Acura RSX: innovation under the hood

The replacement of Acura's Integra, the RSX features a new engine with “intelligent” valve control.

The new Acura RSX is Honda's first U.S. application of an innovative electronic valve timing system, which, with other powertrain features, helps the coupe's 14 achieve achieve peak output of 119 kW (160 hp) at 6500 rpm and peak torque of 191 N·m (141 lb·ft) at 4000 rpm. Rigid, lightweight, and compact, the i-VTEC (“i” for intelligent valve control and VTEC for variable valve timing and lift electronic control) powerplant displaces 2.0 L and employs a dual-stage air intake manifold and four valves per cylinder.

With the i-VTEC system, the all-aluminum engine delivers Acura's goals of increased power and performance, improved fuel efficiency, and decreased exhaust emissions (meets LEV-II standards) compared with the Integra 1.8-L DOHC VTEC engine it replaces, plus reduced maintenance and enhanced driveability. The i-VTEC system combines VTEC technology with an innovative camshaft-phase-control system called VTC (variable timing control). VTC uses a spool valve that directs high-pressure oil to chambers inside the intake cam's drive sprocket, allowing for continuous adjustment of the intake camshaft's phase (position relative to the crankshaft) over a range of ±25° (advance or retard). A separate VTC electronic control unit monitors rpm, camshaft and throttle position, ignition timing, and engine-exhaust conditions to determine the necessary cam-phase adjustments.