What does engine knock mean?
Compared with the normal combustion and detonation mixture during compression, combustion speed and high blast pressure, accompanied by burning phenomenon. Strong detonation will reduce the output power of the engine. The top surface of the detonation pressure waves generated by the direct impact to the cylinder head and the piston, generate dada metal percussion sound, while burning the parts the indoor temperature rise sharply.
To improve the shape of the combustion chamber, the combustion chamber to eliminate the dead, so that the spark plug is located in the middle position of the combustion chamber. The ignition detonation method can eliminate the widespread use of modern motorcycle technology advance device can delay the ignition advance angle, effectively suppress detonation. It also can use high octane gasoline, but high gasoline label the price is higher, and the antiknock performance is very limited. So we must start from the motorcycle compression ratio, fundamentally solve the problem of the knock.
The knock phenomenon is mostly in improving the compression ratio at the same time, the ignition advance angle is too large or mixed gas burning too fast but also prone to detonation. Due to these factors is an important means to improve the engine power, so the knock is an obstacle to technological progress in this area.
The so-called detonation, simply speaking, when the mixture is still in the compression process, the spark plug has not jumped the fire, the high-pressure mixture reached the spontaneous combustion temperature, and began to burn violently abnormal combustion phenomenon
