- Fuel Efficiency: Four-stroke engines are more fuel-efficient than two-stroke engines because they burn fuel more completely. Two-stroke engines lose a significant amount of unburned fuel through the exhaust port during the scavenging process, whereas four-stroke engines have a separate intake and exhaust stroke, which allows for a more efficient combustion process.
- Emissions: Four-stroke engines produce fewer emissions compared to two-stroke engines. Two-stroke engines emit unburned hydrocarbons, carbon monoxide, and other pollutants due to the scavenging process and incomplete combustion. On the other hand, four-stroke engines have better emission control systems, such as catalytic converters and oxygen sensors, which help in reducing harmful emissions.
- Oil Consumption: Two-stroke engines require a mixture of oil and fuel (premix) for lubrication, which leads to higher oil consumption. In comparison, four-stroke engines have a separate oil reservoir and use a dedicated lubrication system, reducing overall oil consumption.
- Noise and Vibration: Four-stroke engines tend to be quieter and produce less vibration than two-stroke engines. The additional combustion stroke in a four-stroke engine helps in smoother power delivery, resulting in reduced noise and vibration levels.
- Durability and Maintenance: Four-stroke engines are generally more durable and require less frequent maintenance compared to two-stroke engines. They have a longer lifespan due to reduced wear and tear on engine components, thanks to the separate lubrication system and better combustion process.
Due to these advantages, four-stroke engines are widely used in modern automobiles, trucks, motorcycles, and other applications where fuel efficiency, emissions, noise control, and durability are critical factors.
