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Direct injection has enabled fuel efficiency improvements on the Buick Enclave, LaCrosse, Regal, and the upcoming Verano – without sacrificing performance and still meeting the world’s most stringent emissions requirements. Here’s how...
When “skipping a step” saves you money
In most standard gasoline engines, port fuel injectors spray gasoline into the engine’s air intake manifold. There, the fuel mixes with air in a fine mist before being sucked into a cylinder chamber through the cylinder’s intake valve.
In a direct injection engine, such as the 2.0-litre Ecotec® Turbo in the Buick Regal and Regal GS, this step is “skipped.” Instead, high-pressure direct injectors deliver fuel directly to the point of combustion in the cylinder. Unlike a port injection engine, in a direct injection engine fuel isn’t left behind on manifold walls to evaporate.
Direct injection gives you greater fuel efficiency...
Since residual fuel isn’t left in the air intake manifold, direct injection results in a better delivery system that results in greater fuel efficiency.
According to Ecotec® chief engineer Mike Anderson, “The 2,200 pounds per square inch of pressure that feeds the injectors provides a more atomized and precisely metered fuel spray to each cylinder before every combustion event.”
In addition, “spraying fuel directly into the combustion chamber,” says Anderson, “reduces the temperature of the compressed mixture as the fuel evaporates, which enables a higher-compression ratio, allows for more spark advance, and reduces fuel consumption. The beefier low-end torque and improved drivability of the direct-injected 2.0L turbo [in the Buick Regal and Regal GS] make it a no-compromise, high-efficiency substitute for a bigger and heavier V6.”
...and lower emissions
Direct injection engines also warm up faster, thanks to the ability to add a second injection pulse right before the spark plug ignites the fuel following a cold start. This faster warm-up can cut emissions of unburned hydrocarbons by up to 25 per cent.
Buick is the only domestic brand powered exclusively by direct injected engines, and the 2.0-litre Ecotec® Turbos are the most powerful and efficient four cylinder engines GM builds today.
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