15 Facts About VTEC

VTEC is a system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine, resulting in higher performance at high RPM, and lower fuel consumption at low RPM.

The VTEC system uses two camshaft profiles and hydraulically selects between profiles.

VTEC system provides the engine with valve timing optimized for both low and high RPM operations.

The primary rocker arm contains the VTEC switching piston, while the secondary rocker arm contains the return spring.

Rather, it refers to the rocker arm which contains the VTEC switching piston and receives oil from the rocker shaft.

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Once VTEC engagement occurs, the oil pressure flowing from the exhaust rocker shaft into the primary exhaust rocker arm forces the VTEC switching piston into the secondary exhaust rocker arm, thereby locking both exhaust rocker arms together.

In newer version of 3-Stage i-VTEC combined VTC and PGM-FI to allow ECU to control full range of mode to archive greater fuel economy improvements and performance.

Honda J-Series Engines using i-VTEC combine SOHC VTEC operation with Honda VCM variable displacement technology to improve fuel economy under light loads.

The performance i-VTEC system is basically the same as the DOHC VTEC system of the B16A's.

Performance i-VTEC is a combination of conventional DOHC VTEC with VTC .

Honda's advanced VTEC technology departs greatly from its previous incarnations by no longer relying on switching between two sets of lobes on a given camshaft.

The "infinitely variable" portion of the A-VTEC is what makes it stand out as a serious evolutionary step in the world of VTEC.

Advanced VTEC has a standard camshaft and rocker arms, attached as they normally are with camshaft overhead, and rocker arms pushing down on the poppet valves.

Apart from the Japanese market-only Honda CB400SF Super Four HYPER VTEC, introduced in 1999, the first worldwide implementation of VTEC technology in a motorcycle occurred with the introduction of Honda's VFR800 sportbike in 2002.

Critics maintain that VTEC adds little to the VFR experience, while increasing the engine's complexity.