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Air is used in a number of ways in engines. First, air is used in some engines as the engine coolant as opposed to water. Air cooling systems make the engine lighter but are not as effective as water cooling systems in keeping the engine cool. Outside of air cooling systems, air circulation through an engine is important part of performance. Air flows through an air fir filter to clean the air before it is then passed through the intake manifold which mixes the air with fuel. This air-fuel mixture is then pushed directly into the cylinders where the mixture is burned. Lastly, diesel engines require a compressed air starter system as opposed to a typical gas engine ignition system due to the very high compression ratio that is essential in diesel engines. Compressed air is used to force the piston downwards allowing for the air to flow into the other cylinders which provides the initial rotation required to start large diesel engines.