A supercharged engine exhaust manifold

Abstract

The invention relates to an exhaust manifold of a supercharged engine, the exhaust manifold has a first converging part between the lower part of the first exhaust manifold and the lower part of the second exhaust manifold, and merges under the first converging part It is the first merging part; there is a second converging part between the lower part of the third exhaust manifold and the lower part of the fourth exhaust manifold, and it is merged into the second merging part below the second converging part; the first merging part and the second converging part The second merging part extends to the third converging part, and merges into the third merging part below the third converging part; the exhaust main pipe under the third merging part communicates with the supercharger through the outlet flange. The present invention is applied to a supercharged gasoline engine with 4 cylinders and a firing order of 1-3-4-2. The exhaust flow rate and the peak value of the exhaust pressure wave are high, the scavenging is sufficient, and the gap between two cylinders of adjacent firing orders is reduced. Exhaust interference, the quality of exhaust gas in the cylinder is significantly reduced, the combustion state has been significantly improved, and the ignition angle at low speed and full load can be advanced by 2-4°CA.

Description

technical field [0001] The present invention relates to an engine exhaust manifold, and more particularly, the present invention relates to a new and improved solution for an engine exhaust manifold, wherein the exhaust manifold is used in an inline four-cylinder supercharged engine. Background technique [0002] The traditional in-line 4-cylinder engine adopts a four-in-one exhaust manifold, and there is mutual interference in the exhaust gas between cylinders. For example, the exhaust gas of the first cylinder will affect the exhaust process of the adjacent third cylinder, resulting in an increase in the mass of exhaust gas in the third cylinder, resulting in Especially in low-speed full-load and nearby working conditions, combustion deterioration, or knocking combustion, must be controlled through measures such as fuel enrichment or delaying the ignition angle, which affects engine power and economy. In terms of exhaust energy utilization, there is no relevant patent lite...

AI Technical Summary

Problems solved by technology

The above-mentioned patents are mainly aimed at improving the exhaust flow capacity of naturally aspirated engines and accelerating the ignition speed of catalytic converters, improving exhaust gas purification capabilities. For supercharged engines, using exhaust pressure waves to improve scavenging, shortening the length of exhaust pipes and increasing exhaust gas Energy, improved combustion, and increased dynamics are not covered

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