flyrotary@lancaironline.net Mailing List Archive

Ben, I must remind the group you are using a Renesis engine. information on intake lenghts for the RX-7 probably are't applicable to the Renesis. It is my understanding that the RX-7 intake uses a pulse coming out of the intake valve created by the overlap of the exhaust and intake valves on the rotors. The overlap has been eliminated on the Renesis and a seal incorporated on the side of the rotor to cut-off any exhaust flow into the intake opening. When I designed my new intake I adjusted the intake tube lengths so that when the flow into rotor #1 is stopped by the closing of the valve the reflected wave or pulse would travel to rotor #2's intake and arrive near the end of the intake cycle. I have seen better take-off performance and improved high altitude performance. The higher horsepower has exacerbated my marginal oil cooling!! Attached is a picture of my intake. Dennis H. P.S. I probably will not make Oskhosh this year. I went last year and enjoyed it but my tennis team plays in the Texas Sectionals in Dallas during Oskhosh. Ben Schneider wrote: Fellows, I have been thinking up this crazy idea of trying to make intake runner tubes out of carbon fiber. My question is regarding length of the velocity stack. Does the length make a difference? Could a velocity stack be more or less the entire length of the tube? Meaning, if I have a 12" intake tube, could the entire length of the tube be a gradual taper to the diameter of the block opening? Would that mess with the speed the air is traveling in the tube? Aerodynamics is not something I have a very good handle on, and am hoping someone out there in Fly Rotary land can shed some light. Toughts??? BTW, Any reasons why carbon fiber should not be used for intake tubes? May make the velocity tubes a mute point. Thanks for any thoughts. Ben Schneider P.S. Any Fly Rotary fellows going to OSH??? Perhaps a lunch one day or something. -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html

100_2456 (Small).JPG