The pressure generated by a single-cylinder motorcycle engine can vary depending on several factors, including the engine design, compression ratio, fuel type, and operating conditions.
During the compression stroke of an engine, the pressure inside the combustion chamber increases as the piston compresses the air-fuel mixture. In a typical gasoline-powered motorcycle engine, the peak compression pressures can range from about 8 to 14 bar (800 to 1400 kilopascals or 116 to 203 pounds per square inch). These values are approximate and can vary depending on the specific engine and its characteristics.
During the power stroke, the pressure reaches its maximum level, referred to as peak cylinder pressure. In motorcycle engines, the peak cylinder pressures can range from approximately 50 to 100 bar (5000 to 10000 kilopascals or 725 to 1450 pounds per square inch). Again, these values are approximate and can vary based on the engine design and other factors.
It's important to note that these pressures are general estimates and can vary significantly depending on the specific engine and its specifications. Different motorcycle engines, such as those used in racing or high-performance applications, can generate even higher pressures due to their design and optimization for increased power output.