Which feature is characteristic of a ladder-frame engine block?

A ladder-frame engine block is designed to offer enhanced strength and stability, especially in high-performance and heavy-duty applications. One of the distinguishing features of this design is that the main bearing caps are typically integrated into a one-piece casting. This construction method provides a robust structure that reduces flex and distortion under load, ensuring that the engine maintains its alignment and performance over time. The one-piece casting allows for a smoother surface for the crankshaft to rotate on, which can lead to reduced friction and improved longevity of the engine components.

In contrast, separate bearing caps, which are bolted onto the block, can be found in other engine designs but do not offer the same level of structural integrity as the one-piece casting. Modular construction and removable cylinder liners, while beneficial in certain applications for ease of maintenance or replacement, do not define the fundamental characteristics of a ladder-frame engine block. The focus on integrating the main bearing caps into the block in a one-piece cast design is what sets the ladder-frame engine block apart from other configurations.