Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1978-08-29
1980-02-05
Lazarus, Ronald H.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123 75B, 261 23A, F02M 1306
Patent
active
041867068
ABSTRACT:
Several embodiments of induction systems for internal combustion engines including a relatively large main induction passage and a relatively small sub or auxiliary induction passage. The sub-intake passage is sized so that the charge issuing from it into the combustion chamber enters the chamber at a high velocity to improve flame propagation and combustion. Throttle valves are provided for diverting substantially all of the engines idle and low-speed charge requirements into the chamber through the sub-intake passage. In accordance with each embodiment of the invention, means are provided for causing a small amount of the charge flow during these idle and low-speed conditions also to pass through the main induction passage to minimize the effects of fuel condensation during transition from off-idle to high-speed operation. This arrangement also minimizes the likelihood of lean running during idle and low-speed operation as might also be caused by fuel condensation. In certain embodiments of the invention the flow through the main induction passage is provided by notching or relieving the throttle valve that diverts the flow into the auxiliary or sub-intake passage. In other embodiments of the invention temperature responsive means are provided for permitting the flow through the main intake passage when the temperature of the engine is below a predetermined value.
REFERENCES:
patent: 3554174 (1971-01-01), Clawson
patent: 4002704 (1977-01-01), Laprade
patent: 4018199 (1977-04-01), Furucz
patent: 4151820 (1979-05-01), Furucz
Beutler Ernest A.
Lazarus Ronald H.
Yamaha Hatsukoki Kabushiki Kaisha
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