Swirl ratio: The ratio of the angular rotational speed of air about the cylinder axis to the angular rotational speed of the crankshaft. 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 PostSwirl Next PostTop Dead Centre (TDC)