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Power Solutions International 8.8-L Ultra-low NOx Propane Engine Receives EPA Certification


Power Solutions International, Inc. (PSI) announced certification from the US Environmental Protection Agency (EPA) and California Air Resources Board (CARB). The EPA and CARB granted certification for PSI’s 8.8-L ultra-low nitrogen oxide (NOx) emission propane engine for the transportation market.

Produced with Navistar IC Bus, the engine’s certification is to a NOx emission standard of 0.02 grams per brake horsepower. This makes it one of the cleanest propane engines available on the market. The 8.8-L engine is certified beyond the EPA’s strictest emission standards and also exceeds the California Air Resource Board (CARB)’s optional low NOx standard for heavy-duty engines.

Additionally, the engine’s carbon dioxide emission rate is 10% better than that of current competitive propane engines.

“PSI is proud to support the growth of our customer IC Bus, which first introduced the 8.8-L propane engine in 2015,” PSI CEO John Miller says. “We continue to make advancements to our 8.8-L engine, which is clean burning and unmatched in power and performance in the transportation industry.”


The new engine offers 270 hp with 565 lb-ft of torque, comparable to PSI’s existing propane engines. The company will continue to offer its conventional 8.8-L propane engine as well as the new ultra-low NOx version. The brands expect production to begin early next year.

Additionally, the ultra-low NOx 8.8-L engine reaffirms PSI’s commitment to producing clean-running high performance power systems for the transportation industry. In recent years, PSI and IC Bus have worked together on propane- and gasoline-powered alternatives to reduce NOx emissions. NOx emissions are harmful to humans and the environment; they contribute to ozone and smog, as well as other air quality issues.

“IC Bus is proud to once again collaborate with PSI to bring a clean, powerful, high quality alternative fuel engine,” says Trish Reed, vice president and general manager, IC Bus.

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