BGLeduc

Just guessing, but I would think that water ingestion would be a concern if it were pointed upward.

Brian

Earlydays

I suspect it is to get warmer air, when the engine is cold.....

Laker

^^^ This.
When you are moving, outside air flows over the roof, down the back window with some going into the louvres, pushing hot air surrounding the engine, down and out.

HiWind

Water - right, thanks .Could be but the 996 and later air boxes get air direct from louvre/ram air scoop
... But those air boxes might have a small drainage hole. Will check on mine to see.

Read on another thread that the air in the engine compartment is flushed every 1 or 2 secs at speed,
so I guess it doesn't really matter really

Gus

So it is not a water funnel / but I understand your question as it really would be nice to have the primary air intake just below the louvers - but not open to direct water.

HiWind

Thanks Gus - yes I mean rain water but ...

this is where you're going

Ie it doesn't seem to really make enough difference to power - I'm assuming the 10deg c = 1% HP gain that Adrian quotes - to just get some cooler air when air circ in bay is so high anyway. But that's just my estimated view. Maybe a couple drainage holes/pipe under the funnel would work. But per my link above, the real gain would be ram air scoop direction ala 996.

raoul

Just fitted a carbon rs intake pipe that replaces the stock one and sits pointing up and below the louvres to get the aforementioned cooler air. It has a drain hole. Bought from design911 in the UK. Don't expect much improvement but it does look nice

HiWind

there you go -- thanks Raoul - should get some real testing in the UK rain wise! l

raoul

Here's a pic

g60pops

^^^^^^^^^^^
looks very nice