As the engine warms up, heat from the combustion chamber will force the rings to expand. They’re valuable tools in the performance of any engine, and that’s why engine builders pay close attention to this tedious but very essential assembly step.Ĭorrectly sizing of the gap for each ring is important because of heat. Rings also control oil and transfer heat. The piston rings are the key defense against cylinder pressure leaking into the crankcase, thereby leaving horsepower on the table. We walk you through the process step-by-step in this story. Perhaps the most critical engine assembly step is file fitting and installing the piston rings with the correct gap.
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