Hanover, Germany (September 20, 2006) - The new Cummins Westport ISL G 8.9-litre natural gas engine makes its debut at the IAA Hanover commercial vehicle show. Available from 2007, it is the next evolution in natural gas engine technology designed for urban bus and truck applications using LNG or CNG.

The ISL G engine, developed by Cummins Westport Inc, a Cummins joint venture company, surpasses the stringent EPA 2007 emissions standards for nitrogen oxides (NOx) and particulate matter (PM). It is capable of meeting the EPA 2010 emission standards of 0.2 gm/bhp-hr NOx and 0.01 gm/bhp-hr PM. It is also expected to easily meet the Euro 5 emissions levels planned for 2009.

The ISL G's suitability for urban bus operation is derived from a combination of extremely low emissions with high performance and low engine noise. The engine has ratings to 320hp with 1350 Nm peak torque across a wide rev range, performing superbly when mated to either manual or automatic transmissions. The low installed weight also means that the engine also has the highest power-to-weight ratio in its class. It also benefits from improved fuel efficiency, reliability, and lower total ownership costs.

Rather than the familiar selective catalytic reduction (SCR) system used for Cummins Euro 4 diesel engines, the 8.9-litre ISL G uses cooled exhaust gas recirculation (EGR) and stoichiometric combustion vs. Lean Burn technology in current engines.

"Cummins is in a strong position in having all of the key emissions technologies available to use appropriately for each product and market in where we operate. Due to the inherently lower levels of NOx in a gas engine, Cummins proven EGR is the more appropriate and cost effective solution for a natural gas application." says Mr. Greg Young, Cummins Westport Business Leader for Europe.

In addition to the EGR system, a passive, maintenance free three-way catalyst is specified - which is highly effective in the control of hydrocarbons and carbon monoxide as well as nitrogen oxides.

"The Cummins B, C and L Natural Gas engines have had substantial success in bus applications in major cities around the world. The new ISL G will increase this reputation even further, providing high performance with ultra low emissions." adds Mr Young.

Cummins Westport manufactures and sells the world's widest range of low emissions alternative fuel engines for commercial transportation applications and has over 12,000 units in service around the world. Westport Innovations is the leading developer of technologies that allow engines to operate on clean-burning fuels such as natural gas, hydrogen, and hydrogen-enriched natural gas (HCNG). Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins serves customers in more than 160 countries through its network of 550 company-owned and independent distributor facilities and more than 5,000 dealer locations. Cummins reported net income of $550 million on sales of $9.9 billion in 2005.