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Message: <blockquote data-quote="DanzEterna" data-source="post: 1064445537" data-attributes="member: 57656">haha sorry bro i was not a fan of centre bullets, but if not mistaken this has been discussed before couple of yrs ago need to dig out the threads. will try to find out more for u.---------- Post added at 03:03 PM ---------- 6 hour anti-bump limit - Previous post was at 03:00 PM ----------perhaps it makes the exhaust gas exits the muffler faster? kinda like a tornado style?---------- Post added at 03:05 PM ---------- 6 hour anti-bump limit - Previous post was at 03:03 PM ----------u could try reading this, using same method kua..http://naca.central.cranfield.ac.uk/reports/arc/cp/0130.pdf---------- Post added at 03:16 PM ---------- 6 hour anti-bump limit - Previous post was at 03:05 PM ----------found on google..Swirling Bullet Center Box by OmegaPart of the reason of the loudness / scream like F1 is suspected from the center bullet box. I call it a swirling bullet. Sorry to picture. The swirling bullet is just a term I made up, don't know the official tech term. It's simply a mid-box silencer kind of thing, but the internal is a swirling shaped perforated tube with fibers inside the walls. Imagine a torque screw kind a look.Personally I think (from my studies of acoustics) that the physical swirling is only cosmetics and does not do anything to improve performance. In fact the difference between air-speed on the swirl and in center flow is so great that a high pitched scream may be generated. Since the air-speed difference is so great between the swirl wall and center flow, in reality we "assume" that the true air-flow is only the center section without the swirl. i.e. smaller diameter pipe.Some times I think if the scream I predict is true that means sound energy is produced and this energy must come from some where and is not free, hence I may have lost some engine power Don't know may be I think too much. Well, I may be thinking too simple previously. Because that swirling shape, where it's number of turns per distance over xx amount of trunking in (mm) is a function of wavelength which is frequency which is engine rpm.There is also the issue of steady state air flow versus variable and not to mention the engine valves overlap backwards into the throttles and backwards into the air filter. As this matola muffler is only at it's loudest with full throttle 50% to full throttle.Oh, well, just ignore me.</blockquote>

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