Rotary valves enjoy the benefits of an actual (spindle) bearing instead of a simple sliding surface. Except for lubrication of the bearing, rotary valves do not need the frequent lubrication which is common with piston valves. However, unlike piston valves, the surface of most rotary valves is naked brass. In an environment rich in carbon dioxide, moisture, and electrolytes (breath aerosols), the brass valves undergo constant attack. The formation of copper and zinc carbonates - as evidenced by the blue and green color - can becomes so severe that dezincification and carbonate buildup eventually cause the valves to be immovable or destroyed altogether.
60' ~ 2.1, 1/8 ~ 9.61 @ 73.4mph
Living one day at a time!
DAMN Those are some old *** numbers!!! I need updated ones!!