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The F20C was designed with high engine speed capability in mind, for increased power output; the rev limit is 9,000 rpm, with VTEC engagement at 6,000 rpm. Its relatively long stroke of 84 mm results in a mean piston speed of 4,965 ft/m, or 25.2 m/s, which was higher than any other production car to date. [ 4 ]
The trade-off was that Honda's SOHC engines benefited from the VTEC mechanism only on the intake valves. This is because VTEC requires a third center rocker arm and cam lobe (for each intake and exhaust side), and, in the SOHC engine, the spark plugs are situated between the two exhaust rocker arms, leaving no room for the VTEC rocker arm ...
A rocker arm is a valvetrain component that typically transfers the motion of a pushrod in an overhead valve internal combustion engine to the corresponding intake/exhaust valve. Rocker arms in automobiles are typically made from stamped steel, or aluminum in higher-revving applications.
Low-friction, roller-bearing rocker arms are used to help reduce friction and improve engine efficiency, except the secondary intake valve rocker arm does not have a roller-bearing. At high speed, as calculated by the ECU based on several inputs, a VTEC oil control valve is energized and oil pressure is routed to the small piston train in each ...
The VTEC cylinder idling system of the engine closes the valves in three of the four cylinders when the car is decelerating, reduces the power lost to the engine by 50%, and allows the IMA to extract more electrical energy during braking. The rocker arms operating the intake and exhaust valves have two modes: valve-lift mode or idle mode.
The first VTEC solenoid is opened and directs the oil to the sliding pin that connects the rocker arms of the intake valves with the first intake valve's lobe. Thus, all two intake valves move at the normal profile of that lobe. The engine's performance is usual to the non-VTEC engines. This mode is suitable for mid-range RPMs.