California Autos Examiner

Monday, March 09, 2009

GM Explains Direct Injection

I know that some of you may have wondered if I dropped off the face of the earth. The answer is no, I have not, but life has been extremely busy. There's the usual workload plus a home remodel and on top of that there is a little something extra that I can't publicly discuss quite yet ;-)

In any case, ACATT has drawn the short end of the stick as of late and I'm deeply sorry about that. Hopefully I'll be able to dedicate more time to this blog in the near future. I do have a $100 worth of swag to hand out to you, so be on the lookout for that! In the meantime, enjoy this info...

With direct injection, highly pressurized fuel is sprayed directly into the combustion chamber, instead of through the cylinder ports, to create a more complete burn of the fuel-air mixture. Less fuel is required to produce the equivalent horsepower of a conventional port-injection combustion system and the mixture is more precise, which also helps the engine save fuel and start quicker with fewer hydrocarbon emissions. All of this makes for a more complete combustion of the gasoline, providing more power with less fuel.

Direct injection is one of the advanced internal combustion engine technologies that allows manufacturers to downsize from a V8 to a V6, or a V6 to a four-cylinder without sacrificing power, but still improve fuel efficiency with fewer emissions. You can see in the video above how it works.

source: gm fastlane

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