Dual-mode induction system

Details Dual-mode induction system Dual-mode induction system

1991-04-15

1992-03-03

Okonsky, David A.

Internal-combustion engines

Multiple cylinder

123 52MV, F02M 3510

Patent

active

050922858

ABSTRACT:
A dual-mode induction system for a multi-cylinder internal; combustion engine wherein an individual intake passage or runner communicates between a common air plenum and each engine cylinder. A separate bypass having an individual port at each engine cylinder extends from the plenum and each internal runner to provide a substantially shorter passage to each engine cylinder and a valve covers each bypass port and is operated in response to engine speed and/or related vehicle operating parameters to simultaneously close the bypasses at low engine speed to force intake air through the longer internal runners and provide a ram tube effect and to simultaneously open the bypasses at high engine speeds to force intake air through the shorter internal runners at a higher frequency and low resistance.

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