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Monday, January 4, 2021
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PSI has a new 8.8-liter ultra-low-NOx propane engine that has received certification by the U.S. Environmental Protection Agency (EPA) and California Air Resources Board (CARB). Produced in collaboration with Navistar’s IC Bus brand, the engine is certified to a NOx emission standard of 0.02 grams per brake horsepower (g/bhp-hr), making it one of the cleanest propane engines available on the transportation market. The 8.8-liter engine is certified beyond EPA’s strictest emission standards and also exceeds CARB’s optional low-NOx standard for heavy-duty engines. In addition, its CO2 emission rate is 10% better than that of current competitive propane engines. The new engine offers 270 hp with 565 lb-ft of torque, comparable to PSI’s existing propane engines. PSI will continue to offer its conventional 8.8-liter propane engine and the new ultra-low-NOx version. The ultra-low-NOx engine will power IC school buses. Production is anticipated early next year. School bus fleets making the switch from diesel to propane engines are eligible to receive federal, state, and private grants. psiengines.com
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