Toyota has unveiled two brand-new petrol engines; employing technology from its current range of hybrids. The company says the new engines will deliver fuel savings of up to 30 percent.
While the new powerplants may be hybrid engines without the electric motor attached, it’s worth noting that neither is turbocharged.
The first new engine is a 1.0 litre unit jointly developed with Daihatsu. Toyota says it combines a high compression ratio and a “tumble flow-generating intake port” to achieve a maximum thermal efficiency of 37 percent.
Fitted with a stop-start function, the new engine could be up to 30 percent more fuel-efficient than current engines of a similar capacity.
The second new engine is a 1.3 litre unit featuring Atkinson cycle combustion, as used by Toyota in its numerous hybrid models.
Thermal efficiency is again the main aim for the new unit, which achieves a maximum thermal efficiency of 38 percent.
The same tumble flow-generating intake port is used from the 1.0 litre engine, along with cooled exhaust gas recirculation, a 13.5:1 compression ratio and ‘intelligent electric’ variable valve timing.
Toyota says the new 1.3 litre unit can improve fuel consumption over current 1.3 litre engines by up to 15 percent.
A report with industry paper Automotive News last year pointed to Toyota’s continual focus on large naturally aspirated petrol engines, rather than follow the industry trend to smaller, turbocharged units.
While the 1.0 and 1.3 litre engines are anything but large, drivetrain boss Koei Saga said the Atkinson cycle would feature in future engine designs by Toyota.
Expect to see the new engines accompanying various model upgrades soon, with 14 variations of the new units set to be introduced globally by 2015.