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Upgrading Cam Oil Line Fittings

Starting with the 1991 911 Turbo, Porsche upgraded the cam oil line fittings with one that restricts oil flow to the camshafts by nearly 50%. The newer Turbo adapter has a reduced center hole, facilitating a reduction in oil foaming. Oil foaming is caused when there is too much oil in the crankcase and it gets "whipped up" by the rapidly rotating internal parts.

To help identify if the adapter has been replaced on the engine, Porsche changed the design. The new adapter has a groove around the center to differentiate it from the older adapter when installed on an engine.

One additional benefit with this upgrade is an increase in oil pressure, with an average increase of 10 psi most noticeable and beneficial during idle with a fully heated engine. According to most reports and tests, the upgraded fittings will deliver the following benefits:

New version with groove

Decrease in oil flow to the cam housings which decreases oil foaming.
Decreased foaming allows the scavenge oil pump to transfer oil out of the case and into the storage tank much faster.
Less oil foaming will lead to less consumption of oil through the engine breather system.
10-20 psi increase in oil pressure at the main and rod bearings as well as at the piston squirters.

Having experienced oil pressure problems during the afternoon at Ahvenisto, we were 90% sure that this upgrade was now a "must do" project and got promoted to the top of the list. From our perspective, this must be one of the best and easiest upgrades we have done on the car. Not only does it increase much needed oil pressure, it also delivers better lubrication and flow where it is required the most.

Technical data by Steve Grosekemper

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