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Pictures speak louder ................... bearing in mind the severity of Irish bumps in the road , I decided some minor re-engineering of the junction between front chassis legs and the bulkhead were in order ..... note how the original design / manufacture does not join up the two parts "well" .............. obviously fine for normal road use , but ............. Original joint - nice strong rib vanishes Triangulation of joint (leaves a nice dirt trap) Final product - almost , now boxed in
isn't a good engineered roll cage from front to rear towers taken all that extra abuse ?
Ok, i understand in rally cars , they weld continuous beads instead of the oem spot welds.
Most "ordinary" roll cages do not go to shock towers - infact in Historic Stage rallying , they are outlawed (not allowed) . Ref spotwelds , I have taken the view NOT to seam weld my shell , due to the sheer quantity and quality of Porsche original spot welding
(PS seam welding would normally be in addition to the OEM spotwelding ..... but I guess that is what you meant - cheers)
now that is strange.... "not allowed" .
In a 928 it is that obvious to at least include the rear towers points.
I admit it is not easy to reach the front ones .
is a bridge allowed ?
now that is strange.... "not allowed" .
In a 928 it is that obvious to at least include the rear towers points.
I admit it is not easy to reach the front ones .
is a bridge allowed ?
Basically to stop people building "modern" historic rally cars - if it was done in period (and you can show that it was) - then it's ok. As nobody rallied a 928 in period - it's a non starter
Bridge ?? as in strut brace - is ok , but it has one anyway ..... steel would be stronger , but I don't see it as necessary. Look at rear design - rear shock towers are well supported in essence - by linking body shape.
we have a strut brace between the fenders... not the towers.
I welded extra supports from the 928MS brace to the towers sandwiched plates.
Could do that as i use Webers IDA48's .... don't know with oem inlet manifold.
Most "ordinary" roll cages do not go to shock towers - infact in Historic Stage rallying , they are outlawed (not allowed) . Ref spotwelds , I have taken the view NOT to seam weld my shell , due to the sheer quantity and quality of Porsche original spot welding
(PS seam welding would normally be in addition to the OEM spotwelding ..... but I guess that is what you meant - cheers)
Not to mention that the galvanizing makes welding a real bitch, which is probably why your re-enforcing welds look the way they do.
now that is strange.... "not allowed" .
In a 928 it is that obvious to at least include the rear towers points.
I admit it is not easy to reach the front ones .
is a bridge allowed ?
Not allowed..is generally a containment of costs, and in some classes, not wanting to cut up the car beyond what's reasonable.
But FWIW...i would use heavier steel, and larger gussets to spread the load to a longer area of the shell.
12-16-2021, 10:43 AM
Shell reinforcing mod - Rally car prep
