Air tubes Following on from Stephens recent post on the D57 thread........ The 998 board had a thread a while ago about air tubes, restrictors, etc. I understand the 999 has helmholtz resonators (posh name for a plate with a hole in me thinks) installed on the intake side primarilly to reduce induction/intake noise. Are they removable? If so, has anyone done this yet and does it make a difference, other than noise? Also does the 999 suffer with the fairing intake csa Vs inlet tract csa conflict discussed on the 998 (etc.) board? And finally! I have seen air tube covers available in cf, are there any replacement cf tubes on the market yet? |
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Casoli :sing: |
I've just spoken to the chaps at Casoli, they only make the covers, not the tubes themselves. |
air tubes these are avalable from Sebi moto http://www.sebimoto.com or from Ten kate in holland Tel.: 0031/529/483481 in carbon or Fg |
just to update this - QBCarbon now do the air-tubes aswell as the covers :devil: |
I've since seen the QB items, big money tho'. My understanding also is that the 999 air tubes deal with resonance noise reduction by having a smaller tube formed in the plastic at 90 deg to the air flow which creates a noise at a frequency that counteracts certain areas of the frequencies generated by the induction. It is possible to cap them off for more noise but I do not believe that it provides a tangible net gain in performance. I do not know if the QB items are larger in air flow terms than the originals. Again, given the high prices I have decided to leave mine alone for the time being, with the resonators intact. |
air tubes now also avalable at carbonworld -- http://www.carbonworld.de/oscommerce...roducts_id=340 or www.febur.it (just updated website) the items from carbonworld come with a fitting kit and extra coolant bottle. all for euro 499. cheap hobby this! [Edited on 8-12-2003 by nathanhu] |
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Further news on the airtubes I received my newly gasflowed heads last week and have made some interesting observations. Stock each 999S heads/inlet flow 123lps or 260cfm at 25" of water Each airtube flows 302cfm at 25" water. After having my heads gas flowed, there has been a 10% increase in theorical power for the bike. I was concerned that the standard airtubes would not provide sufficient flow so had them checked. Conclusion, the standard airtubes only pose a restriction on a bike with that produces more than 170hp. A problem for the 999RS04 with 189+hp but not for a streetbike. I understand a few of you may be looking to replace them, because they look so restrictive, but the reality is they are not, so save your money. |
interesting one that, carbonworld.de state an extra 4-8bhp with their tubes!! They don't say with what state of engine tune tho! |
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