Patent ID: 6840037
Filing Date: 2005-01-11
Classification: F01N,F02B,Y02T

Abstract:
1. An exhaust pulse control unit for creating negative pressure exhaust pulses upstream of the unit in a four stroke engine, the unit having a single chamber with an inlet, a separate exhaust pulse expansion and capture zone adjacent the inlet an intermediate containment zone with the expansion and capture zone being adjacent one end of the intermediate zone, an outlet adjacent the other end of the intermediate zone, the outlet having a greater diameter than the inlet and a merging zone between the intermediate zone and the outlet the expansion and capture zone consisting of a first stage and a second stage with the first stage providing a relatively rapid increase in exhaust gas volume and further expansion of the exhaust gas volume occurring in the second stage to thereby cause exhaust gas pulses to move along the intermediate zone, wherein an atmospheric return pulse interacts with an expanded exhaust pulse in the intermediate zone, without the presence of a muffling effect or muffling device in any of the zones and wherein the first stage extends at an angle to the longitudinal axis which is less than an angle to the longitudinal axis by the second stage.