An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to?

Prepare for the FAA Reciprocating Powerplant Test. Utilize flashcards and multiple-choice questions, each with explanations and hints. Enhance your knowledge and ace your exam!

When manifold pressure is increased while maintaining a constant RPM, the engine is supplied with a greater volume of air and fuel mixture, resulting in increased power output. This boost in power leads to higher combustion pressures during the power stroke, which in turn increases the forces acting on the engine's components, including the bearings.

As the bearing load increases, this is primarily due to the heightened thrust loads and lateral loads from the pistons and connecting rods as they push against the crankshaft with more force. The increase in manifold pressure does not just enhance performance but also raises the stress on the engine's bearings, causing them to experience greater loading.

It's important to recognize that while RPM influences the rotational speed and loads, the increase in manifold pressure directly correlates with increased power demand, which significantly impacts bearing loads. Therefore, the correct answer reflects the relationship between increased manifold pressure and the resulting increase in bearing load.

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