Coates Spherical Rotary Valve Cylinderhead

[Mean Green z28]

Found this ...

my thoughts --> looks pretty interesting and is a very unique idea. Since there is not cam per say, upgrading would involve changing out the whole twin cam assembly but! ... NO worries about cam springs/etc. anymore and some crazy lift numbers/lobes (well, comparatively) are def. possible.

LINK! ... http://www.coatesengine.com/csrv.html

From one of their Press releases ...

"Where the CSRV really shines is in its airflow potential compared to a poppet valve Bench-marking a 5.0 L engine from a Lincoln, the stock Ford casting (when tested at 28 inches of H2O) flowed approximately 180 cfm on the intake port at static. The rotary valve for the engine in comparison flowed a whopping 319-cfm at the same test pressure. Equipped with the poppet valve head, the Lincoln engine dynoed at 260 hp and 249 lb.-ft of torque. When equipped with the CSRV head at the same 5,500 rpm test protocol, it made 475 hp and 454 lb.-ft of torque, with no changes to the block or rotating assembly: The higher power was a result of diminished frictional and pumping losses, but the inherent airflow benefit of the spherical valve was the major contributor. With a conventional poppet valve, it can take 34 degrees of crankshaft rotation or more to reach a fully open position, wasting energy and limiting volumetric efficiency. With the CSRV, a comparable port area is exposed in only 2 degrees of crank rotation. The CSRV allows for superior surface flow coefficients from its spherical shape. With the standard 4-inch Ford bore, the factory poppet valve covers only 15.8 percent of the total bore area, while the rotary valve is measured at 20.5 percent"

NOW THIS IS AWESOME !!!

Edited September 19, 2006 by Mean Green z28