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1.8L DOHC Ecotec I4

1.8L (LUW) -- Intake Manifold


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138HP | 123lbft 1.8L DOHC Ecotec I4


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Old 09-09-2011, 12:49 PM   #1
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Default 1.8L (LUW) -- Intake Manifold

The 1.8L (LUW) engine uses a 2-stage intake "resonator" manifold.

From the GM literature:

"The Ecotec 1.8L’s two-stage variable intake manifold optimizes fuel economy and performance. At engine speeds below 4,000 rpm, inlet air passes through 35.8-inch-long (910 mm) intake tracts that help increase torque. At speeds greater than 4,000 rpm, a rotary sleeve within the lightweight composite intake manifold closes off the full length of the intake tracts, forcing air through a shorter, 10.2-inch (260 mm) path that helps build horsepower."

Summary:

below 4,000 rpm = 35.8" (910mm) intake tract...for torque.
above 4,000 rpm = 10.2" (260mm) intake tract...for horsepower.
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