General Motors is moving closer toward the holy grail of simultaneous horsepower and efficiency by taking a more direct route. Direct injection works by taking the fuel injectors away from the cylinder head intake ports, and into the combustion chambers. The ability to meter precise amounts of fuel into the chamber at exactly the right time makes for clean cold starts, enables higher compression ratios, improves fuel economy, and can help extract V8-level horsepower numbers out of a V6. GM claims 300 ponies from Cadillac's version of the naturally aspirated, direct injected 3.6-liter V6 engine, currently in pre-production at the GM Flint Engine South plant. While one atmosphere in the chambers is OK, direct injection fuel control also holds the potential for creative use of forced induction setups that still meet cold startup emissions standards. We'll take a directly injected twin-turbo V6 in something light, with rear-wheel drive and a six-speed manual. Hey-yo!

Direct Injection Connection [The Flint Journal]

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