A six-stroke cycle engine comprising: an intake passage (10) having a downstream end connected to a combustion chamber (6) and including no throttle valve provided therein; and an exhaust passage (15) having an upstream end connected to the combustion chamber (6) and including a catalyst (16)…

In an internal-combustion engine provided with a system for variable actuation of the intake valves (6) of the cylinders (I, II, III, IV), some of said cylinders (II, III) are deactivated in given conditions of operation of the engine by interrupting the supply of fuel. During de-activation, the…

The engine (1) has two turbochargers (8,9) and two cylinders (3). Each cylinder is provided with two gas outlet openings (4a,4b) to which exhaust pipes (5a,5b) are connected respectively. The exhaust pipes (5a) connected to two cylinders, are merged at primary exhaust manifold (6a) to form overall…

The engine comprises of a cylinder head which presents four cylinders (4), each including two gas inlet conduits (6, 8). An end of each conduit presents a dissymmetrical side (32) inclined with respect to a longitudinal axis (16) of the conduit in order to support a gas flow along a circumferential…

The method involves opening and closing an exhaust valve (27-1) of a cylinder (1), during an exhaust stage. A high pressure is developed in the cylinder during the opening of the exhaust valve. An exhaust valve (27-2) is then opened and closed during another exhaust stage, where the exhaust valve…

In a set of heads (1) for the cylinders (3) of internal combustion engines with desmodromic valve operation, each head (1) comprises an assembly (4a) of one or two inlet valves (4), and an assembly (6a) of one or two exhaust valves (6), so as to form heads with two, three and four valves. The…