Preignition: The phenomenon of a hot spot such as a glowing spark or deposit igniting the air-fuel mixture earlier than the spark plug. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostPower Next PostPressure cap