924Srr27l ....I used to have an aluminium for show strut brace which I knew would do nothing for Racing so a Steel brace was made....
John Sims924Srr27lA strut brace works in tension so you probably added weight unnecessarily.
944 manAs usual, Rodger has confused his own half-arsed opinion with fact. Rodger posting nonsense has become the PCGB 944 forum's thing, it would seem. It would take the mixture of a little research and a bit of humility (ie, not thinking that you know it all Roger, if that helps you?), to establish that the 924 was developed using the lessons learned from Porsche's safety project from the early seventies, and that as a result of this, the car is extremely strong/durable/safe.
924Srr27l So overall it's ... so much stiffer R
John Sims924Srr27lSo overall it's ... so much stifferRNot as a result of that cage it isn't. 4 or 6 point mounting for Club racing is specified in the regs in order to reduce any additional torsional rigidity that the cage might introduce. This is to avoid any such additional advantage of a multi point welded in cage. The Blue Book specifies cage design to protect the occupant without contributing to dynamic rigidity.It goes back to the days when people were pretty much creating internal space frames out of the cages and regs were revised to avoid this offset in advantage for Club series.I would also be concerned over your seat belt mounting. A friend of mine almost died in a crash a Snetterton when the belts crushed the seat back allowing him to become loose in the car.
924Srr27lSo overall it's ... so much stifferR
924Srr27l The seat, belts and their mounting positons etc...are all totally to FIA / MSa specs as passed by FIA Scrutineers
John Sims924Srr27l The seat, belts and their mounting positons etc...are all totally to FIA / MSa specs as passed by FIA ScrutineersAnd so was his, and had passed scrutineering at a great many more than three events. It still broke the seat back and he still almost died.I agree a strut brace will add rigidity, I wasn't querying that.My point was a six point cage of that type is deliberately designed not to. RFM.The additional low rear horizontal bar adds triangulation, and would be illegal in some series, but as it is only relative to the tops of the rear dampers this would have little impact on a 924. It is pretty much just adding weight in this instance.
924Srr27l Motorsport Safety and technical training has been my day job ! Not just on cages and extinguishers but also racewear and helmets etc..
John Sims924Srr27l Motorsport Safety and technical training has been my day job ! Not just on cages and extinguishers but also racewear and helmets etc..Well that is a surprisingly wide spectrum of specialisms. In what capacity were you consulted on these diverse fields of expertise?
vitesse.....As far as I can deduce,adding a great stiff beam across the cars front end just moves the deformation possibilities further along the chassis rails-deformable front ends are meant to protect not only occupants but minimise chassis rail expensive repairs .
vitesseSurely anti-roll bars are meant to stiffen the reaction of the 2 connected wheels to roll-no bar=each wheel does its own thing-a bar produces reaction from one wheel to the other via the wishbones /trailing arms.As far as I can deduce,adding a great stiff beam across the cars front end just moves the deformation possibilities further along the chassis rails-deformable front ends are meant to protect not only occupants but minimise chassis rail expensive repairs .
graham.webb On the other hand, I seem to recall that on the le Mans cars, as well as a strut brace there were diagonal braces back to to bulkhead centre? Maybe without that it's a waste of time?!!
vitesse As far as I can deduce,adding a great stiff beam across the cars front end just moves the deformation possibilities further along the chassis rails-deformable front ends are meant to protect not only occupants but minimise chassis rail expensive repairs .
924Srr27l968, what's left of it ! R
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