What is the main consequence of exceeding maximum manifold pressure?

Exceeding the maximum manifold pressure can lead to potential engine failure due to several critical factors. Manifold pressure is an indicator of the engine's performance and is a key measurement in maintaining the proper air-fuel mixture. When the manifold pressure is too high, it indicates that the engine is running under excessive load with more air being forced into the cylinders than is safe for the engine's design. This can cause detrimental stress on engine components, including the pistons, crankshaft, and valves.

High manifold pressure can lead to knocking or detonation, where the air-fuel mixture ignites prematurely, causing abnormal combustion that can damage components within the engine. Additionally, excessive pressure can force more fuel into the mixture than the engine was designed to handle, leading to rich mixtures that can also damage the engine by washing oil off the cylinder walls or causing overheating due to inefficient combustion processes.

In the long run, if these conditions persist without corrective action, it can result in catastrophic engine failures, necessitating significant repairs or even a complete engine overhaul. Thus, maintaining manifold pressure within its specified limits is crucial for engine longevity and performance.