GM High Value engine


The High Value engine family from General Motors is a group of Cam in Block or "Overhead valve" V6 engines. They use the same 60° vee bank as the 60° V6 family they are based on, but the new bore required offsetting the bores by away from the engine centerline. These engines 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 2007 model year, the 3900 engine features optional displacement on demand or "Active Fuel Management" which deactivates a bank of cylinders under light load to increase highway fuel economy. It was rumored GM would produce a 3-valve design, but that never came to be. These engines were produced primarily at the GM factory in Tonawanda, New York and at the Ramos Arizpe engine plant in Mexico. The assembly line for this engine was manufactured by at their powertrain facility in Kumamoto, Japan.
As of the 2012 model year, GM no longer sells these motors in any US market vehicles.

3.5

LX9

The LX9 3500 is an OHV engine based on the 3400 V6. It incorporates electronic throttle control. Bore and stroke is, for a displacement of. A GM Press Release for the 2004 Malibu described the 3500 thus: "3.5L V6, will debut in the 2004 Chevrolet Malibu. The engine offers improved performance and fuel efficiency, and runs smoother and quieter than earlier generation V6 engines. The 3500 V6 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 to, torque ranges from to.
It was used in the following vehicles and model years:
The LZ4 3500 is an OHV engine that uses a similar block as the 3.9L LZ9 V6. It was introduced for the 2006 model year and Monte Carlo. Bore is the same, but the stroke is reduced to for a displacement of. It includes continuously variable cam timing. It has a cast iron block and aluminum heads. Output is at 5800 rpm and at 4000 rpm. Horsepower rating changed for the 2007 model year to at 5800 rpm and torque at 4000 rpm. The Chevrolet Malibu, Pontiac G6, and Saturn Aura became equipped with this engine for 2007. In 2008 SAE ratings dropped the horsepower ratings to, keeping torque as is. On Pontiac G6 convertible models, horsepower was rated at.
Applications:
Note: GM often refers to this engine in its literature as a "3.5L V6 with Variable Valve Timing".

LZE

The LZE 3500 is an OHV flexible fuel engine based on the 3.5L LZ4 V6 and includes continuously variable cam timing. It has a cast iron block and aluminum heads. Bore and stroke is, for a displacement of. Output is at 5800 rpm and at 4000 rpm.
Applications:
Bore and stroke is for a displacement of.

LZ9

The new LZ9 3900 features Variable Cam Timing, a new feature on a pushrod engine, roller rocker arms and has a variable length intake manifold. A computer controlled plenum divider that, along with the VVT cam function, improves efficiency across a broader RPM range.
It produces and torque, with a wide torque curve. 90% of the torque is available from 1500 rpm to 5500 rpm.
Applications:
The LZ8 3900 has the same Variable Cam Timing technology as the LZ9. The 2007 model year introduces the Active Fuel Management system, which can turn off a bank of cylinders under a light load for increased fuel economy. Output is slightly lower than the LZ9 at and.
This engine is used in the following vehicles:
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. Output is identical to the LZ9.
The LZG 3900 is a flexible fuel version of the LZ8 that replaces the LZ8 in the Chevrolet Impala. It keeps the Active Fuel Management system introduced on that engine and produces a nearly identical and.