How An Internal Combustion Engine Works

An impressive (and very large at 5.7MB) animated GIF that illustrates how every part of an internal combustion engine works. It's more than just the basic 4-stroke cycle. There's an animation of a 4-cylinder 4-stroke engine operating, one that highlights the fuel injectors, one showing air flow, one for oil, one for the spark plugs, and one that puts it all together with cooling and exhaust systems. Then for dessert there's one illustrating the three states of a hybrid vehicle: regenerative braking, electric motor drive/assist, and automatic start/shutoff.