Presentation on theme: "Diesel Engine The only difference between diesel engine and a four-stroke gasoline engine is: No sparkplug on Diesel engine. Has a higher compression ratio."— Presentation transcript:
1 Diesel EngineThe only difference between diesel engine and a four-strokegasoline engine is:No sparkplug on Diesel engine.Has a higher compression ratio.(14:1 to 25:1)Better fuel mileage.
2 Diesel Engine Intake Stroke: Piston moves from TDC to BDC creating vacuum in the cylinderIntake valve opens allowing onlyair to enter the cylinder andexhaust valve remains closed
3 Diesel Engine Compression Stroke Both valves stay closed Piston moves from BDC to TDC,compressing air to 22:1Compressing the air to this extentincreases the temperature inside thecylinder to above 1000 degree F.
4 Diesel Engine Power Stroke Both valves stay closed When the piston is at the end ofcompression stroke(TDC) the injectorsprays a mist of diesel fuel into thecylinder.When hot air mixes with diesel fuelan explosion takes place in the cylinder.Expanding gases push the pistonfrom TDC to BDC
5 Diesel Engine Exhaust Stroke Piston moves from BDC to TDC Exhaust valve opens and theexhaust gases escapeIntake valve remains closed