Internal combustion engine crankcase vacuum method and apparatus

Details Internal combustion engine crankcase vacuum method and apparatus Internal combustion engine crankcase vacuum method and apparatus

1994-11-09

1996-08-06

McMahon, Marguerite

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2506

Patent

active

055424015

ABSTRACT:
An apparatus and method are provided for maintaining a substantially constant partial vacuum in the crankcase of an internal combustion engine. Maintaining the partial vacuum, in addition to essentially eliminating crankcase emissions, substantially reduced tailpipe emissions of carbon monoxide and unburned hydrocarbons as evidenced by a test conducted according to California Air Research Board test method 505 (hot). The crankcase partial vacuum also has the added benefit of reducing the rate at which the engine lubricating oil was contaminated.

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