Roger
Club Member
S&S claim their new reed valve for Evolution engines increases air flow and allows Evolution style engines to breathe more easily.
Designed to work on crankcase pressure rather than timing, the reed valve is an upgraded replacement. . It has three steel reeds that open on the downstroke of the piston, allowing improved cam chest venting. When the piston changes direction, the vacuum closes the reeds, preventing air from entering the crankcase and maintaining pressure, thus improving scavenging.
Designed to work on crankcase pressure rather than timing, the reed valve is an upgraded replacement. . It has three steel reeds that open on the downstroke of the piston, allowing improved cam chest venting. When the piston changes direction, the vacuum closes the reeds, preventing air from entering the crankcase and maintaining pressure, thus improving scavenging.
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