🔍 Key Concepts

• Differences in temperature and heat load between intake and exhaust valves • Why exhaust components often need greater heat and corrosion resistance than intake components • Typical materials and design features used for high-temperature engine parts

💭 Think About

• Which valve (intake or exhaust) is exposed to the hottest gases, and how does that affect material choice? • Look at each option and ask: is this mainly about strength/heat resistance, corrosion protection, or flow pattern? Which of those is especially critical for an exhaust valve? • For each choice, decide: would this feature reasonably be needed on both valves or especially/only on the exhaust valve?

✅ Before You Answer

• Be clear on which side of the engine cycle sees hot combustion gases vs. cooler incoming air/fuel mixture • For each material (high alloy, low alloy, zinc), think about its temperature limits and where it would realistically be used • Ask whether any listed feature is more related to gas-flow efficiency than to surviving high temperature