Exhaust device for two-stroke internal combustion engine

Abstract

The present invention discloses a compact efficient exhaust handling device that is particularly advantageous for use with small two-stroke, piston-type internal combustion engines, which device provides both exhaust scavenging and charge densification in the cylinder of the engine by utilizing a first muffler section formed in a helical or wrapped configuration, and a muffler expansion chamber also formed in a wrapped configuration, and axially displaced from the first section.

1 . An exhaust handling system for an internal combustion engine adapted to receive the exhaust gases from the combustion cylinder of such engine and to provide exhaust gas scavenging and fuel-charge densification in said engine, said exhaust handling system comprising: 
 A. a first enclosed housing attachable to an exhaust port of an internal combustion engine, containing a radially extending exhaust channel formed therein, said channel communicating between an inlet opening of said housing and arranged to communicate with the exhaust port of an internal combustion engine, and an outlet port at the opposite end of said channel; and,    B. a second enclosed housing attached to said first housing and axially displaced therefrom, said second housing comprising an expansion chamber therein formed by an internal chamber wall, said expansion chamber having an inlet opening at one portion thereof communicating with said outlet port of said first housing and an exhaust port formed therein.    
   
   
       2 . A tuned exhaust system for an internal combustion engine having at least one exhaust port for ejecting spent exhaust gases, said tuned exhaust system comprising: 
   1  A. A first enclosed exhaust flow channel adapted for attachment to an internal combustion engine, said first flow channel having at one end thereof an inlet port adapted for receiving exhaust gases from the exhaust port of an engine, an extended flow tube coiled in a first radial plane containing said inlet port, and an outlet port at the opposite end of said flow channel; and    B. an expansion channel attached to said first flow channel and having an extended chamber folded into a second radial plane axially displaced from said flow channel, and having an inlet opening communicating with said flow channel outlet port, and an exhaust opening located an extended distance down said expansion channel from said inlet opening and adapted to exhaust gas flow into the atmosphere.