What type of engine is used in the Cessna 172?

The Cessna 172 is equipped with a four-cylinder engine, specifically the Lycoming O-320 series or a similar variant depending on the model and modifications. This type of engine configuration is optimal for general aviation aircraft as it provides a good balance of power, weight, reliability, and efficiency.

The four-cylinder engine in the Cessna 172 produces sufficient horsepower for a flight range that typically includes local flights, pilot training, and private usage. Additionally, the design of a four-cylinder engine contributes to smoother operations and can be more economical in fuel consumption compared to engines with more cylinders. This makes it well-suited for the intended performance characteristics of the Cessna 172, such as its cruise speed and climb rate.

Engines with six or eight cylinders are generally found in larger, faster aircraft or those that require higher power outputs for specialized performance, which is beyond the needs of a Cessna 172. A two-cylinder engine would not provide the necessary power and reliability for an aircraft of this type and size, particularly for maintaining the performance standards established for general aviation flying. Therefore, the four-cylinder design aligns perfectly with the operational requirements of the Cessna 172, making it the correct choice.