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In a message dated 4/30/2005 8:07:43 PM Pacific Standard Time, ceengland@bellsouth.net writes:
Kent Paser of 'Speed with Economy' fame played with 'reversion cones' on
his Lyc. They are cones smaller in diameter than the exhaust ports &
mounted directly in the ports. Obviously this should interfere with
exhaust flow but he found that they can improve breathing in a Lyc.
Charlie,
There is more to the inversion cone exhaust than a restriction. I have talked to the guy that has at least tried to patent them. Jim Fueling. He did a lot of Land Speed record stuff. He was badly hurt in a Bonneville accident some time ago. The inversion cone uses a very minor taper to just under the standard exhaust diameter, that then dumps into an expansion area where the surrounding pipe is about a 1/3 bigger. (but still sealed) The pipe looks like a snake that swallowed an egg! The cones were usually placed about 8-10 inches from the exhaust port. I believe Fueling actually called them anti-reversion cones. The idea was that the sonic shock wave would be focused in the remaining tailpipe, while the expansion area would trap and break up any reflected wave. Some engines were helped by this others weren't. I believe he has a website. I always thought the rotary would benefit from the cones. I even mentioned it on the "other" site.
Bill Jepson
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