Abstract: An engine temperature control system is provided for heating and/or cooling engine fluids to resist deviation of the temperature of these fluids from a temperature range wherein optimal fluid performance is achieved. Some examples of the temperature control system provide for preheating fluids such as coolant, lubricant, or diesel exhaust fluid prior to starting the engine. Other examples of the temperature control system provide for improved cooling of lubricants utilized for high heat generating components such as turbochargers, continuing cooling of these fluids after the engine is stopped.

Abstract: A prechamber is provided for attachment to an inlet of a combustion chamber of an internal combustion engine. The prechamber decreases the compression ratio of the combustion chamber. Some examples of the prechamber include a means of adding a spark plug to an engine that was originally designed to ignite fuel/air through compression of the fuel/air. Other examples of the prechamber include internal structures to introduce “swirl” in fuel/air as it is injected. Still other examples of the prechamber include a plurality of fuel injectors, with each fuel injector being structured to introduce a different type of fuel into the prechamber. A means of selecting a specific type of fuel based on engine operating conditions is also provided.