Toyota is showing off a couple of new engines, designed to be downright miserly with precious fuelstuffs. Here’s some of the release:
One of the engines is a 1.3-liter gasoline engine in which Toyota is employing the Atkinson cycle — normally used in dedicated hybrid engines. Use of the Atkinson cycle provides an increased expansion ratio and reduces waste heat through a high compression ratio (13.5), resulting in superior thermal efficiency. Toyota aims to further improve the fuel efficiency of the engine by utilizing other innovations including an intake port with a new shape that generates a strong tumble flow (whereby the air-fuel mixture flows in a vertical swirl) inside the cylinder, and a cooled exhaust gas recirculation (EGR) system paired with Variable Valve Timing-intelligent Electric (VVT-iE) technology to improve combustion and reduce loss.
Pretty neat, if it works, and I tend not to bet against Toyota. The other engine is even smaller:
[A] 1.0-liter engine jointly developed with Daihatsu Motor Co., Ltd. has achieved maximum thermal efficiency of 37 percent due to a similar tumble flow-generating intake port, a cooled EGR system, and a high compression ratio. Combination with the idling-stop function and various other fuel consumption reduction technologies allows vehicles to achieve a maximum fuel efficiency improvement of approximately 30 percent over current vehicles.
The 1.3, they say, will reach 38 percent. Most of us out here in the old Teeming Milieu are getting 20 percent, maybe.
Still, there’s one thing I want to know that Toyota for some reason didn’t put in their press release: How many cylinders? Eventually, Cameron Miquelon at TTAC ferreted out the numbers: the bigger engine has four cylinders, the smaller one three. Not entirely unpredictable, perhaps, but you’d think Toyota would be telling us this up front.