If a four-stroke/cycle diesel engine is started by admitting high pressure air into the cylinders, the pistons receiving the charge of starting air must be __________.
ā¢ Four-stroke diesel cycle (intake, compression, power, exhaust) and what happens in each stroke ā¢ How starting air actually turns an engine that is not yet running ā¢ Piston and valve positions when air is admitted to create rotation
ā¢ On which stroke is the cylinder already full of compressed, hot air versus mostly empty or open to the exhaust? ā¢ During which stroke would admitting high-pressure air push the piston in a way that actually helps turn the crankshaft, instead of just escaping out a valve? ā¢ Think about when both valves are closed and the piston can be forced down to produce torque on the crankshaft.
ā¢ Verify which stroke has both valves closed and the piston positioned so pressure can build ā¢ Check during which stroke the cylinder volume and piston direction will turn the crank effectively from a stop ā¢ Eliminate any strokes where intake or exhaust valves are open, since air would not be trapped to push the piston
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