Paper: Vapor Phase (Ebullient) Cooling of Internal Combustion Engines

For years engineers have known the value of elevated temperature cooling of internal combustion engines. As far back as 1916, Muir, Rushmore, Harrison, and others applied cooling systems to automobile engines which they called "controlled temperature," "steam cooling," and "evaporative cooling." While tests included operating at various controlled pressures to raise or lower the boiling point of the coolant, the control utilizing the natural law of boiling was found to be the most suitable.