US 2001/0039799 A1 · GAS FLOW HEADERS FOR INTERNAL COMBUSTION ENGINES

Abstract

An exhaust header system for an internal combustion engine having improved exhaust gas flow characteristics. Primary pipes extend from openings in a flange bolted to the engines exhaust ports. The primary pipes come together at a collector pipe into which the primary pipes extend slightly. The ends of the primary pipes are substantially parallel, uniformly spaced around the collector pipe axis and have end surfaces lying substantially in a single plane. A generally pyramidal transition piece has a base corresponding to, and secured to, the primary pile end surfaces so as to cover the area between the pipe ends. The pyramid apex extends along the collector pipe centerline toward the exit end. The length and cross section of the transition piece is selected to provide a smooth transition from the greater combined internal cross section of the primary pipe ends to the lesser cross section of the collector pipe exit end.

Claims17

Dependent claims

An exhaust system for an internal combustion engine which comprises:

a flange adapted to be secured to exhaust ports of an internal combustion engine;
a plurality of openings through said flange, each adapted to align with an engine exhaust port;
primary pipes secured at their first ends to said flange at said openings;
a collector pipe surrounding the second ends of said primary pipes;
the second ends of said pipes lying substantially parallel and in contact with each other, substantially equally spaced around the collector pipe centerline and having end surfaces substantially in a single plane;
a transition piece having an essentially pyramidal shape, the base of said pyramid covering the area between the primary pipe ends and secured to said pipe end surfaces;
said collector pipe having an entrance internal cross section at said pipe ends substantially equal to the combined internal cross sections of said primary pipe ends;
said collector pipe gradually reducing in internal cross section over its length;
and
means at the exit of said collector pipe for connection to an exhaust pipe.

7 more elements

Dependencies are inferred from the claim text.

Gas flow headers for internal combustion engines

Life of this patent

Gas flow headers for internal combustion engines

Life of this patent

Abstract

Claims17