1. The noise is probably pre-ignition, commonly called pinking.

2. The program run result shows that the preignition angle's value and its changing rule along with rotate speed and charge match with the practical ones. The simulation result is basic ally correct.

3. This paper describes a system for preignition in motorcycle engine using spark plus as a detecting probe, the author carries out researches on a method how the ionic current coins into being.

4. At the same time, backfire[http://], preignition and fire a gun in the start state of hydrogen fueled engine were avoided.

5. Preignition occurs when the fuel-air mixture ignites before the spark plug fires.

6. A few sentences regarding preignition and detonation may be helpful.

7. This paper introduces a new power supply of preignition for pulse xenon lamp.

8. This paper describes a system for preignition in motorcycle engine using spark plus as a detecting probe, the author carries out researches on a method how the ionic current comes into being.

9. The higher the octane number, the greater the resistance to preignition making a higher compression ratio possible.

10. Based on the physical concept of heat energy of preignition, a new fire susceptibility index (FSI) is used to estimate the forest fire risk.

11. It was found that the restraining effect relies on preignition time, mist flux, discharging time and so on.

12. Sound Identification: Combustion knocks are divided into two classes: preignition and detonation.