The 2012 Civic Si is powered by a new 2.4-liter inline 4-cylinder engine that is the largest and most powerful of any Civic introduced in the United States. The dual overhead cam (DOHC) engine is an all-aluminum design that uses four valves per cylinder (16 valves total), a high-performance version of the i-VTEC® system and a specially tuned high-volume intake manifold.
The Civic Si produces 201 horsepower – up four horsepower from the 2.0-liter engine it replaces. The i-VTEC® “intelligent” valve-control system, new friction-reducing technologies and extensive weight control measures helps the Civic Si deliver exhilarating acceleration, improved fuel economy and low exhaust emissions.
The new larger displacement engine in the Civic Si delivers peak power at a more accessible 7000 rpm compared to the previous Si engine’s 7800 rpm power peak. The engine’s increased displacement results in a substantial 22-percent increase in peak torque. The new 170 lb-ft rating occurs at just 4400 rpm, 1700 rpm lower than the previous engine’s 139 lb-ft at 6100 rpm.
Even with its increase in displacement, horsepower and torque, the 2012 Civic Si has an estimated EPA city rating of 22 mpg (up 1 mpg compared to the 2011 Civic Si) and increases highway fuel economy with a rating of 31 mpg (up 2 mpg compared to the 2011 Civic Si). In addition, the Civic Si engine meets strict Ultra-Low Emission Vehicle (ULEV-2) emissions standards.
The Honda Civic Si is available exclusively with a 6-speed manual transmission with a short-throw shifter. Designed to be compact and lightweight, the 6-speed has also been engineered to provide quick and precise shift action. The Civic Si also includes a clutch with a torsion mechanism that enhances refinement in terms of engagement and feel.
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