| 摘要 |
PURPOSE:To expand a fuel-air mixture in each of upper-stage and lower-stage chambers and enable to promote atomization by a method wherein a distributing chamber provided in an intake manifold is composed of an upper-stage chamber connected to a carburetor and a lower-stage chamber communicated to the upper-stage chamber. CONSTITUTION:The intake manifold M is provided with the distributing chamber 21 by which the fuel-air mixture formed in the carburetor is introduced through an introducing port 19 opened at a fitting surface 18 of the carburetor. The mixture is distributed from the distributing chamber 21 to each cylinder through a branch passage 24. The distributing chamber 21 is composed of the upper-stage chamber 21a and the lower-stage chamber 21b larger than the chamber 21a in volume, and the branch passages 24 connected to each cylinder in left and right cylinder groups are extended from the lower-stage chamber 21b at left and right side walls. A passage hole 23 communicating the chambers 21a, 21b to each other is provided in a partition wall 21c between the chambers 21a, 21b. Accordingly, the atomization of the fuel-air mixture introduced into the distributing chamber 21 can be promoted by the expansion thereof and the heat from chamber walls each time when the mixture flows into the chambers 21a, 21b. |
