Patent ID: 6035633
Filing Date: 2000-03-14
Classification: B63H,F01N,Y02T

Abstract:
A water jacketed exhaust pipe for marine engines comprising:an elongated inner liner, said liner having a tail end, said tail end defining a first inwardly tapered section;an elongated outer shell, said shell surrounding said liner about an elongated axis of said pipe, said shell further having a tail end, said shell tail end defining a second inwardly tapered section;a spacer having a top, wherein said spacer is disposed between said outer shell and said inner liner that separates said shell from said liner and defines an inner volume therebetween, said spacer further defining at least one passageway therethrough communicating said volume with an outer volume outside said exhaust pipe, and wherein said passageway is narrow enough to create a back pressure in said inner volume that thereby forcefully elects water through said passageway.