GM High Value engine

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GM High Value V6 Engines
ManufacturerGeneral Motors
Production2005–
PredecessorGM 60-Degree V6 engine

The High Value engine family from General Motors is a group of Cam in Block or "Pushrod" V6 engines. They use the same 60° vee bank as the 60° V6 family they are based on, but the new 99 mm bore required offsetting the bores by 1.5 mm away from the engine centerline. These engines (aside from the LX9) are the first cam in block engines to implement Variable Valve Timing, and won the 2006 Breakthrough Award from Popular Mechanics for this innovation. For the model year 2007 the 3900 engine features optional displacement on demand, or what is now called "Active Fuel Management" which can deactivate one bank of cylinders under light load to increase economy. It was rumored GM would produce a 3-valve design, but never came to be. These engines are produced primarily at the GM UAW factory in Tonawanda, New York.

3.5

LX9

The LX9 3500 is an OHV engine based on the 3400 V6. It incorporates electronic throttle control. Bore is 94 mm, stroke is 84 mm for a displacement of 3498 cc (213 cu in). A GM Press Release for the 2004 Malibu described the 3500 thus: "3.5-liter V-6, will debut in the 2004 Chevrolet Malibu. The engine offers improved performance and fuel efficiency, and runs smoother and quieter than earlier generation V-6 engines. The 3500 V-6 features an advanced powertrain control module, improved fuel injection system, a redesigned exhaust manifold and a new catalytic converter contribute to reduced emissions, as well as improved efficiency and performance characteristics. Improvements in cooling, sealing and the accessory drive system add to the engine's overall quality, reliability and durability." Power output ranges from 196 hp (146 kW) to 201 hp (150 kW), torque ranges from 213 lb·ft (289 N·m) to 221 lb·ft (300 N·m). This engine was retired after the 2006 model year, being replaced by the 3.5 L LZ4 V6 for 2007.

It was used in the following vehicles and model years:

LZE

The LZE 3500 is an OHV flexible fuel engine based on the 3.9 L LZ9 V6 (it can use either plain gasoline or 85% Ethanol, E85) and includes continuously variable cam timing (fixed overlap). It has a cast iron block and aluminum heads. Bore is 99 mm, stroke is 76 mm for a displacement of 3510 cc (214 cu in). Output is 211 hp (156.5 kW) at 5800 rpm and 214 ft·lbf (298 N·m) at 4000 rpm.

Output for model year 2007 is upped to horsepower of 224 @ 5800 rpm and torque of 220 @ 4000 rpm.

Applications:

LZ4

The LZ4 3500 is an OHV engine based on the 3.9 L LZ9 V6. It was introduced for the 2006 model year in the Chevrolet Impala and Monte Carlo. It includes continuously variable cam timing (fixed overlap). It has a cast iron block and aluminum heads. Output is 211 hp (156.5 kW) at 5800 rpm and 214 ft·lbf (298 N·m) at 4000 rpm. Bore is 99 mm, stroke is 76 mm for a displacement of 3510 cc. Horsepower rating changed for the 2007 model year to Horsepower: 224 @ 5800 rpm and Torque: 220 @ 4000 rpm. The Chevrolet Malibu, Pontiac G6, and Saturn Aura are to be equipped with this engine for 2007 (previously the Malibu and G6 had the non-VVT 201 hp (150 kW) 3.5 L LX9).

Applications:


Note: GM often refers to this engine in its literature as a "3.5L V6 with Variable Valve Timing".

3.9

Bore is increased to 99 mm (3.9 in) and stroke is increased to 84 mm (3.31 in) for a displacement of 3880 cc (237 cu in).

LZ9

The new LZ9 3900 features Variable Cam Timing, a new feature on a pushrod engine, roller rocker arms and has a variable resonance intake manifold. It produces 240 hp (179 kW) and 240 ft·lbf (332 Nm) torque, with a wide torque curve. 90% of the torque is available from 1500rpm to 5500rpm.

Applications:

LZ8

The LZ8 3900 has the same Variable Cam Timing technology as the LZ9. The 2007 model year introduces the Active Fuel Management system (formerly known as Displacement on Demand), which can turn off a bank of cylinders under a light load for increased fuel economy. Output is slightly lower than the LZ9 at 233 hp (174 kW) and 240 ft·lbf (332 N·m).

This engine is used in the following vehicles:

LGD

The LGD 3900 is a flexible fuel version of the LZ9, and like its 3.5 L counterpart the LZE, it can run on E85, pure gasoline or any mixture of the two. It is currently only available on GM's "Crossover Sport Vans". Output is identical to the LZ9.

LZG

The LZG 3900 is a flexible fuel version of the LZ9 that replaces the LZ8 in the Chevrolet Impala. It keeps the Active Fuel Management system introduced on that engine and produces a nearly-identical 233 hp (174 kW) and 240 ft·lbf (325 N·m).

See also

External links