Internal combustion engine

An engine makes power to move things.

It works by burning fuel inside. This creates hot gas. The hot gas makes a strong push. This push moves parts like a piston.

This movement helps cars and boats go. It also powers tools like lawnmowers. Some engines even power big ships.

Many engines use gas or diesel. Some can even use peanut oil. Engines are very useful tools.

An internal combustion engine makes power by burning fuel.

This happens inside the engine itself. This is why we call it "internal" combustion. The engine mixes fuel with air. Then, it burns them in a small space. This creates very hot and strong gas. The gas pushes on parts like a piston.

A piston is a cylinder-shaped part. It slides up and down inside a tube. This push turns into movement. This movement can power cars, boats, or planes.

These engines use many types of fuel. Most use gasoline or diesel. Some use natural gas or ethanol. Even peanut oil can work in some engines.

Some engines use a set of steps called a cycle. A four-stroke engine is a common type. Other engines, like jet engines, use a continuous burn. This keeps the power flowing smoothly. Engines help us move all over the world.

An internal combustion engine is a machine that turns fuel into movement.

This happens because fuel burns inside a small space called a combustion chamber. When the fuel burns, it creates very hot and high-pressure gases. These gases expand and push against parts of the engine to create force. This force can move a piston, a turbine blade, or a rotor. This way of working changes chemical energy into kinetic energy, which is the energy of motion.

This energy is what allows us to drive cars or fly planes.

There are different ways these engines work depending on their design. In a reciprocating engine, parts like pistons move back and forth.

Many of these use a four-stroke cycle to complete their work. Other engines, like the Wankel engine, use a rotor to create motion. Some engines use continuous combustion instead of stopping and starting.

Gas turbines and jet engines are examples of this type. Even rocket engines use this continuous burning principle to fly through space. Each type of engine is built to handle different jobs.

Many clever people helped invent and improve these machines over many years.

In 1807, Nicéphore Niépce and Claude Niépce ran a prototype called the Pyréolophore. This engine used dust explosions to power a boat on a river in France. Later, in 1876, an engineer named Nicolaus Otto designed the Otto engine. This was a very important modern design for piston engines. In 1892, Rudolf Diesel developed the compression ignition engine.

These discoveries changed how the world moves.

Today, we see these engines being used in many different places.

Most cars, motorcycles, and boats use reciprocating piston engines. Large ships and even some locomotives use diesel engines for power. Some engines are even used to drive huge electric generators for the power grid. These engines can run on many types of fuel. Most use gasoline, diesel, or natural gas.

Some can even use renewable fuels like ethanol or biodiesel. Even peanut oil was used by Rudolf Diesel in 1900.

If you look under the hood of a car, you are seeing an engine block.

This block is often made of cast iron or aluminum. It holds the cylinders where the burning happens. Inside the cylinders, pistons slide up and down to capture the force of the gas. To keep the engine from getting too hot, some use water to cool it.

Others use metal fins to let the air cool the engine. This clever design keeps the machine running smoothly and safely.

An internal combustion engine (ICE) is a heat engine that converts chemical energy into kinetic energy.

This process occurs when a fuel source burns with an oxidizer, usually air, inside a combustion chamber. The chamber is an integral part of the working fluid flow circuit. When the fuel burns, it creates high-temperature and high-pressure gases. These gases expand and apply direct force to engine components. This force moves parts over a distance to power a machine. Depending on the design, this force might act on pistons, turbine blades, a rotor, or a nozzle.

In a reciprocating engine, the movement is based on parts sliding back and forth. The base of these engines is the engine block.

This block is typically made of cast iron or aluminum. It contains the cylinders where the combustion happens. Most engines arrange these cylinders in one row, known as a straight engine. They can also be in two rows, called a boxer or V engine. Some modern engines use three or four rows, known as a W engine.

To manage heat, water-cooled engines use a water jacket. This is a passage in the block where cooling fluid circulates. Other small engines are air-cooled. These use metal fins protruding from the block to transfer heat to the air.

Inside the cylinder, a piston acts as the primary moving part. The piston is a short cylindrical component that seals one end of the cylinder. It must seal against the high pressure of the combustion products. To prevent leaks, rings are fitted around the piston's circumference. These rings keep gases from escaping into the crankcase. The gas pressure hits the piston crown, which is the top surface. This force is transferred through the piston web to a gudgeon pin. The pin connects the piston to a connecting rod, which turns the motion into useful work.

Engineers classify these machines by how they ignite the fuel and how they move. One major group is reciprocating engines, which include two-stroke and four-stroke designs. For example, the Otto cycle is a four-stroke process. Some engines use spark-ignition (SI), which is common in gasoline engines. Others use compression-ignition (CI), which is common in diesel engines.

There are also rotary engines, such as the Wankel engine.

A different class uses continuous combustion. This includes gas turbines, jet engines, and most rocket engines. These engines do not use intermittent bursts of burning like a piston engine does.

History shows a long timeline of discovery for these machines. In 1791, John Barber developed the gas turbine. In 1807, Nicéphore Niépce and Claude Niépce ran a prototype called the Pyréolophore. This engine used controlled dust explosions to power a boat on the Saône river. In 1808, François Isaac de Rivaz invented a hydrogen-based engine using an electric spark.

Later, Nicolaus Otto designed the first modern internal combustion engine in 1876. This was the Otto engine. In 1892, Rudolf Diesel developed the compression ignition engine. These inventions paved the way for modern transport and industry.

Internal combustion engines are used in many different ways today. Most are used in mobile applications like cars, aircraft, and boats. These are often called internal-combustion-engine vehicles (ICEV). In the air, planes might use reciprocating engines or jet engines. Helicopters often use turboshafts, which are gas turbines optimized for torque. On land, engines drive motorcycles, cars, and even locomotives.

On a much larger scale, engines drive electric generators for the power grid. Some combustion turbines can produce 100 MW of electrical output. Combined cycle power plants even use the high-temperature exhaust to run a steam turbine. This can reach efficiencies of 50% to 60%.

Fuel choice is a major part of how these engines function. Most rely on hydrocarbon-based fuels like gasoline, diesel, or natural gas. They can also use renewable fuels. For example, biodiesel is used in compression ignition engines. Bioethanol is used in spark ignition engines. As early as 1900, Rudolf Diesel used peanut oil to run his engines.

While hydrogen is rarely used, it can be obtained from fossil fuels or renewable energy. This variety allows engines to be used in everything from small lawnmowers to massive ships.