or load bank. Dynamometer or load bank testing are the preferred methods, but realistically it is not always an option. Regardless, breaking in the engine is critical. If this is not done correctly or completely, then the engine will most likely perform poorly, smoke, and consume oil. Often these symptoms are irreversible over time. The term, “breaking in” an engine refers to the process where combustion temperatures and operating conditions force the rings and cylinder bores to conform to each other sealing the combustion gasses within the cylinders. Idling will not produce the temperatures and forces needed.