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Automotive engine exhaust system

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TLDR
In this article, a pair of front exhaust pipes are joined to a rear exhaust pipe by an exhaust pipe joint, and downstream end portions projecting into the exhaust manifold are formed annular spaces for receiving reflected waves travelling in the upstream direction and limiting the propagation of the reflected waves into the downstream ends of the front exhaust pipe.
Abstract
A pair of front exhaust pipes are joined to a rear exhaust pipe by an exhaust pipe joint. The front exhaust pipes have downstream end portions projecting into the exhaust pipe joint so that between the outer walls of the downstream end portions and the inner walls of the exhaust pipe joint there are formed annular spaces for receiving reflected waves travelling in the upstream direction and limiting the propagation of the reflected waves into the downstream ends of the front exhaust pipes.

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References
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Patent

Exhaust manifold for internal combustion engine

TL;DR: An exhaust manifold assembly for an internal combustion piston engine employs one exhaust tube for each cylinder and a collection chamber for each pair or larger group of exhaust tubes Each collection chamber is connected to a plurality of exhaust tube so that the exhaust timing spacing is the same in each collection chamber as discussed by the authors.
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Exhaust system for four-stroke internal combustion engines

TL;DR: In this article, a high-efficiency combustion gas exhaust system for four-stroke internal combustion engines using two overlapping converging conical pipes to provide excellent scavenging at high piston speeds is described.
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Motor vehicle exhaust systems

TL;DR: In this paper, the exhaust branch pipes 1, 3, 5, 7 are connected in apertures in a plate 11 which closes the wide end of a funnel 15, the narrow end of which communicates with the main exhaust pipe.
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Exhaust gas cleaning device of internal combustion engine

TL;DR: In this article, the authors aim to obtain optimum cleaning of exhaust gas by maintaining inertia effect of the exhaust gas flow, by maintaining the velocity of the gas flow and the inertia of the flow.
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An exhaust system for internal combustion engines

David Vizard
TL;DR: In this paper, the authors propose a system consisting of an exhaust pipe 6 having an inlet end which surrounds the exhaust port, and a stub pipe 3 having an outwardly projecting flange plate 4 which is disposed between the inlet and the engine surface.