M series roll cage

[madsvlund]

As I'm in the process of planning the roll cage build for my M, do I remember to have seen a very well build M series roll cage on the www, but can't find it.

The main structure and the front window supports are straight forward, but the door tube is a bit of a headache. I could cut the cabin and door to "hide" the tube there, but will require the window handle to be moved and will be irreversible damage to the doors. So perhaps there is another way ?

[griff 200]

Andy robinson race cars has good pics on his web site I used his rear on mine but not using full cage but I may be changing my mind?? Found a good well tucked in A post bar on a tvr Cerb roll frame. Richard

[griff 200]

I'm fitting a front hoop just under dash etc but will be adding threaded tubes to A and B posts and have door bars that unbolt so can remove or fit depending on the use!!! Or is this a cop out?

[griff 200]

[anonymous-user]

griff 200 said:

Andy robinson race cars has good pics on his web site I used his rear on mine but not using full cage but I may be changing my mind?? Found a good well tucked in A post bar on a tvr Cerb roll frame. Richard

Beware if you're considering racing, the type of cage illustrated here would not be allowed.

[madsvlund]

I think this is based on american rules, they are a bit different to FIM appendix K. But I need to discuss with the local FIM guy, as appendix K recon that old GT cars with backbone tubular fram can be difficult and can be exemptet from some of the normal requirements

[anonymous-user]

madsvlund said:

I think this is based on american rules, they are a bit different to FIM appendix K. But I need to discuss with the local FIM guy, as appendix K recon that old GT cars with backbone tubular fram can be difficult and can be exemptet from some of the normal requirements

I was basing it on MSA Blue book (UK regs). It does however make sense when you consider how easily the cage would fold as a result of the additional bend to get around the dash. One bend is all that is allowed for MSA regs.

Door bars.. how high, how low, side impact vs egress in case of fire. Mine is low.

[Fiscracer]

If you are thinking about racing, you should be aware that the FIA have changed the rules for this year.

Andy Robinson is good, you could also look at Caged in Frome I think and Rollcentre.

R

[madsvlund]

TVRMs said:

madsvlund said:

I think this is based on american rules, they are a bit different to FIM appendix K. But I need to discuss with the local FIM guy, as appendix K recon that old GT cars with backbone tubular fram can be difficult and can be exemptet from some of the normal requirements

I was basing it on MSA Blue book (UK regs). It does however make sense when you consider how easily the cage would fold as a result of the additional bend to get around the dash. One bend is all that is allowed for MSA regs.

Door bars.. how high, how low, side impact vs egress in case of fire. Mine is low.

Do you have more pics of your cage ? rear part of doortube ? and what seat do you use ?

I was thinking of a sparco Sprint V as the most narrow base one I can find.

Br Mads

[anonymous-user]

Sorry Mavs, still not got the pics you need of the cage. Car remains in semi-component form with current task being to get the engine to make the power it should. I hate engine dynos lack of ability to be flattering (as in, you can't invent transmission losses to convince yourself you have amazing power...).

Seat is a Cobra FIA historic and it is very narrow, both at the base and at the shoulder, I searched several car seat manufacturers’ stands at various auto shows equipped with a tape measure before I found it. I needed an FIA stamped seat as well so I had a narrower market than you maybe have. Good quality though.

[madsvlund]

I got the tubing yeaserday, ø38x2,5 and ø45x2.5 as stated by FIA, today did I go to the machine workshop and made a lot of conical couplings and other bit's and pieces. The bad news is that the toolshop didn't have the tubebender in stock, but then it's of to another shop tomorrow.

For the seats did I buy a set of Sparco sprint V, even the Cobra FIA classic look stunning. But the Sparco sis slightly bigger and 1/3 of the price

Pictures will follow shortly

[anonymous-user]

madsvlund said:

I got the tubing yeaserday, ø38x2,5 and ø45x2.5 as stated by FIA, today did I go to the machine workshop and made a lot of conical couplings and other bit's and pieces. The bad news is that the toolshop didn't have the tubebender in stock, but then it's of to another shop tomorrow.

For the seats did I buy a set of Sparco sprint V, even the Cobra FIA classic look stunning. But the Sparco sis slightly bigger and 1/3 of the price

Pictures will follow shortly

The cost bit will be mostly down to the FIA marking/approval - which I need for racing in Europe.

[madsvlund]

Fia marking of the roll cage ? In that case, the cost here (in denmark) is around 150£/300$ for a approval that your car is complieant to FIA regulation 253 or the relevant appendix J&K

For the seat/harness/helmet/suit etc. it will be checked at the individual races

[anonymous-user]

madsvlund said:

Fia marking of the roll cage ? In that case, the cost here (in denmark) is around 150£/300$ for a approval that your car is complieant to FIA regulation 253 or the relevant appendix J&K

For the seat/harness/helmet/suit etc. it will be checked at the individual races

My comment was in relation to the seat.

[griffer500]

Hi Mads

I'm highly interested in your roll cage because I want to fit also a cage in my 3000M. Besides mine Griffith 500 I’m building up a 3000M for Dutch road and rally use. A FIA approval is not necessary for me.
My biggest concern is the design and the dimensional drawing of the cage, how do you manage that? Do you have a design made in Solid works? From what I have seen from you, your skills are excellent so the results will a nice and clean cage.

[Slow M]

griffer500 said:

Hi Mads

I'm highly interested in your roll cage because I want to fit also a cage in my 3000M. Besides mine Griffith 500 I’m building up a 3000M for Dutch road and rally use. A FIA approval is not necessary for me.
My biggest concern is the design and the dimensional drawing of the cage, how do you manage that? Do you have a design made in Solid works? From what I have seen from you, your skills are excellent so the results will a nice and clean cage.

If you go this way, I have worked up a (mostly finished) AutoCAD 3D drawing of the M frame, that may help you. Let me know. Be awate that early and late frames have some differences.

Best,
B.

[madsvlund]

I'll post my drawings ones completed. Main rollbar is quite easy, the main headacke is the door bars and how to get them cleanly throu the instrument casting

Pictures will come

[maicoh]

Hello Mads,
I have the Sparco v seats in my M and they are very tight.I am short 5'7 an I drive with the seat all the way back.The problem is the sholder parts hit the door edge.I had to raise them about 1.5in.I wish I could post some photos but either it won't work for me or i'm to daff to figure it out. Might want to put in the rollcage first.
Good Luck

[madsvlund]

I know the shoulder issue, but Sparco is the most narrow FIA approved seat I could find. I'm 5´9 so quite close. My plan is to fit the main part of the roll cage, then loosely fit the seats, and then solve the difficult part with the door bar.

[griffer500]

@Bernard and Mads.

That would be very kind! All your information is very welcome.