Hello
The 912 had two different heating systems. One was the "Freshair" exchangers and the others where the export exchangers.
The Freshairversion uses fresh air and heat them up in the exchangers.
The Export version are just some flaps that guides the colling air from the cylinder fins into the cabin.
The last version do allways smell like hot air from an engine. The freshairversions are a that better as long there is no oil in them.
To check if you have monoxide in the cabin use a tester.
The two isolation pipes in the engine bay are for the rear screen defrosting ducts.
The hoses are AFIR 22mm iD and Porsche still sale them. Only the isolation is NLA but simple to replicate.
Holes in the kickpanel are for the fuelline, electric looms, speedo, shifter, cables. The usally have rubber gromets or boots.
Open holes will vent the cabin and let more noise in.
Grüsse
|