The size of engines powering Class 8 tractors is expected to decrease as fleets seek to reduce fuel consumption and meet three rounds of strict federal emission requirements in the next decade.- According to the article from the freightwaves.com and its author Alan Adler

Engines over 10 liters (L) are projected to account for more than 85 percent of Class 8 truck production between 2020 and 2024, according to a study by ACT Research and Rhein Associates.- Adler also wrote in his article

“Although the over 14L engine category will remain the largest segment in 2019, there is a trend to smaller displacement engines in the over-10L market segment,” said Tom Rhein, president of Rhein Associates. The push is being prompted by federal greenhouse gas (GHG) regulations in 2024, he said.

In August 2016, the U.S. Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) finalized Phase 2 standards for medium- and heavy-duty vehicles through the model year 2027. The stricter regulations are intended to improve fuel efficiency and cut heat-trapping GHGs that cause warming of Earth’s surface and the air above it. – You can also read  in Adler’s article

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Source and credits:  freightwaves.com / Alan Adler and iTrucker  / Mario Pawlowski