Supercharging and Internal Cooling Cycle for High Output

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Abstract
It is now well known that reduction of the temperature of a charge before compression in an engine is far more effective as a means of increasing the output than is an increase of the pressure. By example and diagram the author shows the gains which may be made by supercharging with and without intercooling the charge in the inlet manifold. He then discusses the dual-pressure supercharging cycle, and high-pressure supercharging with high combustion pressures. It has been determined that by selection of blower-discharge pressure and proper timing of the inlet-valve closing, engines equipped with the dual-pressure supercharging system will carry full sea-level rating at all altitudes.

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