New light-weight 3-liter V6 Toyota engine with high-output torque, good fuel economy and low-exhaust emission levels

摘要

A new generation 3.0-liter V6 engine, the 1MZ-FE, has been developed. Through improvement of the basic technical characteristics of each individual component, the 1MZ-FE has achieved compactness, weight reduction and good fuel economy without adding systems or components. This new engine makes use of an aluminum cylinder block, and compared with the previous V6 engine, significant weight reduction of the crankshaft, connecting rods and pistons was achieved while still maintaining a high level of rigidity. To improve fuel economy, friction loss was reduced substantially by reducing the weight of moving parts and improving the surface roughness of sliding parts. The combustion was also improved through better fuel atomization by the air-assisted fuel injector and modification of the combustion chamber shape. Through these improvements the 1MZ-FE has achieved a weight reduction of approximately 20% and far grater vehicle fuel economy than before. Furthermore, the 1MZ-FE meets EPA Tier 1 exhaust emission regulations, California enhanced evaporative regulations, and U.S. Federal OBD-II requirements. The 1MZ-FE engine is produced in the U.S. and Japan, and is installed in the Camry, Lexus ES300, and Avalon.