page = bartosz ciechanowski
url = https://ciechanow.ski
Since the piston moves down twice and up twice, it does a total of four strokes and the engine we’ve built is known as a four-stroke engine . Notice that it takes two revolutions of the crankshaft for the piston to do one full cycle of the work as it goes through the four phases: intake, compression, power, and exhaust.
Most modern engines use two camshafts , one for intake valves and another for exhaust valves . Let’s see how the camshafts open and close valves during a typical engine operation: