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Message: <blockquote data-quote="ALBundy" data-source="post: 430815" data-attributes="member: 15">VE is used to describe the amount of fuel/air in the cylinder in relation to regular atmospheric air. If the cylinder is filled with fuel/air at atmospheric pressure, then the engine is said to have 100% volumetric efficiency. Most NA engines are operating at 70-80% efficiency. To increase it further, force induction is the way to go <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />In actual fact, an engine is just like air pump, drawing air in (with fuel injected and mixed) and then expunging the by products and the cycle repeats.  I do not think Boxer engines will have higher VE than normal inline or V configuration engines. It has more to do with the intake manifold design (that's why ///M cars have individual throttle bodies!), given a particular engine capacity.  Yeah rotary engine has higher bhp/liter, and similarly 2 stroke engines as well, like those ROTAX used in go karting. If we include bikes, the S1000RR is producing 193bhp/liter!! :rock::rock:</blockquote>