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| 单词 | pre-ignition |
| 释义 | pre-ignition in British English (ˌpriːɪɡˈnɪʃən) noun ignition of all or part of the explosive charge in an internal-combustion engine before the exact instant necessary for correct operation pre-ignition in Automotive Engineering (priɪɡnɪʃən) noun (Automotive engineering: Vehicle components, Engine, transmission, and exhaust) ignition , ignition , ignition Pre-ignition is a situation in which the fuel-air mixture in a spark ignition engine ignites before the timed spark, because of contact with a hot surface. Over-heated spark plugs and exhaust valves are the main causes of pre-ignition. Pre-ignition might be the consequence of the spark plug tip getting too hot. Thermal coatings also resist detonation and pre-ignition by keeping metal hot spots from forming on piston crowns or head chambers. |
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