New Chevy Ecotec engine for Mustang II?

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Well-Known Member
Dec 25, 2015
Earth USA East Coast
A lot of times, modern engines with high (geometric) compression ratios use the Atkinson cycle, which means that they keep the intake valve open long enough so that the compression doesn't start until after the piston has moved significantly into the compression stroke. If you use this with a carburetor, you're going to pump raw gas back out of the cylinder: a DI engine can delay the fuel injection until after the valve closes; a carburetor can't.

The Chevy Ecotec may be one of the engines that do this; use of the Atkinson cycle (or the related Miller cycle) is common in engines used for hybrids, and a model of the Ecotec is the engine GM uses in the Volt and its hybrids.