Sisäpolttomoottorityyppi

Sisäpolttomoottorityyppi refers to a classification of internal combustion engines based on their operating cycle and design. The most common types are gasoline (petrol) engines and diesel engines, distinguished primarily by their ignition method. Gasoline engines typically use a spark plug to ignite a fuel-air mixture, while diesel engines rely on compression ignition, where the heat generated by compressing air ignites the injected fuel.

Internal combustion engines are also categorized by their operating cycle, most notably the four-stroke and two-stroke cycles. The four-stroke cycle, common in cars and many other applications, consists of intake, compression, power, and exhaust strokes. The two-stroke cycle, often found in smaller engines like those in chainsaws and some motorcycles, completes these functions in just two piston movements, offering higher power-to-weight ratios but generally with lower fuel efficiency and higher emissions.

Further classifications can be made based on cylinder arrangement, such as inline, V-shaped, and boxer (horizontally opposed) engines, each offering different advantages in terms of size, balance, and vibration characteristics. Engine displacement, a measure of the total volume swept by all the pistons, is another key characteristic that influences an engine's power output. The combination of these design features defines a specific sisäpolttomoottorityyppi, impacting its performance, efficiency, and intended applications.