Blow-by gas recirculating device

Abstract

A blow-by gas recirculating device includes an inlet pipe in communication with the intake passage for an automobile engine, and a heat-insulating member. Particularly, the inlet pipe communicates between a blow-by gas producing source and a heat-insulating member positioned between a carburetor and an intake manifold, all forming part of an intake system for the engine. The heat-insulating member has two intake through-holes which form part of the intake passage for the engine and an inlet-pipe-admitting hole which extends from the outer side-surface of the member to the peripheral surface of one of the intake through-holes. The inlet pipe, one end of which is disposed in the inlet-pipe-admitting hole, has an average coefficient of linear expansion of no less than 16.7.times.10.sup.-6 /deg. in a temperature range of -20.degree. to 200.degree. C., and a modulus of longitudinal elasticity of no more than 12980 kg/mm.sup.2. The end of the inlet pipe is positioned in the inlet-pipe-admitting hole and an adhesive is applied. The blow-by gas producing source may comprise the crank case or a cylinder head cover. In the latter case, the positive crank-case ventilating pipe connects the cylinder head cover to the intake system for the engine.