TRAVERSE CITY, Mich. -- Toyota is overhauling its engines to boost fuel economy, cut emissions and increase performance. But unlike other automakers, Toyota does not plan to reduce engine size and strap on turbochargers across the board.
Eventually, all of Toyota’s engines will get the same technology that debuted in the redesigned 2018 Camry, Ben Schlimme, Toyota Motor North America’s powertrain executive program manager for advanced planning and research, said Tuesday at the CAR Management Briefing Seminars.
The Camry’s new 2.5-liter four-cylinder engine, called Dynamic Force is rated at 206 hp and gives Toyota’s top-selling sedan an EPA rating of 41 mpg on the highway.
Toyota didn’t reduce the size of the Camry’s engine — it was 2.5 liters for 2017. Instead, engineers worked to improve engine efficiency in four main areas: friction reduction, exhaust flow, cooling and in the intake system.
As a result, the 2.5-liter engine has increased its thermal efficiency — the rate at which fuel is converted to work — to 40 percent. Few engines have attained that rate.
Schlimme highlighted the engine’s intake system as a key feature of the Dynamic Force engine strategy. By changing the angle of the intake valve, widening the angle between the intake and exhaust valve, using modified pistons and laser cladded valve seats, the air/fuel mixture tumbles into the cylinder in a swirling motion. The swirl improves combustion, resulting in more power and lower emissions.
“Dynamic Force is not solely aimed at the 2.5-liter engine,” Schlimme said. “We are working to bring it to other segments.” That includes trucks and utility vehicles, said Schlimme.
He said Dynamic Force for V-6 and V-8 engines are in “concept” form.