Editing Diesel engine (section)

===Mass===
The average diesel engine has a poorer power-to-mass ratio than an equivalent petrol engine. The lower engine speeds (RPM) of typical diesel engines results in a lower [[Power (physics)|power]] output.<ref name="Braess_2012_225" /> Also, the mass of a diesel engine is typically higher, since the higher operating pressure inside the combustion chamber increases the internal forces, which requires stronger (and therefore heavier) parts to withstand these forces.<ref name="Schreiner_2014_22" />