What is a disadvantage of an articulating piston assembly when compared to an aluminum alloy trunk piston?

The disadvantage of an articulating piston assembly in comparison to an aluminum alloy trunk piston primarily relates to the increased tensile loading on the connecting rods. This type of piston assembly often involves a more complex design, which can place greater stress on the connecting rods during the engine's operation. The articulating mechanism can lead to variations in motion and load distribution that ultimately result in higher tensile forces, which may necessitate stronger and potentially heavier components to withstand the increased stress.

This can affect overall engine efficiency and may lead to more frequent maintenance or replacement of the connecting rods, which is a key consideration for engine performance and durability. In contrast, aluminum alloy trunk pistons typically have a more straightforward design that allows for better load distribution, minimizing the tensile loading on connecting components.