Compact tuned air induction system for engine
AssigneeSanshin Kogyo Kabushiki Kaisha
InventorGoichi Katayama
Life of this patent
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Abstract
An internal comustion engine has an air induction system that provides an intake passage and an intake silencer, wherein there are a plurality of openings between the silencer and the intake passage. The openings can be selectively closed so as to effectively lengthen or shorten the flow path through the intake passage. upstream portions of the intake passage are disposed within the intake silencer so as to facilitate compactness of the induction system. The openings are closed during low and medium engine speeds, and are opened during high engine speeds.
Claims26
An outboard motor comprising a power head having a cowling enclosing a space, an engine disposed within the cowling and configured to drive a substantially vertically oriented crankshaft, and an air induction system disposed within the cowling and configured to deliver air from the space into a combustion chamber of the engine, the air induction system comprising an intake silencer and at least one intake runner, the intake silencer having an outer wall, an inlet port through the wall for drawing air from the space into the intake silencer, a runner extension pipe integrally formed with the intake silencer, the runner extension pipe having an upstream end and a downstream end, the upstream end opening within the intake silencer and the downstream end opening into the intake runner, and a runner hole formed through the outer wall of the intake silencer and communicating with the intake runner at a point adjacent the downstream end of the runner extension pipe, a valve disposed in the outer hole and configured to selectively open and close the hole, and when the valve is closed, an intake passage is defined from the upstream end of the runner extension pipe to a downstream end of the runner pipe, and when the valve is opened, the intake passage is defined from the runner hole to the downstream end of the runner pipe.
An air induction system for improving the torque characteristics of an outboard marine engine and configured to be positioned within a limited space between the engine and an associated protective cowling, the induction system comprising an intake silencer and an intake manifold, the intake manifold comprising at least one generally linear runner extending from the silencer to the engine, the runner opening into the silencer at a runner opening, a runner opening valve disposed in the runner opening and configured to selectively close the opening, a runner extension having an upstream end opening into the silencer and a downstream end opening into the runner so that an intake passage between the silencer and the engine is effectively lengthened when the runner opening valve is closed.
An air induction system for improving the torque characteristics of an engine, the induction system comprising an intake silencer and an intake manifold, the intake manifold comprising at least one generally linear runner extending from the silencer to the engine, the runner opening into the silencer at a runner opening, a runner opening valve disposed in the runner opening and configured to selectively close the opening, a runner extension having an upstream end opening into the silencer and a downstream end opening into the runner.
A method of improving torque characteristics of an outboard motor engine at low, middle and high engine speeds, comprising:
- providing an intake silencer and an intake conduit, the intake conduit extending from the intake silencer to an intake passage of the engine;
- providing a second intake conduit extending from the intake silencer to a portion of the first intake conduit;
- automatically closing a valve between the silencer and the first intake conduit during low and medium engine speeds so as to provide a long flow path extending from the silencer through the second intake conduit and first intake conduit to the intake passage of the engine;
- and
- automatically opening the valve between the silencer and the first intake conduit during high engine speeds so as to provide a shortened flow path extending from the silencer through the first intake conduit to the intake passage of the engine.
Dependencies are inferred from the claim text.