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The Mazda K-series automobile engine is a short stroke, 60° V6 24-valve with belt-driven DOHC and an all-alloy construction. Their displacements range from 1.8 L to 2.5 L. They all use a 27-degree DOHC valvetrain with directly actuated hydraulic (HLA) bucket lifters. The K-series also feature a highly-rigid, aluminum split-crankcase engine block design with 4-bolt mains with additional bolts securing the lower block, an internally balanced forged steel crankshaft with lightweight powder forged carbon steel connecting rods. They were designed with the intent of being as compact as possible for short-hood front-wheel drive applications. One unique innovation of the K-series was the introduction of Variable Resonance Induction System (VRIS). Based on the Helmholtz resonance principle, the intake manifold is equipped with 3 chambers tuned to a specific resonant frequency. The computer dynamically switches between each resonant chamber to achieve the appropriate resonant frequency for the engine's rpm. This effect optimizes volumetric efficiency over a given rpm range to provide maximum torque over the entire rpm range. VRIS is used on the K8, KF, and KL but nearly all modern V6 engines are now using this technology. The K-series all have a 7,000 rpm redline with 7500-7800 rpm limiter, which given the engine design is conservative. The KJ-ZEM Miller cycle engine had a 6,000 rpm redline, but was only available with an automatic transmission. ==K8== The 1.8 L (1845 cc) K8 is among the smallest production V6 engines ever; and also the first K-series engine to be used in a Mazda car (in the Mazda MX-3). It was a DOHC 4-valve design with VRIS and a bore and stroke. It produced in US trim (sometimes referred to as "K8-DE"), and in Japanese trim (the "K8-ZE") on introduction in 1991 and 144 hp (108 kW) and 115 lb·ft (157 Nm) at its best. Applications: * Mazda MX-3 * Eunos 500 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mazda K engine」の詳細全文を読む スポンサード リンク
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