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pbrown. If you get a lot of dust then you should take off the four (6?) or so philips screws and examine the foam filters in the flap box over the inside of the rear window. We don't get much dust in the Isle of Man but mine were blocked solid. You can wash them (carefully). A 2000 4.6 Holland and Holland.
ps what about taking the schnorkel through the pollen filter housing? OK in a hot country but in the Isle of Man, in the winter, I would like the heater to warm me not the engine.
Goingbush is on the money! There was an engineering study done using (IIRC) and Audi quattro. The developers placed pitot pressure sensors at various positions on the front of the car to record pressure buildup to determine aerodynamic drag.
At high revs in intermediate gears, there was virtually no pressure! All available air was being consumed by the engine air intakes which were placed each side of the front grill... :twisted:
I've often thought of piping the air in from the cabin - who cares about the noise, and if you opened the sun roof all the way there'd be no cabin vacum. I had plans to do this on my classic, and cut the hole in the passenger side pedal box.
There is room on the p38's to join a pipe to the front of the airbox, and run it next to the eas stuff, over the top of the shock mount. Would be easy to block off with large plastic ball valves operated by a choke cable setup.
Could it possible be plumbed in to where the steering column is on the LHD models? - lazy of me I know - but cars in the shed and it's dark and scarry in there.
I don't know wether it'd pop your eyes out, as the cross section for the pollen filters in larger than the intake diameter of the motor - but it sure wouldn't be comfortable. I certainly wouldn't want anyone with bowel problems in the car....