Exhaust system for V-twin engines

Abstract

An exhaust system for V-twin engines having a pair of engine cylinders connected to a crankcase to define a V-space therebetween. Each of the cylinders includes an exhaust port which faces outwardly of the V-space, and a pair of mufflers are attached directly to the exhaust ports of the respective engine cylinders. In this manner, the exhaust ports and mufflers are disposed outside of the V-space to promote the ready dissipation of the heat associated with the exhaust gases to the atmosphere. A common exhaust conduit is connected to both of the mufflers, and carries exhaust gases from the mufflers to a common exhaust outlet.

What is claimed is:  
     
         1 . An internal combustion engine, comprising: 
 a crankcase;    a pair of cylinders connected to said crankcase and defining a V-space therebetween, each cylinder including an exhaust port facing outwardly of said V-space;    a pair of separate mufflers respectively attached to said exhaust ports; and    an exhaust conduit connected to both of said mufflers, said exhaust conduit including at least one exhaust outlet.    
     
     
         2 . The internal combustion engine of  claim 1 , wherein said exhaust ports are disposed on respective sides of said cylinders which are opposite said V-space.  
     
     
         3 . The internal combustion engine of  claim 1 , wherein said exhaust conduit includes opposite end portions, said end portions respectively attached to said mufflers.  
     
     
         4 . The internal combustion engine of  claim 3 , wherein said exhaust conduit is attached at said opposite end portions to said mufflers via a slip-fit connection, said exhaust conduit captured between said mufflers.  
     
     
         5 . The internal combustion engine of  claim 1 , wherein said exhaust outlet is positioned centrally with respect to said cylinders, said exhaust outlet directing exhaust outwardly of said engine.  
     
     
         6 . The internal combustion engine of  claim 1 , wherein said exhaust outlet is positioned adjacent one of said cylinders, said exhaust outlet directing exhaust gases outwardly to one side of said engine.  
     
     
         7 . The internal combustion engine of  claim 1 , wherein said cylinders are disposed in a perpendicular relationship with respect to one another.  
     
     
         8 . The internal combustion engine of  claim 1 , wherein said mufflers are attached directly to said exhaust ports.  
     
     
         9 . An internal combustion engine, comprising: 
 a crankcase;    a pair of cylinders connected to said crankcase and disposed in an angular relationship to one another, each said cylinder including an exhaust port;    a pair of separate mufflers respectively attached directly to said exhaust ports; and    a common exhaust conduit connected between said mufflers, said exhaust conduit including an exhaust outlet.    
     
     
         10 . The internal combustion engine of  claim 9 , wherein said cylinders define a V-space therebetween, said exhaust ports disposed on a side of said cylinders opposite said V-space, said mufflers disposed externally of said V-space.  
     
     
         11 . The internal combustion engine of  claim 9 , wherein said exhaust outlet is positioned centrally with respect to said cylinders, said exhaust outlet directing exhaust outwardly of said engine.  
     
     
         12 . The internal combustion engine of  claim 9 , wherein said exhaust outlet is positioned adjacent one of said cylinders, said exhaust outlet directing exhaust gases outwardly to one side of said engine.  
     
     
         13 . The internal combustion engine of  claim 9 , wherein said cylinders are disposed in a perpendicular relationship with respect to one another.  
     
     
         14 . The internal combustion engine of  claim 9 , wherein said exhaust conduit includes a pair of end portions, said end portions respectively attached to said mufflers.  
     
     
         15 . The internal combustion engine of  claim 14 , wherein said exhaust conduit is attached at said opposite end portions to said mufflers via a slip-fit connection, said exhaust conduit captured between said mufflers.  
     
     
         16 . In combination: 
 an internal combustion engine, comprising: 
 a crankcase; and  
 two cylinders connected to said crankcase and disposed in an angular relationship to one another, each cylinder including an exhaust port; and  
   an exhaust system, comprising: 
 two separate mufflers respectively attached to said exhaust ports; and  
 a common exhaust conduit having two end portions respectively connected to said mufflers, said exhaust conduit including an exhaust outlet.  
   
     
     
         17 . The combination of  claim 16 , wherein said end portions of said exhasut conduit are respectively attached to said mufflers via a slip-fit connection, said exhaust conduit captured between said mufflers.  
     
     
         18 . The combination of  claim 16 , wherein said cylinders define a V-space therebetween, said exhaust ports disposed on a side of said cylinders which faces outwardly of said V-space.  
     
     
         19 . The internal combustion engine of  claim 16 , wherein said exhaust outlet is positioned centrally with respect to said cylinders, said exhaust outlet directing exhaust outwardly of said engine.  
     
     
         20 . The internal combustion engine of  claim 16 , wherein said exhaust outlet is positioned adjacent one of said cylinders, said exhaust outlet directing exhaust gases outwardly to one side of said engine.