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The first patent issued for a variable length intake manifold was published in 1958, US Patent US2835235 by Daimler Benz AG. [1] There are two main effects of variable intake geometry: Swirl Variable geometry can create a beneficial air swirl pattern, or turbulence in the combustion chamber.
An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinders. [1] The word manifold comes from the Old English word manigfeald (from the Anglo-Saxon manig [many] and feald [repeatedly]) and refers to the multiplying of one (pipe) into many.
The Honda R engine is an inline-four engine launched in 2006 for the Honda Civic (non-Si). 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.
Intake manifold vacuum is applied to the crankcase via the PCV valve. The airflow through the crankcase and engine interior sweeps away combustion byproduct gases. This mixture of air and crankcase gases then exits, often via another simple baffle, screen, or mesh to exclude oil mist, through the PCV valve and into the intake manifold. On some ...
The air which is expelled fills the manifold with higher pressure, and on subsequent intake strokes the air which is taken in is at a higher pressure. Late intake valve closing has been shown to reduce pumping losses by 40% during partial load conditions, and to decrease nitric oxide emissions by 24%. Peak engine torque showed only a 1% decline ...
The D14A3 and D14A4 engines are identical, the difference is the addition of a small gasket under the throttle body in the D14A3 which restricts the air intake of the engine, lowering the power output. This was done in some European countries to suit local insurance categories.
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