Which component in an aircraft engine is most affected by improper grinding of valves?

Improper grinding of valves can significantly affect the cylinder head in an aircraft engine. The cylinder head houses the valves and provides a sealing surface for the combustion chamber. When valves are ground incorrectly, it can lead to issues such as poor seating, which prevents the valves from sealing properly. This can cause a loss of compression, decreased engine performance, and potential overheating due to improper gas flow.

A well-ground valve ensures a tight seal against the seat, allowing combustion gases to remain within the combustion chamber during the power stroke. If the seating surface is uneven or improperly shaped due to grinding errors, it not only compromises performance but can also lead to increased wear on the valve and seat over time, further complicating engine reliability.

While the exhaust manifold and pistons are important components, their function is less directly impacted by valve grinding issues than that of the cylinder head, which is critical for maintaining proper operation of the engine's combustion process.