Toyota today rolled out two new gasoline engines in Japan that are the first steps in a new engine series from the company that focuses on efficiency. These 1.0-liter and 1.3-liter powertrains will be making their way into redesigned Toyota models in the future, and a total of 14 new engines will reportedly be introduced globally by 2015.
The first of these new engines is a 1.3-liter four-cylinder that runs on an Atkinson cycle. This special, efficiency-minded engine cycle is typically used in Toyota’s hybrid models, and uses a high compression ratio for greater thermal efficiency -- but at the expense of slightly reduced overall power. This new 1.3-liter engine also uses variable-valve timing and puts a priority on low friction for a very high maximum thermal efficiency of 38 percent. This means that considerably less heat is being wasted compared with a normal internal combustion engine, and in combination with its other features, should make for fuel economy gains of approximately 15 percent compared with current, similar Toyota engines. It’s possible that this new 1.3-liter engine could make it into some variant of the next Toyota Prius, which is said to debut sometime later this year.
The second engine is a 1.0-liter gasoline engine that was developed in conjunction with Daihatsu. Toyota doesn’t give many specifics on this engine, but we suspect that it is a three-cylinder. It also achieves high thermal efficiency of 37 percent thanks to its low friction, high compression ratio, and high tumble port that distributes the fuel more evenly throughout the cylinders. It could be used for small, affordable Japanese-market cars.
Keep an eye out for more engine news from Toyota as it begins this new series of 14 redesigned powertrains that focus on efficiency.