QUOTE(empire23 @ Aug 7 2012, 08:07 PM)
Thanks for the pics!
Flow and CFD happen to be one of things I do for a living, that's why I'm quite interested in how it works, although my skill level is borderline retarded.
Given the Reynolds number of typical exhaust gas (composition tikamed with AGA-8) and the bend factor, I'm not sure how it would increase velocity via the swirl. I guess the velocity would increase from the restriction but the swirl would create more turbulence, sapping it of kinetic energy. But I guess I'm not qualified enough to give a final answer, given the shape of the thing.
Just dreaming of a good exhaust after my friends at CEEFC threw around the idea of a few of us quitting our jobs and building high performance Inconel manifolds and titanium exhausts.
The best way to create backpressure for a system without turbulence or disturbing the pulse or lamellar flow is with a venturi type of restriction. Preferably cast or machined rather than rough welded.
swirl bullet r act for those having too big pipe.. alot people upgrade too large pipe for small engine thus alot exhaust shop take easiest way by jus adding bullet rather tha change smaller diameter pipe. swirl bullet or louvered r totally nonsense..Flow and CFD happen to be one of things I do for a living, that's why I'm quite interested in how it works, although my skill level is borderline retarded.
Given the Reynolds number of typical exhaust gas (composition tikamed with AGA-8) and the bend factor, I'm not sure how it would increase velocity via the swirl. I guess the velocity would increase from the restriction but the swirl would create more turbulence, sapping it of kinetic energy. But I guess I'm not qualified enough to give a final answer, given the shape of the thing.
Just dreaming of a good exhaust after my friends at CEEFC threw around the idea of a few of us quitting our jobs and building high performance Inconel manifolds and titanium exhausts.
The best way to create backpressure for a system without turbulence or disturbing the pulse or lamellar flow is with a venturi type of restriction. Preferably cast or machined rather than rough welded.
velocity will increase for swirl bullet(for low rpm), same like d idea of swapping straight flow to sflow muffler