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Loading of the pulley.
If I recall correctly, the argument wasn't that the side loads (vertical when looking at the assembly on the engine) were too great. The problem was with the longitudinal forces imposed on the bearings of the Golf alternators. The Porsche fan apparently is capable of imposing some pretty substantial side loads in the form of thrust (in and out when looking at the assembly on the engine) which possibly could cause the Golf alternator to die prematurely.
The fan at speed is supplying enough volume to cool a high performance 6 cylinder air-cooled engine. One would only assume that it pulls the air into itself in order to force it over the cylinders. That pulling effect would be able to apply alot of force.
What do you gals/guys think?
To err is human, but if the eraser (rubber if you're English) wears out before the pencil, you're overdoing it.
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