Patent ID: 7690194
Filing Date: 2010-04-06
Classification: F01N

Abstract:
1. A silencer/catalytic converter unit for a two-stroke engine, the silencer/catalytic converter comprising: a first volume configured to receive exhaust from a two-stroke lean burn gas engine via an inlet port; a second volume in fluid communication with the first volume via a plurality of flow pipes, wherein a longitudinal axis of the inlet port is not parallel with longitudinal axes of the flow pipes; an oxidation catalyst disposed in the second volume and configured to reduce emissions in the exhaust; and a pressure relief valve coupled to a valve port into the first volume, wherein the valve port is generally aligned with the inlet port, the pressure relief valve is configured to prevent exhaust pressure excursions from damaging the oxidation catalyst, the first volume is upstream from the second volume, and the pressure relief valve is upstream from oxidation catalyst.