kurbycar32
Parking Attendant
Posts: 2
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posted June 30, 2005 08:12 AM
Exhaust help. There has to be somthing wrong with this
I just thought this up the other day and i hear that this is the place to talk to some exhaust professionals. I am by no means an expert but it made sence to me. heres the thread link i have already started on another forum (i dont have a ZX-10)
http://www.bayarearidersforum.com/forums/showthread.php?s=&threadid=125777
  
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k bryant
Needs a job
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Posts: 2911
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posted June 30, 2005 10:39 AM
As "wannabe" pointed out to you on that site, exhaust design much more complicated than simply increasing flow. It would be somewhat redundant to repeat much of what was already said on your thread. There are other principals to add to it, but suffice to say, it is reasonably accurate and points you in the right direction.
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kurbycar32
Parking Attendant
Posts: 2
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posted June 30, 2005 12:04 PM
the idea is to make the pipe as flat as possible, i thught more smaller pipes laid along side eachother would do it. i am told that you are the ultimate exhaust guru, can you point me in the right direction to where i can learn this stuff? books? i think flat exhaust would be way cool
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k bryant
Needs a job
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Posts: 2911
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posted June 30, 2005 06:44 PM
Tell me exactly what you are trying to accomplish, on what bike, and I'll try to help you out.
My knowledge comes from over 30 years of experience in the exhaust field. Trail, error, thousands and thousands of dyno and flow bench hours, along with countless prototypes, countless test sessions at the track, etc.. Being a racer myself and working with some of the best racers and race teams from all over the world helped with the base foundation. And probably most importantly, working with and listening to some of the top engine builders, tuners, engineers, designers and fabricators in the business. Listening to all input and theory and not discrediting anyone's opinion/design unless verified as fact. From there, you start coming to your own conclusions and theorys and make your own path as to what you think is the right way to design an exhaust to meet a particular performance goal, on a particular engine, in a particular state of tune.
The best advice I can give is first understand engines. Get some books on that. Cam timing, valve sizes, bore/stroke, rpm ceilings, combustion chambers, port tracts, etc. Then get some on the intake side of things and understand carbs, fuel injection, vena-contracta, etc. Then cover some on exhaust theory; wave tuning, tapers, collectors, lenght/diameters, back-pressure, etc. Most any of them will do to get you started. So much of it is trial and error. Sure, you have a basic baseline to begin with. From there, most will come from the dyno, flowbench and/or rider. But again, it depends on exactly what your goals are on what you are trying to accomplish. Sometimes it's give and take to get what you want to attain. You can be restricted from being completely creative by design limitations based on fitment and/or sound. Sometimes on the dyno, we worry about fitment last. We'll get the power and/or powerband we are looking for, then make adjustments to actually get it to fit on the bike with the body work back on.
Many times it's not just about the exhaust being designed properly. It's the whole package. In seeking the best performance, without limitations, we'll alter cam timing, ignition curve, compression, intake systems, and of course fuel mapping and/or jetting. But again, they're are really an almost infinet number of variables. Altitude, humidity, gear box ratio, tire height change, fuel change, etc, etc, can make the best designed exhaust on the dyno, fall short and fail to meet the ultimate goal. Again, everything is normally made up of compromises.
One day I would like to write a book. Until then, my opinion is one of many.
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