🔍 Key Concepts

• two-stroke vs four-stroke diesel engine design differences • how power per stroke and number of power strokes per revolution differ between the two types • typical weight and temperature characteristics of four-stroke vs two-stroke engines

💭 Think About

• Think about how often each type of engine produces power during crankshaft rotation and how that affects the overall engine size and construction needed for the same horsepower. • Consider which design (two-stroke or four-stroke) usually needs to be more robust and heavier to handle the same power output. • Look at each option and ask: is this really something that makes a four-stroke worse than a two-stroke, or does it actually sound like a two-stroke feature or an unrealistic condition?

✅ Before You Answer

• Verify which engine type generally has a higher power-to-weight ratio (more horsepower for less weight). • Check whether scavenging ports are normally associated with two-stroke or four-stroke diesels. • Ask yourself if it is realistic for intake valves to run hotter than exhaust valves, given where the hot combustion gases flow.