Nissan Motor Company Limited

Yasuo Sakai

Yasuhiko Nakagawa

Yasuo Nakajima

Hiroaki Miyazaki

Tosimitu Matuoka

An internal combustion engine comprises a cylinder and an intake passageway opening into the cylinder. In order to secure sufficiently high volumetric efficiency at high speed under high load operating conditions, the intake passageway is so configured as to pass therethrough a sufficient volume required for the combustible charge to be drawn into the cylinder per unit time. The intake passageway is provided with swirl means for causing the combustible charge passing through the intake passageway to swirl in the cylinder. The swirl means comprises at least one flow restrictor means so arranged as to urge the combustible charge to enter into the cylinder in a tangent direction to the cylinder wall. Control means is provided whereby the flow restrictor means reduces effective flow area thereof at low speed under light load operating conditions, thus securing strong swirl, and the flow restrictor means increase effective flow area thereof at high speed under high load operating conditions, thus securing high volumetric efficiency.

Internal combustion engine with intake arrangement to produce swirl in

Siamesed exhaust ports are formed in an engine cylinder head and contain therein port liners. An exhaust manifold has therein an aftercombustion chamber which is enclosed by a heat insulator and communicates with the siamesed exhaust ports thereby preventing reduction of temperature of the exhaust gases admitted into an exhaust manifold from the engine. Thus, sufficient oxidation of the combustible compounds in the exhaust gases is achieved in the aftercombustion chamber of the exhaust manifold.

Internal combustion engine having siamesed exhaust ports and an

An internal combustion engine comprises a main combustion chamber defined on one side by a piston and also having an auxiliary combustion chamber connected by a torch flame passageway to the main combustion chamber. The ratio of cross sectional area cut through the torch flame passageway at right angles thereto to the volume of the auxiliary combustion chamber being from a value that is greater than 0.2cm.sup.2 /cc to 0.3cm.sup.2 /cc. The volume of the auxiliary combustion chamber is from 6 percent to 15 percent of the total clearance volume that is the combined volume including a volume of the auxiliary combustion chamber, a volume of the main combustion chamber at the top dead center position of the piston and a volume of the torch flame passageway.

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Yokohama, Japan

Yasuo Sakai