
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| dalla |
| Posted on: August 30th, 2011, 18:24:15 |
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Medium Member
Location: Aarhus Denmark
Posts: 112
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Yeah i see the problem, i was thinking about a gurney bubble, but that might not be enough?
Do you know if a mod like this is accepted by FIA rules? |
Mini Marcos Mk.II 7012
Dennis Overgaard Nielsen
Denmark |
Last modified August 30th, 2011, 18:25:02 by dalla |
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Reply: 25 - 35 |
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| jimnaylor |
| Posted on: August 30th, 2011, 18:48:49 |
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Big Member
Location: Bedfordshire
Posts: 222
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Strictly speaking you need 50mm above the drivers helmet to the top of the roll cage, but I've never known a scrutineer check that. I certainly haven't got it, I think I might have about 5mm! I've had to pad the roof to stop scratching my helmet, I also only do UK events. But a Gurney Bubble rather shouts at the scrutineer that you have no clearance. There is at least one MM I've seen photo's of with a Gurney Bubble but I don't know if it's caused problems. Malcolm Anderson used to compete in a Clan with a wedge shaped raised roof section but the roll bar went into the highest part of wedge.
When the requirement to fit FIA seats came in, that created problems for me, as the cushion of all FIA seats that I looked at were at least 30mm higher than the seat I had been using. I considered raising the roof but dropped the floor under the seat instead a bit like a mk1 (mine is MK3). I droped it about 25mm which still left the floor higher than the sump guard plus it made the floor more rigid..... I far prefered my old Cobra Clubman seats though. |
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Reply: 26 - 35 |
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| Allan Brown |
| Posted on: August 30th, 2011, 19:39:35 |
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Administrator
Location: Billingshurst, UK
Posts: 452
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I have got a gurney bubble in my roof. My head doesn't go up into it but it does make it easier getting my helmet off in the car. I lowered the floor originally but found the driving position to low, making it hard to see the apex of the corners. So I put the floor back to normal and put the bubble in the roof.
I have sprinted and hillclimbed the car across the south of England for 10 years and have never had a scrutineer complain about it. |
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Reply: 27 - 35 |
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| admin |
| Posted on: August 31st, 2011, 09:27:52 |
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Administrator
Location: Maidenhead, UK
Posts: 2,383
Reputation: 1 (tot: 1) |
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| I hadn't come across the term Gurney Bubble before, but it seems it's yet another innovation of Dan Gurney to get his 6'3" frame into a GT40 which has a notoriously small cockpit. He also devised the Gurney Flap and (I didn't know this either) accidentally initiated the ritual spraying of Champagne around on the podium. |
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Reply: 28 - 35 |
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| Glenn_Merrigan |
| Posted on: August 31st, 2011, 18:34:42 |
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Baby Member
Posts: 30
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Reply: 29 - 35 |
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