Abstract: An intake manifold for a multi-cylinder internal combustion engine of the type wherein blow-by gas and/or EGR gas is supplied to engine cylinders. The intake manifold comprises a plurality of branch runners each of which has a flange section fixedly secured to a cylinder head of the engine. A rib section integrally bridges the flange sections of the adjacent branch runners and is formed therein with a gas passage through which blow-by gas or EGR gas flows. The gas passage is communicated with the intake air passages of the adjacent branch runners so that the blow-by gas or EGR gas is uniformly distributed into the adjacent branch runners.

Abstract: In the intake apparatus for an engine including an engine body, an intake manifold and an intake collector, the intake collector is disposed along and fixed to the engine body, and the intake manifold is disposed over the intake collector and removably supported between the engine body and the intake collector. Since the intake collector is fixed to the engine body, vibration of the intake collector can be prevented. Since the intake manifold is easily removed from the engine body and the intake collector, maintenance or repair of various devices arranged on or near the engine body and the intake manifold can be facilitated.