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The LA engines are a family of pushrod OHV 90° V-configured gasoline engines built by Chrysler Corporation. It was factory-installed in passenger vehicles, trucks and vans, commercial vehicles, marine and industrial applications from 1964½ through 2003. The combustion chambers are wedge-shaped, rather than the polyspherical combustion chambers in the predecessor ''A engine'' or the hemispherical chambers in the Chrysler Hemi engine. All versions are made of cast iron, except for the Viper V10 which is aluminum. LA engines have the same bore spacing as the A engines. LA engines were made at Chrysler's Mound Road Engine plant in Detroit, Michigan as well as plants in Canada and Mexico. The "LA" stands for "Light A", as the older "A" engine it was closely based on was nearly 50 pounds heavier.〔(Mopar LA Engines )〕 Willem Weertman, who later became Chief Engineer – Engine Design and Development, was in charge of the conversion.〔()〕 The basic design of the LA engine would go unchanged through the development of the "Magnum" upgrade (1992-'93) and into the 21st Century, although the finer details were changed to create a more powerful, efficient, and modern powerplant.〔 ==273 V8== The 273 (4.5 L) was the first LA engine, mid-1964 and offered through 1969, rated at 180 BHP. It had a 3.625 in (92 mm) bore and 3.31 in (84 mm) stroke. It had a mechanical solid lifter valvetrain until 1968 when hydraulic lifters were introduced; hydraulic lifters generally make for a quieter valvetrain. The reciprocating assembly included a cast or forged steel crankshaft, drop forged steel connecting rods and cast aluminum pistons. The valvetrain consisted of a cast nodular iron camshaft, solid or hydraulic lifters, solid pushrods and shaft-mounted, malleable iron rocker arms (stamped steel on later hydraulic-cam engines). These actuated the overhead steel intake and exhaust valves. The cylinder heads featured wedge-shaped combustion chambers with a single intake and a single exhaust valve for each cylinder. Spark plugs were located in the side of the cylinder head, between the exhaust ports.〔 A high performance was offered 1965-'67, this was standard in the Barracuda Formula S model and optional in all other compact models exc. station wagons. It featured a 4-BBl carburetor and matching intake manifold, chrome unsilenced air cleaner with callout sticker, longer-duration and higher-lift camshaft and stronger valve springs, 10.5:1 compression ratio, special black wrinkle valve covers with cast aluminum appliques, and a low-restriction exhaust system with a 2.5" exhaust pipe, collector-type Y-junction, and exposed resonator. In 1965 (only) the muffler was of "straight through" construction. A special version was also available in 1966 only - it used a lift solid-lifter camshaft, fabricated-steel-tube exhaust, and a Holley 4-barrel carburetor, producing 275 horsepower (1 hp/cu in). It was available in the Dodge Dart only, and the car so equipped was called the "D-Dart", a reference to its classification in NHRA D-stock for drag racing, which was the car's only intended purpose. * 1964–1968 Dodge Dart * 1964–1968 Plymouth Barracuda * Plymouth Belvedere * Dodge Coronet * Plymouth Satellite * 1964–1968 Plymouth Valiant * 1966–1967 Ghia 450 SS 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「Chrysler LA engine」の詳細全文を読む スポンサード リンク
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