Examples of Vs are V - twin, V4, V6, V8, V10, V12 and V16 Vacuum Servo: The clever use of the engine partial vacuum to assist in pressurising the
braking hydraulic system Valve: In engine parlance Valve is a device that opens and closes an air passage to
let in or
let out gasses Valve Bounce: A condition where the fast moving valve has exceeded its springs
ability to keep from bouncing up off its valve seat at high rpm.