Cylinder head

Abstract

The invention provides an exhaust system including a cylinder head having a plurality of exhaust ports. Integrally formed with the cylinder head are a plurality of independent and separate tubes. The tubes are cast, molded or otherwise integrally formed with the exhaust ports of the cylinder head. The cylinder head and tubes eliminate the need for an exhaust flange, welding the tubes to the exhaust flange and securing the exhaust flange to the cylinder head. As a result, the present invention has less weight and improved performance over prior art cylinder head and exhaust assemblies.

1 . A method of manufacturing an exhaust system comprising the steps of:
 selecting a length of each of a plurality of tubes;   casting a cylinder head with a plurality of exhaust ports formed therethrough and the plurality of tubes, wherein the cylinder head and the plurality of tubes are integrally formed and each of the tubes corresponds to one of the exhaust ports.   
     
     
         2 . The method of  claim 1  wherein each of the tubes are independently connected to one of the exhaust ports. 
     
     
         3 . The method of  claim 2  further comprising the step of:
 connecting at least two of the tubes to an exhaust manifold. 
 
     
     
         4 . The method of  claim 2  further comprising the step of:
 connecting all of the tubes to a primary pipe of the exhaust manifold. 
 
     
     
         5 . The method of  claim 2  further comprising the step of:
 machining an interior of at least one of the tubes to smoothen the interior of at least one of the tubes. 
 
     
     
         6 . The method of  claim 1  wherein at least one of the tubes is perpendicular to the exhaust ports of the cylinder head. 
     
     
         7 . The method of  claim 1  wherein all of the tubes are perpendicular to the exhaust ports of the cylinder head. 
     
     
         8 . The method of  claim 1  wherein each of the tubes has a substantially circular cross-section.