Is the compression stroke called the expansion stroke?

Is the compression stroke called the expansion stroke?

Higher compression ratios also means that the distance that the piston can push to produce power is greater (which is called the expansion ratio).

What is expansion stroke?

The stroke in the operating cycle of a reciprocating engine in which both the inlet and exhaust valves are closed, the fuel-air mixture has been ignited and burned, and the piston is being forced downward by expanding gases. This is the only stroke in which power is produced.

What is suction stroke?

: the stroke of the piston in an internal-combustion engine that effects the drawing in of the gaseous mixture to the engine cylinder.

What is the distinction between compression stroke and power stroke?

Compression stroke: at the end of the intake stroke, both inlet and exhaust valves are closed. Power stroke: when the piston ascends and reaches top dead center, an electric current ignites the spark plug and as the mixed gas burns, it expands and builds pressure in the combustion chamber.

Is TDC on compression stroke?

There are many reasons why you might need to find an engine’s top dead center. Top dead center is the point when the piston of the number one cylinder in an engine is at its highest point, and on the compression stroke of the engine’s four-stroke cycle.

What happens during the expansion stroke?

Combustion/Power/Expansion stroke The combustion stroke is the third phase, where the ignited air/fuel mixture expands and pushes the piston downwards. The force created by this expansion is what creates an engine’s power.

What is the exhaust stroke occurs?

The exhaust stroke is the final stroke and occurs when the exhaust valve is open and the intake valve is closed. Piston movement evacuates exhaust gases to the atmosphere. As the piston reaches BDC during the power stroke combustion is complete and the cylinder is filled with exhaust gases.

What is the function of suction stroke?

Suction Stroke – With pistons moving downwards and the opening of the inlet valve creates the suction of clean air into the cylinders. 2. Compression – With the closing of Inlet valve the area above the piston gets closed.

What happens during suction stroke in 4 stroke cycle engine?

The four-stroke engine cycle Suction stroke:The piston descends towards Bottom Dead Center (BDC) and the outside air pressure is equalizing the reduced in-cylinder pressure through the open intake valve. If the engine is Port Fuel Injected (PFI) the fuel is introduced during the intake stroke.

What are the four piston strokes?

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft. Encyclopædia Britannica, Inc.

How does the piston move in compression stroke?

Compression stroke: Both valves are now closed and the piston compresses the air fuel into a much smaller volume, preparing the mixture for ignition. The resulting explosion forces the piston downward and rotates the crankshaft, which in turn propels the vehicle.

How does a suction stroke engine work in a car?

In a suction stroke, the inlet valve is in the opened condition and the exhaust valve remains closed. The atmospheric air is drawn into the cylinder as the piston moves from TDC to the BDC due to the partial vacuum air is sucked inside the cylinder.

How does the compression stroke in a direct injection engine work?

The mixture enters the cylinder through an intake valve at the top of the cylinder. The compression stroke is the second of four stages in a four-stroke engine. In this stage, the fuel/air mixture (or air alone, in the case of a direct injection engine) is compressed to the top of the cylinder by the piston.

What is the cycle of a four stroke SI engine?

The complete cycle of operation of a four-stroke SI engine consists of the following four strokes: During the suction stroke, the inlet valve is kept opened and the exhaust valve remains closed. The piston travels from TDC to BDC in case of vertical cylinder engine.

Why does a 4 stroke engine have more friction?

There are many moving parts and hence there is more friction, therefore the engine has less mechanical efficiency. The weight of the engine is more because of heavier flywheel construction. Due to more parts, the maintenance required quite often.