Blowby gas treatment system for multiple cylinder engine

A multiple cylinder engine comprising:

• a first cylinder and a second cylinder;
• a first fuel supply device that is arranged to always operate during operation of the engine connected to the first cylinder;
• a second fuel supply device that is capable of stopping an operation of the second cylinder during the operation of the engine connected to the second cylinder;
• and
• a blowby gas treatment system comprising:
• first and second branch pipes of an intake manifold connected to the first and second cylinders respectively;
• and
• a breather pipe arranged to supply a blowby gas of the engine to a blowby gas inlet opening onto the first branch pipe, the blowby gas inlet being provided on one side of the first branch pipe facing a first end in an axial direction of a crankshaft,
• a breather chamber with a blowby gas outlet arranged to communicate with a blowby gas inlet via the breather pipe, the blowby gas outlet being provided on one side of the breather chamber facing a second end opposite to the first end in the axial direction of the crankshaft,
• wherein the breather chamber is arranged to collect a blowby gas of the engine and a labyrinth is formed in the breather chamber to separate oil from the blowby gas;
• the engine is V-shaped and the breather chamber is arranged between the first and second cylinders;
• the branch pipes are arranged in an inverted V-shape.