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The 1ZZ-FE engine is a newly developed in-line 4-cylinder, 1.8-liter, DOHC 4-valve engine mounted in the new Corolla. Abounding in new technologies including the laser-clad valve seat, high-pressure die-cast aluminum cylinder block, and the small-pitch chain drive DOHC, coupled with the fundamentally reviewed basic specifications, the new engine is compact and lightweight, offering high performance and good fuel economy. Anticipating even more stringent emission regulations in the future, in addition to the revision of the engine body, the layout of the exhaust system has been improved to enhance warm-up performance of the converter.

Toyota has introdued new 4-valve engine series as the standard engines. And recently major improvements have been added to this series to provide new features as the second generation engine. For 4A-FE, 1.6 ℓ, water-cooled 4-cylinder engine, in order to increase performance over the entire speed range and the fuel economy, those are often contrary to each other, the cylinder head port, the clooling system, and the piston are improved, and the knock control system is adopted. And also the idle speed control system, the evaporative emission control system and fuel control are improved for higher fuel economy. And in order to reduce vibration and noise, forged crankhsaft, large aluminum stiffner and cylinder-like hydraulic engine mount are adopted. In this paper, Details of such improvement will be introduced.