Air Flow The Internal Combustion Engine（气流和内燃机）.pdfVIP

Join Jim McFarland as he steps into his role as the Performance Professor and shares a wealth of knowledge and experience that will help take you to a higher level of per- formance. Air Flow The Internal Combustion Engine Without adequate and properly that air is pulled or “drawn” into ciency of 100%. It can be less or timed airflow, power from an cylinders rather than forced there more, depending upon a variety of internal combustion engine will be by atmospheric or mechanically circumstances. less than maximum. Following are derived pressure. This difference In reality, an engine’s volumetric some keys to making certain you in perspective of how air enters an efficiency at each rpm of measure- know how to obtain horsepower engine is important to remember, ment can be represented on a from proper supply of air. Also particularly when considering the graph. Sample v.e. and torque included are some basic defini- way carburetors operate. It will be curves are provided elsewhere in tions of related and important a concept to which these “lessons” this lesson (see illustration #5). terms. will refer as discussions unfold Interestingly, a volumetric efficien-