Is the knocking sound of the gasoline car the same as that of the valve top pillar?

When the engine of valve [1] is idling, there is an obvious, crisp, intermittent and rhythmic "click, click" sound, especially on the side of the valve chamber.

(2) When the engine speed changes, the noise also changes.

(3) When the engine temperature changes, the noise has no obvious change.

(4) The abnormal sound did not change during the "ignition" test.

When you touch the throttle of a gasoline engine, you can hear a complicated "creak, creak" sound; Starting the throttle repeatedly from idle speed to medium speed (throttle-on test), the abnormal sound increases with the increase of engine speed, especially at the moment of refueling.

There was a strong "clang, clang" sound from the oil filler, and the sound reverberated around the beam, like the sound of a wooden stick hitting an iron drum.

During the "flameout" test, the abnormal sound was obviously weakened or disappeared, and the abnormal sound recovered immediately after returning to work.

When the engine is idling, the upper part of the cylinder will make an obvious knocking sound, which sounds like the sound of a small hammer hitting the concrete floor.

The noise is obvious when the car is cold, and it gradually weakens or disappears with the increase of engine temperature.

When the cylinder is subjected to "misfire" test, the noise is obviously weakened or even disappeared; There is obvious noise at the moment when the cylinder returns to work.