What is the effect of using a taper-ground cylinder?

Using a taper-ground cylinder primarily helps prevent ring sticking. The taper in the cylinder allows for a better fit of the piston rings and ensures they can expand and contract as required during engine operation. This design minimizes the chances of the rings binding or sticking to the cylinder walls, particularly under conditions where thermal expansion might otherwise lead to such issues. By maintaining optimal clearance through the taper design, the movement of the piston rings is facilitated, reducing wear and improving overall engine performance.

While the other options may suggest benefits related to engine performance, they do not specifically address the crucial role of taper-ground cylinders in preventing ring sticking. Enhancements in fuel delivery and airflow are more directly related to other design considerations within the engine, such as injector placements or intake manifold designs, rather than the cylinder's taper ground shape.