The 2008 Civic Si is powered by a 2.0-liter inline-4 engine, code-named K20Z3, with i-VTEC, delivering about 197 horsepower and 139 lb-ft of torque, paired with a 6-speed manual.
Beyond this quick answer, the engine belongs to Honda’s K-series family, featuring a DOHC, 16-valve layout and variable valve timing. It’s a high-revving, naturally aspirated powerplant designed to maximize performance in a compact sedan, a hallmark of the Si variant within the Civic lineup.
Engine specifications at a glance
Here is a concise breakdown of the engine’s core specs as used in the 2008 Civic Si.
- Engine code: K20Z3
- Displacement: 2.0 liters (1,998 cc)
- Configuration: Inline-4, naturally aspirated
- Valvetrain: DOHC with i-VTEC (intake-side VTEC)
- Power output: 197 hp at 7,800 rpm
- Torque: 139 lb-ft at 6,000 rpm
- Transmission: 6-speed manual
- Redline: around 8,000 rpm
These figures reflect the U.S.-specification for the 2008 Civic Si, underscoring a high-revving, performance-focused engine that defined the Si’s driving character.
Engineering highlights
High-revving performance and i-VTEC
The K20Z3 is a high-revving, normally aspirated four-cylinder designed to deliver peak power in the upper RPM range. It pairs Honda’s i-VTEC variable valve timing and lift system with a lightweight, rigid block to sustain performance at high RPM, which is central to the Civic Si’s sporty identity.
Summary
In the 2008 Honda Civic Si, Honda used the 2.0-liter K-series engine—K20Z3—an i-VTEC inline-4 producing roughly 197 horsepower and 139 lb-ft of torque, paired with a six-speed manual. The powerplant is renowned for its responsiveness, rev-happy character, and role in defining the Si’s sporty personality within the Civic family.