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Read this before you hack your ram air tubes!

1713 Views 4 Replies 3 Participants Last post by  Tiamat
not exactly a 7R, but it's the same principle.

Taken from 's 1999 cbr f4 review:

On the intake side of the engine, the F4 now has a for-real ram-air system that features weird looking polyps just inside of each ram-air opening. Other bikes have these things also, such as the Kawasaki ZX6-R and if you've been wondering why they're there, it's to help reduce the chances of improper mixture when a rider goes full-on throttle at low speeds.Without the bike moving forward to create pressure inside the airbox, a hard twist of the
throttle at low speeds can momentarily use up all of the air within the box. The intake sacs provide a greater volume of air within the bike to keep the engine from over-richening under those conditions. They're sort of like having a third lung.
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I've taken mine off my 6R and notice a top end improvement and grunt. Bottom end seems unaffected.
I'd have to argue with that reason for having resonators attached to the ram air tubes. Ever see a race bike with those on? No - that's because they have nothing to do with intake air volume. They are exactly what they're called - resonators. Depending on who you talk to, they're either there to reduce intake noise, or make it louder. Technically, both could be true, as all the resonator will do is enhance or negate sounds at certain frequencies. I seem to remember some Kawasaki press release mentioning something about tuning the intake frequency to help with combustion, but I find that hard to believe as well.
I'd also like to add that this is all speculation on my part. I don't think anyone but the Kawasaki engineers know exactly what those things are really for.
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