What is the purpose of choked or taper-ground cylinders in aircraft engines?

Choked or taper-ground cylinders are designed primarily to maintain a straight cylinder bore at operating temperatures. As engine temperatures rise, materials can expand, which may lead to warping or misalignment of the cylinder bore. By tapering or chocking the cylinder, designers ensure that the cylinders remain straight as they heat up, thereby promoting better sealing and performance of the piston rings against the cylinder walls. This allows for consistent compression ratios and efficient power generation within the engine.

While other options may discuss aspects of piston ring performance and compression pressure, they do not accurately reflect the primary function of choked or taper-ground cylinders. Maintaining a straight cylinder bore is essential for optimal engine efficiency, durability, and overall performance.