 The Cummins Westport
(CWI) ISL G natural gas engine uses Stoichiometric Combustion with cooled gas exhaust recirculation (EGR) and a Three-Way
Catalyst (TWC). The ISL G is the first of the CWI products to use a TWC for emissions control. The B and C series engines
utilize lean burn technology and an oxidation catalyst.
Stoichiometric combustion with cooled EGR creates the ideal combustion process with the chemically correct mixing of fuel and
air, offering increased power density and thermal efficiency. It reduces in-cylinder combustion temperatures and creates an
oxygen-free exhaust, which then enables the use of a TWC for nitrogen oxide (NOx) control.
What is a TWC?
A TWC is a simple, maintenance-free device that reduces three harmful emissions: hydrocarbons (HC), carbon monoxide (CO), and
nitrogen oxide (NOx). The end products are: water (H2O), carbon dioxide (CO2), and nitrogen (N). A TWC is
packaged as a replacement muffler and gives consistent performance across all duty cycles.
Benefits of using a TWC
The ISL G with a TWC requires no diesel particulate filter (DPF) or selective catalytic reduction (SCR). It meets 2010 EPA and
CARB emissions standards today, and is maintenance-free.
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