The pipe inserts in 312B's rear wing

[jareddorcy29]

1. What is the purpose of this pipe? I think pipes that transport the engine oil is very thick, black and near the top of the engine.
2. Why does it have to pass through the rear wing? I think it is troublesome to drill on the aero components.
If you feel the below picture so small, please right-click to open it in another web page so that you can watch the clear photos.

[AR3-GP]

Maybe wing was being used as a fluid storage tank.

[Just_a_fan]

The triangular section between the wing and roll hoop appears to be a header/expansion tank for the cooling system. Strange design, thogh.

[SiLo]

Is there a small radiator hanging off the rear at the back?

[Farnborough]

There's a lot going on there

"Shark fin" i think is structural and fully welded as part of roll hoop structure. Wings, 2 of, are bolted either side of this fin. Flat 12 engine, in comparison to V block has torsional rigidity compromise in ultimate load it can take. Really twisting it from chassis loading pinches crank bearings, potentially.

Pipes travelling inside that are in chassis effectively.

Tank behind driver looks to be coolant header, and pretty normal for period.

Oil tank for dry sump was usually at rearmost of cars (end of gearbox) to facilitate all oil being there under acceleration load etc.
Mistery pipes through shark fin LOOK like vents from crankcase and head voids to vent any excess oil/air back into the oil feed tank to maintain oil volume (rather than just blow it out to atmosphere) in system if the engine gets a bit "windy" during race weekend. Quite normal to do that and not essentially pressurised as such.

The oil tank will usually incorporate some means of de-airation of content to feed only oil/liquid down to oil pumps and not cause cavitation, which will completely toast the bearings at high load.

That oil tank was often a vertical column type to facilitate the above.

Often an oil cooler was fitted near there, either for engine or transmission cooling.

[Hoffman900]

Should be the coolant expansion tank vent. If it burps some, you want it discharge out the back and not where it can get on the rear tires.

[Farnborough]

In the first picture, you can see the pipe that enters chassis is attached to a spigot entry down beside the coolant header tank, possibly a flame trap that would be usually in place on oil venting.

They then appear to exit the rear of structure, looping down behind Texaco logo, then coming up again to attach to component thats possibly part of the oil dry sump system.

The coolant header has its own vent exiting from just underneath the cap (post pressure control mitigation in that cap) then running directly downward from there in different/smaller bore than the other two pipes.

Looks like crankcase venting with those two larger bore pipe, likely one for each bank.