Join Date: Dec 2014
Location: Toronto, Canada
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Re the holes in the air intake tube:
1. They won't significantly affect ram-air pressure. At high wind speed, there is more air volume trying to be rammed into the single ram-air inlet than the engine can draw in. A little bit of overflowing through those holes won't matter. Do the following experiment: Take a paper cup, poke a hole a few millimeters diameter in the bottom of it, hold it in a stream of water from a faucet so that the cup is overflowing by 2 or 3 times as much water as is going out the hole in the bottom. Now poke a pinhole in the side of it. What happens? A bit of water comes out the pinhole, a bit less overflows, what comes out the bottom stays the same.
2. They provide an alternate air intake path in the event that the front ram-air inlet gets blocked (e.g. you strike a wayward plastic bag or some such thing while riding.)
It's entirely possible that there is some other more esoteric purpose to them ... acoustic/noise control, damping out some critical resonance frequency, etc.