Wednesday, May 13, 2009

Chrysler LA engine


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The LA engines are a family of pushrod OHV 90 V-block gasoline engines built by Chrysler Corporation and factory-installed in passenger vehicles, trucks and vans, commercial vehicles, marine and industrial applications from 1964 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 are cast iron, except for the Viper V10, which is aluminum. LA engines have the same 4.46-inch (113mm) 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.

Contents

1 273 V8

2 318 V8

3 340 V8

4 360 V8

5 239 V6

6 Magnum engines

6.1 Magnum 5.2

6.2 Magnum 5.9

6.3 Magnum 3.9

7 8.0 Viper V10

8 Magnum V10

9 See also


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273 V8

The 273 (4.5L) was the first LA engine, introduced in 1964 and offered through 1969, rated at 180 BHp. It had a 3.625in (92mm) bore and 3.31in (84mm) stroke. It had a mechanical solid lifter valvetrain until 1968 when hydraulic lifters were introduced. A special version was also available in 1966 only - it used a 0.500-inch (12.7mm) lift solid-lifter camshaft, fabricated-steel-tube exhaust, and a Holley 4-barrel carburetor, producing 275 horsepower (1 hp/cuin). It was available in the Dodge Dart only, and the car so equipped was called the "D-Dart". A 235hp (175kW) version with a less aggressive camshaft and without the tube headers was available on regular production Darts, Valiants, and Barracudas from 1965 to '67, it was standard only in the Barracuda Formula S model.

Vehicles using the 273

1964-1968 Dodge Dart

1964-1968 Plymouth Barracuda

Plymouth Belvedere

Dodge Coronet

Plymouth Satellite

1964-1968 Plymouth Valiant

318 V8

The LA 318 was a 318cuin (5.2L) relative of the A 318. Like the A 318, it has a larger bore at 3.91in (99mm) as well as a stroke of 3.31in (84mm). It appeared shortly after the 273, in 1967, and proved tremendously successful. A version of this engine was available until 1991 when its was superseded by the Magnum version (See below). It used hydraulic lifters and a two barrel carburetor for most of its production, though four-barrel Carter Thermo-Quad and Rochester Quadrajet carburetors were used in police applications starting in 1978. The 318 received roller lifters and a fast-burn cylinder head in 1985, and throttle-body electronic fuel injection for truck applications starting in 1988.

Vehicles using the 318

1984-1989 Chrysler Fifth Avenue

1968-1981 Chrysler Valiant

1977-1981 Chrysler LeBaron

1975-1983 Chrysler Cordoba

Dodge Challenger

Dodge Coronet

1968-1976 Dodge Dart

1977-1989 Dodge Diplomat

1991-1999 Dodge Dakota

1976-1980 Dodge Aspen

1971-1972 Dodge Demon

1973-1976 Dodge Dart Sport

1967-1991 Dodge Ram

Dodge Ramcharger

Dodge Ram Van

Dodge Mirada

Plymouth Fury

1968-1976 Plymouth Valiant

Plymouth Satellite

1972-1989 Plymouth Gran Fury

Plymouth Belvedere

1976-1980 Plymouth Volar

1968-1974 Plymouth Barracuda

1970-1980 Plymouth Duster

340 V8

As the Detroit power wars heated up in the mid-1960s, Chrysler decided to produce a small block V8 specifically designed for high performance applications. The goal was to have a lightweight, high output engine equally suited for the drag strip or an oval track[citation needed]. The result of this decision was the 340cuin V8. Chrysler's engineers increased the 318's cylinder bores to 4.04-inch (103mm) while keeping the 318's 3.31-inch (84mm) stroke. Anticipating higher loads resulting from racing operation, the engineers fitted a forged steel crankshaft instead of the cast nodular iron unit used in the 318. A 4-barrel carburetor was mated to a high-rise, dual plane intake manifold. This induction setup fed into a set of cylinder heads that are still considered[who?] one of the best of that era. The heads were high-flow items with big ports, and used 2.02-inch (51mm) intake and 1.60-inch (41mm) exhaust valves. An aggressive cam[vague] was fitted to take advantage of the much better breathing top end. 1968 4-Speed cars got an even hotter cam, but it was discontinued in 1969[citation needed]. The engine was equipped with hydraulic lifters[citation needed]. Power output was officially stated as 275hp (205kW) for the 4 barrel and 290hp (216kW) for the 6-pack version with triple 2-barrel carburetors. Using flat-top pistons, the 340's compression ratio was 10.5:1, placing it near the limit of what was possible on pump gas[citation needed]. The 340 also used heavy-duty parts such as a dual timing chain, windage tray and revised[vague] oil pump[citation...(and so on)
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