SIR: SIR stands for "Sport Injected Roadster." It is a designation used by Honda for its sportier vehicles.
DOHC: DOHC stands for "Dual Overhead Camshaft." This refers to the engine's valvetrain configuration, which uses two camshafts located at the top of the cylinder head to control the opening and closing of the intake and exhaust valves.
VTEC: VTEC stands for "Variable Valve Timing and Lift Electronic Control." It is Honda's proprietary technology that alters the timing and duration of valve operation based on engine speed and load. This allows for increased engine performance and efficiency across a wide range of operating conditions.
In summary, "SIR DOHC VTEC" indicates a high-performance engine found in selected Honda vehicles that features dual overhead camshafts and Honda's VTEC technology.
