News & Events



 China’s Weichai Group has officially launched the first commercial, heavy-duty high-speed diesel engine in the world to have a brake thermal efficiency (BTE) above 50%.

During a launch ceremony held in China earlier today, Germany’s TÜV SÜD and the China Automotive Technology and Research Center—the country’s national internal combustion engine testing organization—awarded Weichai certificates for BTE of 50.26%. The engine was jointly unveiled by Ling Wen, vice governor of Shandong Province and academician of the Chinese Academy of Engineering; and Tan Xuguang, chairman of Shandong Heavy Industry Group and Weichai Group.

Since the development of the first diesel engine in 1897, the engine’s brake thermal efficiency increased from 26% to 46%, where it remained until now, according to Weichai. To further improve the diesel engine BTE, Weichai drew on its 70 years of experience in the internal combustion engine R&D. For the past 10 years, the company invested $4.4 billion USD in diesel engine development.

Since 2015, Weichai’s special technical research team has conducted a large number of simulations and bench tests to improve the efficiency of its engines, eventually leading to this historic breakthrough, the company said. Weichai credits the high brake thermal efficiency rate to five proprietary technologies: advanced fields synergy combustion technology, harmonious design technology, exhaust energy distribution technology, subzone lubrication technology, and WISE control technology:

  • Weichai’s fields synergy combustion technology optimizes the design of the air passage, fuel injection, combustion chamber profile and other systems to make the relationship between the velocity field and concentration field in the combustion chamber more harmonious, increasing combustion speed by 30%.
  • Harmonious design technology enables the diesel engine body’s to withstand high peak firing pressure (PFP), which greatly limits combustion improvement, by about 60%. The technology also strengthens the engine’s overall structure.
  • The company’s exhaust energy distribution technology, developed in response to the increased difficulty of emission control caused by improved combustion, pioneered reconstruction of the exhaust system design. The technology adapts to the demand for exhaust gas recirculation while ensuring the efficiency of turbines, meeting regulations and standards, and achieving 1% increase in brake thermal efficiency.
  • Subzone lubrication technology, developed based on the different characteristics of the friction pairs of the system, uses several friction reduction technologies to reduce the overall friction by 20%.
  • WISE control technology takes advantage of Weichai's self-developed ECU by developing a series of more precise control predictive models, making every part of the diesel engine more efficient.

Weichai’s achievement is a historical moment in the development of internal combustion engines, the company said. Several diesel engine experts including Bosch, AVL, FEV, SAE, China Machinery Industry Federation, China Internal Combustion Engine Industry Association, and China-SAE congratulated Weichai on this breakthrough and praised the company for setting a new benchmark for the diesel engine BTE.

The Weichai 50% BTE engine has a 13 L displacement, is rated at 560 hp at 1900 rpm, and utilizes a 2500 bar fuel injection system. The engine meets China VI/Euro VI emission requirements. Increasing brake thermal efficiency from 46 to 50% reduces diesel fuel consumption and CO2 emissions by 8%.


Weichai said it has received strong support from Bosch Group and other global suppliers and R&D consulting firms in the development of this program. Weichai’s future plans include partnering with more global companies to move toward a goal of 55% thermal efficiency, Chairman Tan Xuguang announced during the today’s ceremony.


Weichai America invests $60 million, accounted for 41% of shares, in Power Solutions International (PSI), making Weichai America the largest shareholder of PSI.

Power Solutions International, (Nasdaq:PSIX) is a leader in the design, engineer and manufacture of emissions-certified, alternative-fuel power systems. The two companies have also agreed to a strategic collaboration agreement under which they will work together to accelerate market penetration opportunities for each company’s respective product lines across various geographic markets and end user segments. Through the alliance, PSI will gain access to Weichai’s international manufacturing facilities and supply chain network.   

Shaojun Sun, executive president of Weichai commented, "Our strategic investment into PSI will further enhance Weichai’s globalization strategy and brand recognition by strengthening our presence in the key North American markets. Our collaboration with PSI will create synergies particularly in the areas of product manufacturing, sales and marketing and cost reduction by leveraging the experience, expertise and resources of Weichai and PSI, and will lay a solid foundation for PSI’s future growth in the Chinese and other new markets."

Weichai America have successfully finished the first production-line testing in Sacramento, CA. This is the first production-line testing in Weichai America by randomly selecting the engines from the production-line based on the projected volume and testing them in a third party lab. The emissions data are very close to those tested in the certification test thanks to all the efforts from different departments.

Weichai America received EPA certificate on 6L NA for off-road and stationary non-emergency, emergency NG, and emergency LPG families.

This is the first time of the rich-burn engine families for North American application. The nonemergency family will allow a wide range of fuel operation from 700 to 2362 BTU/CF of LHV, covering commercial pipeline natural gas, LPG, and most of the wellhead gas in oil and gas filed.

Weichai America is proud to offer the North American market a durable, reliable, clean burning, competitively priced alternative for nonroad and stationary applications. We encourage you to learn more about the Company and products on this website (

Weichai America Corp. will be participating in the 2016 Power-Gen International Show from December 13 – 15, 2016 at the Orange County Convention center (9400 Universal Blvd, Orlando, FL. 32819).

Come and see us at Booth 1604

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Weichai America Corp. will be participating in the 2015 Power-Gen International Show from December 8 – 10, 2015 at the Las Vegas Convention Center.

Come and see us at Booth 7616  

See Exhibit Floor Plan > 

Weichai America is pleased to announce that it has received EPA certification on the first of its family of Natural Gas off-road engines for North American application. The engineers at Weichai America’s North American headquarters in Rolling Meadows, IL have been working to utilize commercial heavy duty diesel-based products, with emissions technology from local well-known and proven suppliers. Weichai America is excited to have the WP10NG, 10L Natural Gas engine, officially launched with EPA certification, and proud to offer the North American market a durable, reliable, clean burning, competitively priced alternative for off road applications. The first certifications are for Emergency/Standby Applications rated at 225 kW, and Non-Emergency/Primary power rated at 175 kW. As the first of the planned FULL LINE OF NG ENGINES, we encourage you to learn more about the Company and products on this website ( and/or in the recent article on Diesel Progress’s website which can be found using this link

EPA Approved


Weichai America Corp. will be participating in the Power-Gen International Show from December 9th - 11th. Come and see us at Booth #765! 

See Exhibit Floor Plan > 

Weichai Group, whose international headquarters is located in Weifang, China, will open a major technology development and testing center in Cook County, Illinois, to be known as Weichai America Corporation. The center will serve as the focal point of the Weichai Group’s effort to expand its operation in North America.

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The strategic cooperation conference of Weichai Power and Ferrari F1 team of Italy was held in Shanghai on April 11, 2013, officially announcing the establishment of the strategic alliance between the two brands. Previously, Weichai Power had already become the official global sponsor of Ferrari F1 team in next four years on February 1, 2012

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