What is the cause of the motor vehicle knock and how to prevent it?
This phenomenon is knocking. Compared with normal combustion. During the knocking, the mixture is compressed to a high degree, the combustion rate is very fast and produces high temperature and high pressure, accompanied by local combustion. Strong knocking will reduce the engine output power. The pressure generated by the knock is directly impacted to the top of the cylinder head and piston, resulting in a "da da" metal percussion. The temperature of the various parts of the combustion chamber will also increase the temperature. Improve the compression ratio, ignition advance angle is too large, the mixture burned too fast, are prone to knocking. But these are also an important means to improve the engine power, so how to prevent the knock has been the technical staff of the subject. There are many ways to prevent knocking. Such as improving the shape of the combustion chamber, eliminating the combustion chamber dead ends, so that the spark plug in the middle of the combustion chamber and so on. Modern motorcycles on the engine are mostly equipped with ignition in advance electronic control device. When the engine is slightly detonated, the device can delay the ignition advance angle and effectively control the occurrence of knocking. Another method is to use high octane gasoline. Most of the participating racing cars use special fuel to increase the compression ratio, but the general motorcycle can not use this method.
What is the cause of the motor vehicle knock and how to prevent it? Knock is an abnormal combustion phenomenon of the engine. Is the designer in improving the engine power first encountered problems. Experienced knights know that the motorcycle in the low-speed driving is not a knock, and once the high-speed lock when the throttle is fully open, the engine will issue a "da da" metal percussion. The high-performance engine has a small sound. It is difficult to hear. A strong knock can cause damage to the engine. Knock is an abnormal combustion phenomenon of the engine. Is the designer in improving the engine power first encountered problems. Experienced knights know that the motorcycle in the low-speed driving is not a knock, and once the high-speed lock when the throttle is fully open, the engine will issue a "da da" metal percussion. The high-performance engine has a small sound. It is difficult to hear. A strong knock can cause damage to the engine.
