The hot engine performs worse than the cold one. The reasons are as follows:
First, the piston ring side clearance is too small. When the engine heats up, the piston ring expands within the groove, losing its elasticity and failing to create a proper seal with the cylinder wall. This leads to reduced compression and power loss.
Second, the clearance between the valve and the valve guide is too tight. As the engine warms up, the valve stem expands and may get stuck in the guide. Once the valve opens, it might not close properly, causing improper combustion and potential engine damage.
Third, the cylinder clearance is too small, and the thermal expansion coefficient is high. This results in increased resistance during thermal expansion, making it harder for the engine to start and reducing its starting speed.
Fourth, the axial clearance of the crankshaft is too narrow. When the engine heats up, the crankshaft may rub against the end face of the main bearing bush, leading to excessive friction and possible mechanical failure.
Fifth, the low-pressure rubber hoses may crack. In a hot engine, these cracks can expand, allowing air to be drawn into the system. This can lead to oil contamination and affect the engine's performance.
Sixth, there may be micro-cracks on the upper edge of the cylinder liner. These cracks can widen when the engine heats up, allowing cooling water to enter the combustion chamber. This can cause serious damage, including hydrolock and internal corrosion.
In summary, overheating can lead to multiple mechanical issues that reduce efficiency, increase wear, and potentially cause engine failure. Proper maintenance and monitoring of clearances and components are essential to prevent these problems.
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