Engine Notes


Engine Types




Engine Cycles





Two and Four Stroke Engines






Engine Strokes







Pressure and Temperature (two stroke SI engine)


Pressure and Temperature (four stroke SI engine)





Normal Combustion  vs. Detonation




Normal and abnormal combustion


4 Stroke Engine (pθ diagram)





Effects of Charging and Compression Ratio on Net Work

* The inclosed area in the pV diagram represents the net work of the gases.








Normal and Abnormal Combustions

* Normal combustions are in dotted lines and abnormal combustions in solid lines on the pV diagrams. Decrease in area means less net work from the gasses.






Effects of injection timing (CI Engine)
Effects of ignition timing (SI Engine)



CI Engine and SI Engine Comparison



Camshaft drive arrangements