Engine intake system with modulated tuning

Internal-combustion engines – Multiple cylinder

Patent

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Details

F02B 2700

Patent

active

045495068

ABSTRACT:
Modulated tuning intake systems for multi-cylinder internal combustion engines are described wherein dual plenums are each connected to essentially half the engine cylinders and tuned to provide enhanced charging efficiency in a predetermined, normally lower, range of engine speeds. A controlled valved connector or tube is provided between the plenums to effectively modify or eliminate their separate character by joining them at other selected engine speeds, such as the middle and higher speed ranges, thus providing enhanced charging efficiency at these speeds and obtaining improved volumetric cylinder charging efficiency over all, or a major portion, of the engine operating speed range.

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