Dugald Clerk developed

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Historical design Dugald Clerk developed the first two cycle engine in 1879. It used a separate cylinder which functioned as a pump in order to transfer the fuel mixture to the cylinder.6 In 1899 John Day simplified Clerk's design into the type of 2 cycle engine that is very widely used today.13 Day cycle engines are crankcase scavenged and port timed.
The crankcase and the part of the cylinder below the exhaust port is used as a pump.

The operation of the Day cycle engine begins when the crankshaft is turned so that the piston moves from BDC upward (toward the head) creating a vacuum in the crankcase/cylinder area.

The carburetor then feeds the fuel mixture into the crankcase through a reed valve or a rotary disk valve (driven by the engine).
There are cast in ducts from the crankcase to the port in the cylinder to provide for intake and another from the exhausst port to the exhaust pipe.

The height of the port in relationship to the length of the cylinder is called the "port timing." On the first upstroke of the engine there would be no fuel inducted into the cylinder as the crankcase was empty.

On the downstroke the piston now compresses the fuel mix, which has lubricated the piston in the cylinder and the bearings due to the fuel mix having oil added to it.
As the piston moves downward is first uncovers the exhaust, but on the first stroke there is no burnt fuel to exhaust.
As the piston moves downward further, it uncovers the intake port which has a duct that runs to the crankcase.

Since the fuel mix in the crankcase is under pressure the mix moves through the duct and into the cylinder. Because there is no obstruction in the cylinder of the fuel to move directly out of the exhaust port prior to the piston rising far enough to close the port, early engines used a high domed piston to slow down the flow of fuel.

Later the fuel was "resonated" back into the cylinder using an expansion chamber design.

When the piston rose close to TDC a spark ignites the fuel.

As the piston is driven downward with power it first uncovers the exhaust port where the burned fuel is expelled under high pressure and then the intake port where the process has been completed and will keep repeating. Later engines used a type of porting devised by the Deutz company to improve performance.
It was called the Schnurle Reverse Flow system.

DKW licensed this design for all their motorcycles.

Their DKW RT 125 was one of the first motor vehicles to achieve over 100 mpg as a result.14Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine

Definition of an engine

An engine or motor is a machine designed to convert one form of energy into mechanical energy.12 Heat engines, including internal combustion engines and external combustion engines (such as steam engines), burn a fuel to create heat, which then creates a force.

Electric motors convert electrical energy into mechanical motion; pneumatic motors use compressed air and others?such as clockwork motors in wind-up toys?use elastic energy.

In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and eventually motion.Źródło: https://en.wikipedia.org/wiki/Engine

Diesel Ignition Process

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Diesel Ignition Process Diesel engines and HCCI (Homogeneous charge compression ignition) engines, rely solely on heat and pressure created by the engine in its compression process for ignition.
The compression level that occurs is usually twice or more than a gasoline engine.
Diesel engines take in air only, and shortly before peak compression, spray a small quantity of diesel fuel into the cylinder via a fuel injector that allows the fuel to instantly ignite.
HCCI type engines take in both air and fuel, but continue to rely on an unaided auto-combustion process, due to higher pressures and heat.
This is also why diesel and HCCI engines are more susceptible to cold-starting issues, although they run just as well in cold weather once started.

Light duty diesel engines with indirect injection in automobiles and light trucks employ glowplugs (or other pre-heating: see Cummins ISB#6BT) that pre-heat the combustion chamber just before starting to reduce no-start conditions in cold weather.

Most diesels also have a battery and charging system; nevertheless, this system is secondary and is added by manufacturers as a luxury for the ease of starting, turning fuel on and off (which can also be done via a switch or mechanical apparatus), and for running auxiliary electrical components and accessories. Most new engines rely on electrical and electronic engine control units (ECU) that also adjust the combustion process to increase efficiency and reduce emissions.Źródło: https://en.wikipedia.org/wiki/Internal_combustion_engine
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