Historical ignorance at Porsche Panorama

[James Davies]

Thanks for sharing that great photo Jon.

Yeah, interesting rubber tube velocity stacks.

The oil filler/breather is the same as used on the 356SL factory racers.

The fuel lines are off a 546 engine and spliced to fit the twin-barrel carbs.

[Albert Tiedemann]

Interesting
Bowdin tube for clutch and boot?

Not sure from the photo, but it looks like the clutch load is cantilevered 'way the hell over there on the threads of a clamp bolt.
You might get away with that for one race if you told the driver to use it in the pits only.

Clutch load to pinch bolt is not an issue as this is the same or nearly so in pull/push activation. The pinch bolt arrests position of the clutch shaft lever arm on the fork shaft and keeps the arm from falling off. Load transfer is at the serrations/knurls/splines of the fork shaft. The issue is the design of the mounting bracket for the slave cylinder as evidenced in both photos posted by Jon--especially the second photo as this looks like a "pit fix"[hexagonal member is bent]. Having only the benefit of the pictures, the spherical seat embodied in the arm that twists the fork shaft should be presented to the actuation shaft of the slave cylinder which should have a spherical form or connective piece at the interface. This should keep the load experienced throughout actuation most nearly "in line" and predictable in a force analysis. The bracket should use the three studs on the transmission housing as mounting points changing stud length as necessary. With three studs "working" in close proximity there should not be a need for escalation of stud size due to the close coupling. Since every gram seems to matter in race car design, steel and aluminum should be considered in the bracket design. I would design the bracket to limit deflection. I am sure that I could cut the necessary pieces out on a band saw and weld them up better than that shown in the pictures. BTW, the compression strut used in the 2nd picture is quite long and probably the reason for its diameter--or maybe that was what was lying around in the pits.