Four-Stroke Engine
A four-stroke engine completes its cycle in four piston strokes: intake, compression, power and exhaust, over two crankshaft revolutions.
What is Four-Stroke Engine?
Almost all modern car engines work this way. Valves driven by camshafts control intake and exhaust. Both petrol and diesel engines use the four-stroke cycle. The cycle is often called the Otto cycle for petrol engines.
How it works
Each cylinder fires once every two revolutions, with the other strokes used for gas exchange.
Why it matters for your car
Correct valve timing is essential; a slipped belt or chain can damage the engine. Engine oil lubricates the parts separately from the fuel.
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