Aluminium front cross member. First year?1973?

[911MRP]

Curious that 1972-74 Porsche would have gone from forged aluminium crossmember on the original ~1000 homologation RS/R then switch to regular series-production steel version somewhere around chassis 1100s then switch again but to cast a aluminium version for some in 74 then back to a series- production steel version (if I understand this chronology correctly)?

Or was the cast version in September 73 for the MY 74 Carrera vs steel version on the other 74 911 models?

[sithot]

Part Numbers:

911 341 013 05 911/911S Carrera 2.7 Steel

911 341 013 10 911/911S Carrera 3.0 Aluminum


http://forums.pelicanparts.com/porsc...ml#post1296254
"The 1974 911 and 911S were equipped with the steel front axle beam; the factory parts catalog shows the US 1975-1977 could be equipped with either the steel or aluminum alloy front axle beam. See the below figure. Item 4 is the protection plate (splash pan); PN 911.341.161.02. Item 5 is the screw you are inquiring about; it is a M10 x 25mm long socket head cap (Allen head type) screw (strength class isn't given but I concur that a class 10.9 or 12.9 should be used); PN 900.067.022.02. Item 6 is a 10 mm spring washer (wave type); PN 900.142.005.01. Item 7 is a 10mm (10.5 mm ID) flat washer; PN 900.025.008.02. Cheers, Jim"

[chris_seven]

Curious that 1972-74 Porsche would have gone from forged aluminium crossmember on the original ~1000 homologation RS/R then switch to regular series-production steel version somewhere around chassis 1100s then switch again but to cast a aluminium version for some in 74 then back to a series- production steel version (if I understand this chronology correctly)?

Or was the cast version in September 73 for the MY 74 Carrera vs steel version on the other 74 911 models?

I do agree and looking at the SC part I am surprised it is cast as the finish is very good.



The reinforcing plates described as Tunnel Strengthening also connect to the torsion bar tube.

We have been making them for a few years.

We now make them in Tenform XK450 HSLA steel and form them to the correct shape.







We have quite a few in stock