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OK. I'm about done digesting, so...
This is completely logical, under the theory that the sharp edge will trip the exiting airflow into turbulence. Clean air always flows faster. I keep thinking about the exhaust inserts. Ed has the opinion that they must be eating up horses to give the noise reduction by causing back pressure. But what if the inserts work like a fowler flaps and just helps the gas to exit is an orderly manner vs all turbulated? Aren't laminar flow aircraft typically quieter than turbulent flow ones?
Has anyone compared the noise produced before and after an exhaust has been radiused?
Has anyone attempted to 'shape' the inserts so that it has a radiused leading edge and a tapered trailing edge (ie, aerodynamic)? I know they're not very thick, but their thickness is a significant portion of the overal exhaust ports size.
-- The Mazda data shows a 8 db decrease in noise energy using the splitters, since this is probably "lost" energy in the first place - being exhaust energy, I am certain that the power is not down by 8 db {:>). However, others, including Bruce T have suggested that they cost approx 15HP at higher rpms (RPM not specified). I have not seen any dyno data that would provide enlightment on this question. Lynn do you folks race with exhaust splitters?
Ed
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