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In message <01bd21f6$fad3d520$1392728d@rosebud> "Matt Howe" writes:
> Under this line of thinking, wouldn't it make
> sense that a large air intake which tapers through ducting and finally
> arrives at your intake manifold, be more dense due to the increased
> pressure, and therefore provide better combustion? I may be totally
> misguided in this, but I would like to find out. This thread has been
This effect is used on the BTCC A4.
However - it requires forward motion, so it's no use off the stop-light line.
Also, the effect is comparatively small - you're relying on the inertia of the
air gathered by your intake horn. Air is light - not much inertia. The horn
doesn't need to be very big - you're only going to achieve a few percent
compression and so it only needs to be a few percent bigger than the rest of
the air path. And it presents resistant to the vehicle's path through the air.
Committee Member, UK Audi [ur-]quattro Owners Club