The premier power train for General Motors, or GM, is the Vortec engine. The word "Vortec," according to GM, comes from the word vortex and was first used in GM's 4.3-liter V-6 engine. Its designers created a vortex inside the engine's combustion chamber to improve the mixture of air and fuel in the combustion process. The Vortec engine is designed for power and efficiency. The Vortec family of power trains powers the following GM cars: Buick, Cadillac, Chevrolet, Hummer and GMC. The engine comes in six sizes and powers all of GMs trucks and SUVs. GM is currently manufacturing the fourth generation of Vortec engines.
Vortec 5300 LH6
A fourth-generation Vortec, the Vortec 5300 LH6 is a 5.3-liter V-8 small block truck engine that is produced in four variations; two iron block engines and two aluminum block engines. The LH6 first appeared in 2007 and is rated at 315 hp (horsepower) at 5,200 rpm with 338 ft. lbs. (foot-pounds) of torque at 4,400 rpm for all GM truck applications. This engine is used in the Silverado, GMC Sierra, GMC Envoy and the Chevy Trailblazer. It has a cast iron block with a cast aluminum head. It also has overhead valves (OHV) with two valves per cylinder. It comes with Fuel Active Management, a computer that turns off certain cylinders during cruising situations to conserve fuel and automatically restores all cylinders when the engine comes under load. The engine receives 14 mpg (miles per gallon) in the city and 19 mpg on the highway.
Vortec 6000 L76
A fourth-generation Vortec with a debut in 2007, the L76 HO 6000, or Vortec Max, is the engine's high-output version. The 6.0-liter V-8 engine was originally made for GM trucks. The engine appears in the Chevy Yukon, Suburban, Sierra and Silverado. The L76 features 367 hp at 5,600 rpm, with 375 ft. lbs. of torque. It is an OHV engine with a cast aluminum head and two valves per cylinder. The maximum engine speed stands at 6,000 rpm and it takes regular unleaded fuel. The engine employs Active Fuel Management and receives 14 mpg in the city and 19 mpg on the highway.
The 6200 Vortec L9H
Another fourth-generation Vortec, the 6200 Vortec L9H comes to play with even more power for GM trucks like the Cadillac Escalade, the Silverado 1500 and the GMC Sierra Denali. The engine rates 403 hp at 5,700 rpm with 417 ft. lbs. of torque. The L9H sports variable valve timing, which was a first back in 2007 for a non-overhead cam V-8 engine. The engine employs sequential fuel injection and has the option of using E85 or regular gasoline. This engine receives 13 mpg in the city and 19 on the highway.
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