🔍 Key Concepts

• Piston travel and ring position during the compression stroke and at top dead center (TDC) and bottom dead center (BDC) • Where gas pressure and temperature are highest inside the cylinder • How side thrust from the connecting rod affects liner wear near the top of the stroke

💭 Think About

• During which part of the stroke is the gas pressure and temperature against the liner wall the highest, and what does that do to wear? • Think about where the top compression ring stops and reverses direction: what happens to lubrication and metal contact at that point? • Which of the listed positions best matches the area where hot, high‑pressure gases most strongly press the top ring against the liner?

✅ Before You Answer

• Identify which option places the wear near the top ring travel area, not at the skirt or oil control ring location alone • Confirm that the location corresponds to high combustion pressure and temperature, not the coolest or most flooded-with-oil area • Check that the crank and stroke position described matches the end of the compression/combustion zone where ring reversal and gas loading are greatest