🔍 Key Concepts
• Understand how a two-stroke diesel cycle completes intake, compression, power, and exhaust in only two strokes of the piston
• Know what happens on the upward stroke vs the downward stroke in a two-stroke engine
• Recall how ports and valves or scavenge air help combine events in a two-stroke engine
💭 Think About
• Ask yourself: In a two-stroke engine, which events are combined so that all four functions (intake, compression, power, exhaust) occur in only two piston movements?
• Think about what happens right after fuel is injected and ignited—which stroke is that, and what other event happens near the same time?
• Consider the direction of piston travel for each named stroke: which events naturally occur as the piston moves up, and which as it moves down?
✅ Before You Answer
• Be clear on which two of the four basic events (intake, compression, power, exhaust) are considered the named strokes in a two-stroke engine
• Verify which events occur mainly on the upward stroke of the piston
• Verify which events occur mainly on the downward stroke of the piston, even if intake or exhaust overlap at the ends of those strokes