As a kid I was always told: Suck-Squeeze-Bang-Blow!
Induction, Compression, Expansion (or Ignition), Exhaust
In a two-stroke engine, two strokes is one cycle. In a four stroke engine, four strokes is one complete cycle. A stroke is a part of a cycle. Remember that the "up" motion and the "down" motion each count as one stroke.
A 2 stroke fires each cylinder, every revolution. In comparison a 4 stroke only fires half the cylinders every revolution. So a 250cc 2-stroke engine should have the same power as a 500cc 4stroke(has the same amount of CC's fired per revolution).
one rotation
In a 4-stroke engine cycle, each valve (intake and exhaust) opens once per cycle. This means that during one complete cycle of the engine, the intake valve opens once to allow air-fuel mixture in, and the exhaust valve opens once to expel exhaust gases. Therefore, each valve will open a total of one time during each 4-stroke cycle.
It takes two revolutions of the crankshaft to complete the cycle of a 4-stroke cycle engine. Each revolution includes the intake, compression, power, and exhaust strokes of the engine.
In a 4-stroke cycle engine, two complete revolutions of the crankshaft are required to complete one cycle, which includes intake, compression, power, and exhaust strokes. Therefore, for each individual stroke (intake, compression, power, or exhaust), one rotation of the crankshaft corresponds to half of that duration. Thus, one stroke occurs for every 180 degrees of crankshaft rotation.
In a typical four-stroke engine, the camshaft completes two revolutions for every one stroke cycle of the piston. This is because the four-stroke cycle consists of intake, compression, power, and exhaust strokes, which require the camshaft to operate the intake and exhaust valves twice during each cycle. Thus, for every complete cycle of the engine, the camshaft turns two full revolutions.
In a two-stroke cycle engine, the crankshaft completes one revolution to complete one thermodynamic cycle. This is because the two-stroke cycle combines both the intake and exhaust processes into a single crankshaft revolution, allowing for one power stroke for every crankshaft rotation. Thus, for each complete thermodynamic cycle, the crankshaft makes one full revolution.
In a two-stroke engine, the crankshaft makes one complete revolution for each cycle of the engine. This means that during the intake and exhaust processes, both occur in a single revolution of the crankshaft. Consequently, each complete cycle of combustion and power generation is achieved with just one turn of the crankshaft.
The volume of blood pumped during each cardiac cycle is known as stroke volume. It represents the amount of blood ejected by the left ventricle in one contraction. It is an important factor in determining cardiac output.
Technician A is correct. The crankshaft must revolve two times to complete one cycle, which as 4 strokes. One half revolution for each stroke. Intake, compression, combustion, exhaust = four strokes to complete a cycle. One half revolution for each stroke of the piston going up or down. Look at a diagram and you'll see this is pretty simple.
Each piston has one TDC position, when it is at its maximum height. During the four stroke cycle, each cylinder has two TDC events. Those are compression and exhaust.