[Diy_efi] EGR and Valve phasing/lift

[Tlsalt at aol.com]

Perry Harrington wrote,

What I was thinking was making a custom head with 2 cylinders
in the exhaust and intake tracts that rotate to allow gases through.  You
essentially have a cylinder big enough to flow the full intake/exhaust flow
when turned to 90 degrees, but blocks off the flow and seals the combustion
chamber when at 0 degrees.  

Hello Perry,

This idea is very similar to the Cross rotary valve engines from the 1930's.  
They used a single rotary valve (your cylinder), on top of the combustion 
chamber, perpendicular to the bore axis. One end of the valve (cylinder) 
connected to intake, the other side connected to exhaust through a window in 
the top of the combustion chamber.  In other words, the intake and exhaust 
ports were in the center of the spinning rotary valve (at a half crank 
speed).  It was good for 195 psi bmep on 66 octane fuel, but sealing the 
spinning valve was the problem. Also where to put the spark plug ?  There are 
also rotating combustion chamber designs that have windows that align with 
the ports,but sealing, lubrication and friction are the issues. Yamaha also 
used a rotating valve to change the dimension of the exhaust port on their 
last two stroke road bike.

Paul Saltwick

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