In a four-stroke/cycle diesel engine, piston...

Question 1 / 270705eccefa1bacbc34ba4d47584

Question 1 of 270705eccefa1bacbc34ba4d47584

In a four-stroke/cycle diesel engine, piston blow-by can result in increased __________.

Question 1 of 27070

In a four-stroke/cycle diesel engine, piston blow-by can result in increased __________.

🔍 Key Concepts

• piston blow-by in a four-stroke diesel and where those leaking gases actually go • the difference between cylinder compression pressure and pressures in other engine spaces (crankcase, scavenge, exhaust) • how worn piston rings affect the space below and around the piston during operation

💭 Think About

• When gases leak past the piston rings during the power stroke, which part of the engine do they enter first? • Which of the listed pressures is normally on the low-pressure side of the piston, and would therefore be most affected by leakage from the high-pressure side? • For each choice, ask: does blow-by directly feed into this space, or would it be separated by other components/valves?

✅ Before You Answer

• Identify which component is directly beneath the piston in a four-stroke diesel (no guessing here). • Confirm that compression pressure occurs above the piston in the cylinder, not in external spaces. • Verify whether scavenge air and exhaust manifold spaces are connected directly to the ring belt area, or isolated by valves.

Question 1 of 27070

In a four-stroke/cycle diesel engine, piston blow-by can result in increased __________.

crankcase pressure

compression pressure

scavenge air pressure

exhaust manifold pressure