DOE-HDBK-1018/1-93Diesel Engine FundamentalsFUNDAMENTALS OF THE DIESEL CYCLEFundamentals of the Diesel Cycle Summary (Cont.)A two-stroke engine requires one rotation of the crankshaft to complete onecycle. The events occur as follows:Intake - the piston is near BDC and exhaust is in progress. The intakevalve or ports open and the fresh air is forced in. The exhaust valves orports are closed and intake continues. Compression - after both the exhaust and intake valves or ports are closed,the piston travels up towards TDC. The fresh air is heated by thecompression.Fuel injection - near TDC the fuel is injected by the injectors and the fuelstarts to burn, further heating the gasses in the cylinder.Power - the piston passes TDC and the expanding gasses force the pistondown, rotating the crankshaft. Exhaust - as the piston approaches BDC the exhaust valves or ports openand the exhaust gasses start to flow out of the cylinder. Rev. 0ME-01Page 29
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