Tail pipe for drafting engine exhaust gas

Abstract From the Canadian patent

A tail pipe for drafting an engine exhaust gas includes: a front perforated pipe connected to an engine exhaust silencer or muffler, an outer pipe jacketed outside the front pipe for leading environmental air therein, a central pipe connected on a rear end portion of the front pipe and disposed inside the outer pipe, and plural swirl perforated plates each helically secured between the central pipe and the outer pipe and each swirl plate securing the rear portion of the front pipe between the outer pipe and the central pipe, whereby upon a discharge of an engine exhaust gas, the pressure of a partial exhaust gas stream is reduced by the induced environmental cooling air and the pressure of …