This animation presents the front row of valves and the complex trains that actuate them. Cam rings, cam ring drives, pushrods, rocker arms, and valves are all animated. Color-coded text labels show what stroke (intake, compression, power, exhaust) is in progress in each cylinder, and flashes show when each cylinder fires. Intake valve trains are shown in green, exhausts in brown. Each valve train illuminates whenever it is "on the lobe".