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A Honda K24A Engine with i-VTEC. VTEC (described as Variable Valve Timing & Lift Electronic Control, but stands for Valve Timing Electronically Controlled) 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.
Alfa Romeo was the first manufacturer to use a variable valve timing system in production cars (US Patent 4,231,330). [10] The fuel injected models of the 1980 Alfa Romeo Spider 2000 had a mechanical VVT system. The system was engineered by Ing Giampaolo Garcea in the 1970s. [11] All Alfa Romeo Spider models from 1983 onward used electronic VVT ...
Honda wasn't the first or last to do variable valve timing and lift, but no one did it with such style.
Alfa Romeo was the first manufacturer to use a variable valve timing system in production cars (US Patent 4,231,330). The 1980 Alfa Romeo Spider 2.0 L had a mechanical VVT system in SPICA fuel injected cars sold in the US. Later this was also used in the 1983 Alfetta 2.0 Quadrifoglio Oro models as well as other cars.
Three-stage VTEC is a multi-stage implementation of Honda's VTEC and VTEC-E (colloquially known as dual VTEC) technology, implemented in some of the company's D series engines from 1995 to the present day, allowing the engine to achieve both fuel efficiency and power. VTEC-E (for "Efficiency") is a form of VTEC that closes off one intake valve ...
91–96 H22A Prelude Si VTEC (Japan) 94–97 H22A Accord SiR (Japan) 97–01 H22A Prelude SiR, SiR S-spec, Type S (Japan) 00–02 H22A Accord Euro R (Europe) 93–96 H22A1 Prelude VTEC (America) 93–96 H20A4 Modified Prelude VTEC (America) 97–98 H22A1 Prelude VTiR (Australia) 93–96 H22A2 Prelude 2.2i VTEC (Europe) 1996 H22A3 Prelude VTEC (KU)
It is fuel injected, has an aluminum-alloy cylinder block and cylinder head, is a SOHC 16-valve design (four valves per cylinder) and utilizes Honda's i-VTEC system. The R series engine has a compression ratio of 10.5:1, features a " drive by wire " throttle system which is computer controlled to reduce pumping losses and create a smooth torque ...
In an external combustion engine, such as a steam engine, the control of the valve timing is by the valve gear. In a typical piston valve arrangement, the timing of the intake and exhaust events for each cylinder are inextricably related as they are governed by the movement of a single piston uncovering two ports. However, the duration of the ...