SwayBar

Clearly the ozone being ingested into the engine is the root-cause for the observed cylinder head corrosion.
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Who woulda thunk?

drooman

Porsche engineers think of everything. They knew that those intake ports above the radiator, attached to that cylindrical plastic tunnel, would lead mice up to that wonderfully delicious air filter, and provide the perfect home to store nuts and hide out. Since most 928 owners of the period didn't even know what an air filter was, much less think to check it or change it, Porsche knew that this condition and the associated damage could go unchecked for a considerable period of time. The obvious solution was to capture and kill the mice while they were in a panic-stricken and hasty exit from the airbox after the engine starts. By the time the mice get near the opening they are exhausted and disoriented from the engine noise and fighting the significant headwind of intake airflow. A perfect place to have a trap door for the mice, through which they fall directly into the rapidly rotating machinery in a wood-chipper style execution.

linderpat

You win the internet today Drooman!

GregBBRD

That's fantastic!

Jerry Feather

Sheesh! I think the supercharger effect is a lot better than the mouse trap theory.

808c2s

Tony

Thom

Was the hole in the belts cover plugged on the later 16V 4 cyl engines (944 S/S2 and 968) because the rotor prevents, by its flat design, ozone to make its way to the belts?
If yes then why where the holes not deleted on the 32V 928 engines which use the same rotor?

Billu

I thought it was to suck the oil fumes from leaking cam seals, crank seals, oil pump seals past the water pump to provide pump shaft lubrication.

Snark Shark

Actually it pumps oil fumes into the cabin to give it that wonderful oily smell that every grease monkey enjoys.