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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.
VTEC-E (economy) was designed to achieve better fuel economy, at the cost of performance. The engine operates in "12-valve mode", where one intake valve per cylinder in the 16-valve engine remains mostly closed to attain lean burn. The lean burn mode gets the air to fuel ratio above the 14.7:1 stoichiometric ratio and thus enables extra fuel ...
In mathematics, a solenoid is a compact connected topological space (i.e. a continuum) that may be obtained as the inverse limit of an inverse system of topological ...
Engine displacement ranges between 1.2 and 1.7 liters. The D Series engine is either SOHC or DOHC , and might include VTEC variable valve lift. Power ranges from 66 PS (49 kW) in the Logo to 130 PS (96 kW) in the Civic Si.
The formula below is valid for a spool valve when the spool is steady. [1] Concentric spool/valve housing position i.e. the height/radial clearance c is the same all around: Units as per SI conventions : Flow Q i = (∆P · π · d · c 3) ÷ (12 · ν · ρ · L) where: Q = volumetric flow rate (m^3/sec) ΔP = P1-P2 = pressure drop over the ...
Similarly, if the valve is closed when the solenoid is not energized, then the valve is termed normally closed (N.C.). [1] There are also 3-way and more complicated designs. [2] A 3-way valve has 3 ports; it connects one port to either of the two other ports (typically a supply port and an exhaust port).
The servo valves of the World War II-era were similar to this — using a solenoid to drive a spool valve. Advancement of EHSVs took off in the 1950s, largely due to the adoption of permanent magnet torque motors as the first stage (as opposed to solenoids).
The J30A4 pushed output to 242 hp (180 kW) and 212 lb⋅ft (287 N⋅m) using a three-way VTEC system, a higher (10.0:1) compression ratio and a novel exhaust manifold cast as one piece with the cylinder head. It weighs nearly 20 lb (9.1 kg) less and is an inch shorter than J30A1.
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