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Topic: Variable intake

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Variable Length Intake Manifold

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	Mazda6Tech - Exploring Mazda's Intake Technology
		The variable intake timing gained 10% more torque across more the lower half of the rev range until the VVT reaches full retard at 6000rpm (which is where the blue line meets the red line).
		The resin intake manifold that Mazda used to create their 2.3l engine has a valve that changes the volume of the intake runner pipes, changing the resonance frequency of the intake inertial charge.
		Intake charge speed is less of an issue on valves that do not open very much, but recall that Mazda's VVT does not vary valve lift.
	www.mazda6tech.com /index.php?option=com_content&task=view&id=14&Itemid=1 (1567 words)

	Unthrottled engine operation with a heated air cycle - Patent 5996560
		Variable control of both the intake and exhaust events is used to assure that the engine cylinder is partially filled with exhaust gas at light loads with only the remaining portion of the cylinder volume available for the intake air.
		In this case, mixing the intake air with substantial amounts of exhaust gas as proposed by Pischinger increases the mean temperature of the gas in the cylinder and, therefore, avoids a reduction in compression ratio and low compression end temperature, which is normally associated with late or early intake valve closing.
		When variable early intake valve closing is applied during the intake stroke, the compression end temperature is still reduced because, subsequent to the closing during the later part of the intake stroke, the cylinder charge is subject to adiabatic expansion.
	www.freepatentsonline.com /5996560.html (3105 words)

	2002 Ford Focus SVT
		Intake and exhaust valve springs are stiffer by 27 percent and 19 percent, respectively, compared with the Zetec I-4’s.
		The intake camshaft is equipped with an electro-mechanical control mechanism, which allows the cam’s maximum opening point, relative to crankshaft degrees, to be varied between 85 and 145 degrees after top-dead-center on the intake stroke.
		The variability is dependent on engine speed and load, and is accomplished by changing oil pressure on either side of a piston in a helix between the cam and its drive pulley.
	www.escortfocus.com /html/ford_focus_svt.html (1606 words)

	BMWNation > Articles
		The fully variable intake manifold is the first system in the world able to adjust the length of the manifolds infinitely to engine speed by way of a separate adjustment mechanism.
		Intake air from inside the drum is able to enter the intake manifold through a recess in the rotor ring, the effective length of the intake manifold changing with the position of this opening.
		On account of this configuration, manifold length is shortest when the intake funnel connects directly to the intake duct, rotation of the ring around its central axis varying the length of the intake duct from 231 mm (9.1") to 673 mm (26.5").
	www.bmwnation.com /articles/e65_new7_2_02.html (3132 words)

	Feature Article - Hot 6 - 05/04
		Variable camshaft timing on both the intake and exhaust cams rotate the cams between the adjustment extremes in a stepless fashion.
		The intake manifold has a pair of intertwined helical elements that are rotated by a servo motor to seamlessly vary the effective length of the intake passage.
		Variable ratio ZF Servotronic steering from the 7 Series also is standard, while its active steering system is available as part of the optional sport package.
	www.autofieldguide.com /articles/050402.html (797 words)

	[No title]
		The intake manifold is a buffer between the engine and the mandatory restrictor.
		When the intake valve shuts abruptly, the air in the runner continues to move down the runner, creating a high-pressure area on top of the intake valve.
		While the occurrence of these resonances can be predicted with a good deal of accuracy, the actual size of the peaks in terms of the highest torque attained and the increase in area under the torque curve are very difficult to predict as is the effect of plenum volume on the resonance peaks.
	www.mne.psu.edu /me415/fall05/SAE/intake.html (854 words)

	Landfills and Water Quality Management
		The magnitude of these variations is dependent on the degree of eutrophication of the lake and season of the year.
		The variability at the 8 meter depth are believed to be due to a thin layer of photosynthetic organisms that vary in depth in a wave-like manner.
		Variations in temperature observed in the studies of Mortimer would be of importance in terms of water treatment since these changes would require continuous adjustment of chemical doses to achieve uniform finished water quality, at a minimum of cost.
	www.gfredlee.com /intake.html (3207 words)

	Variable Length Intake Manifold - Wikipedia, the free encyclopedia
		At low rpm, the speed of the airflow is increased by directing the air through a longer path with limited capacity (i.e., cross-sectional area), but the shorter and larger path opens when the load increases so that a greater amount of air can enter the chamber.
		Ford DSI (Dual-Stage Intake) - on their Duratec 2.5 and 3.0 liter V6s, 2.0 liter Zetec four, and it was also found on the Yamaha V6 in the Taurus SHO.
		Mazda VICS (Variable Intake Control System) is used in the Mazda B engine family of straight-4, and VRIS (Variable Resistance Induction System) in the Mazda K engine family of V6 engines.
	en.wikipedia.org /wiki/Variable_Length_Intake_Manifold (468 words)

	Technical Mysteries Unraveled
		Variable intake manifolding is increasingly more popular since the mid-90s.
		Variable intake manifolds introduce one or two more stages to deal with different engine speeds.
		Variable length intake manifolds is commonly used in saloons.
	www.ukcar.com /features/tech/Engine/turbo/vario.htm (850 words)

	Extractable, variable intake/purification device in a cook top - Patent 5231972
		An extractable, variable intake/purification device in a cook top according to the present invention is provided in a base support framework 11 having support surface 12 and a plurality of burners 13, which may be gas-fired, electrical, or of various kinds.
		Inside the support surfaces 12, at a middle portion of the framework 11 an intake element or mouth 14 is provided, which is oriented in a transverse relative to the burners, and is connected, through a channel 15, with an underlying suction means 16 also contained inside the framework 11.
		In particular, the intake mouth is constituted by a drawer element 17 of prismatic form with a rectangular cross-section extending in transverse said transversal direction.
	www.freepatentsonline.com /5231972.html (934 words)

	Online Encyclopedia and Dictionary - Variable Length Intake Manifold
		As the name implies, VLIM can vary the length of the intake tract of an engine in order to optimize power and torque.
		Ford DSI (Dual-Stage Intake) - on their Duratec 3.0 liter V6, 2.0 liter Zetec four, and it was also found on the Yamaha V6 in the Taurus SHO.
		Mazda VICS (Variable Intake Control System) is used in the Mazda B engine family of straight-4 and Mazda K engine family of V6 engines.
	fact-archive.com /encyclopedia/Variable_Resonance_Induction_System (195 words)

	The WRX engine
		While we might want to say this is because of the variable valve timing, in fact the presence of variable valve timing and the improved drivability is directly attributable to the difference in the fuel the engine is being fed and also the effects of the stringent emissions and fuel economy regulations in the US.
		A variable intake cam timing engine can use a bit more intake/exhaust valve overlap in the low rpm regions for better off boost throttle response and then close down the overlap and at the same time extend intake closing time, which lets the cylinder fill better for more power.
		I would have hoped Subaru would have used variable valve timing to help achieve emissions and mileage goals, but motors tend generally to detonate in the 3000-4000 rpm region where the cylinder pressures are highest and variable valve timing does no really help this problem.
	www.spdusa.com /driving_the_wrx_engine.htm (1002 words)

	[No title]
		Adoption programs can also increase intake by increasing the population of animals that may later be relinquished, although the rates of animals returned to shelters suggests that this number is probably not very large.
		Intake rates and spay/neuter rates will both be high or low based on the rate of animal ownership/guardianship in the population.
		Adding other relevant variables might also help to explain the percent of animals that are relinquished or lost to the street outside of the impact of spay/neuter procedures, thus further isolating the effect of spay/neuter procedures.
	www.firepaw.org /crossprogram.doc (1821 words)

	"Twinport", Opel plans to reduce the fuel consumption of small gasoline engines
		With an innovative variable intake control system called "Twinport", Opel plans to reduce the fuel consumption of small gasoline engines (up to a maximum size of 1.6 liters) by as much as six percent.
		This is precisely what Opel's engineers have achieved with their variable intake control system: at partial load one of the two intake ports to each cylinder of the four-valve engine is partly blanked off by closing a throttle just before the mixture reaches the intake valve.
		For successful use of the shutdown principle, the intake ports and the mixture formation process before and after entering the cylinders had to be optimized.
	www.theautochannel.com /news/2002/04/16/038851.html (613 words)

	Variable valve timing - Wikipedia, the free encyclopedia
		The precise control the system has over the intake valves allows for the intake charge to be controlled entirely by the intake valves, eliminating the need for a throttle valve and greatly reducing pumping loss.
		Porsche VarioCam Plus - Varies intake valve timing by rotating the cam in relation to the cam sprocket as well as duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
		Varies duration, timing and lift of the intake and exhaust valves by switching between two different sets of cam lobes.
	en.wikipedia.org /wiki/Variable_valve_timing (1640 words)

	AUDI AG
		These requirements can be met by installing a variable intake manifold: at low engine speeds a longer pipe increases torque and improves responsiveness.
		At higher speeds the shorter intake manifold is effective for high performance.
		Variability is the basis for an optimum torque curve over the entire engine-speed range, as well as for good acceleration and elasticity.
	www.audi.com.au /glossary/v/variable_intake_manifold.html (68 words)

	Rheinmetall AG - Rheinmetall's tradition of automotive excellence: The variable intake manifold saves the plant in ...
		In the Audi 100 "2.8E" and "Quattro" models, this variable intake manifold made of gray cast iron was pre-assembled as a module for the very first time, complete with throttle body, exhaust gas recirculation and idle speed adjustment, tested and delivered ready for installation.
		The intake manifold is in fact only one of the products that have ensured the survival of the Neuss-based automotive company since 1990, but it has symbolic value: the rescue of the Nettetal plant is closely associated with the new development of the variable intake manifold.
		A variable intake manifold from Nettetal was built into the four-wheel drive Audi 100 for the first time—thus opening a new chapter in Kolbenschmidt Pierburg AG's success story, which over the whole Rheinmetall-Automotive range has lasted to this day, up to and including the current Audi V 8.
	www.rheinmetall-detec.de /index.php?lang=3&fid=3040 (3153 words)

	Cam Phasing and VVT in a pushrod V6? - CamaroZ28.Com Message Board
		With active air intake, air entering the engine is continuously tuned through a valve in the intake manifold to deliver optimized low-, mid-range and high-rpm torque.
		Variable valve timing is used to bolster performance, enhance economy and reduce emissions.
		Variable cam phasing and variable intake length combine to flatten out the torque curve at full throttle allowing 90% of max torque throughout most of the operating range.
	web.camaross.com /forums/showthread.php?t=368770 (1380 words)

	About (Site not responding. Last check: 2007-10-29)
		This features a variable intake system which employs an air intake valve and intake port that can be regulated to provide higher volume efficiency.
		At this point, the effective air intake port length extends from the lower intake opening to the intake valve.
		At this point, the effective air intake port length extends from the intake opening of the variable intake valve to the intake valve.
	www.independent-solutions.net /vx/about.html (877 words)

	"Simple" Intake How-to for Turbine 2.1 - Turbine (Site not responding. Last check: 2007-10-29)
		What this does is to set a Velocity variable called $loginGroup to an instance of the LoginForm business object (and if the returned object has values in its fields and appropriate "getter" methods then this would prepopulate the intake group with the values.
		Intake data is retained in the request in order to allow for the possibility that it will be re-presented to the user on the next page.
		Intake allows for this by providing a way of removing the data that is no longer appropriate to display.
	jakarta.apache.org /turbine/turbine/turbine-2.3.2/howto/intake-howto.html (2172 words)

	New-Generation 2005 Mercedes-Benz SLK Convertible Arrives
		However, the debut of the 2005 SLK coupe roadster also marks the arrival of a new high-tech engine family from Mercedes-Benz, one which is characterized by four valves per cylinder and variable valve timing for both the intake and exhaust valves.
		Variable intake and exhaust valve timing requires separate camshafts for the intake and exhaust, so the new SLK powerplant represents the first time Mercedes-Benz has used double-overhead camshaft technology on their V6 engines.
		While the variable valve timing system gets a lot of credit for the engine's unusually broad torque curve, a two-stage intake manifold plays a key role as well.
	www.theautochannel.com /news/2004/08/19/210534.html (1104 words)

	Audi > Glosario > Engine & Driveline > Variable intake manifold
		These requirements can be met by installing a variable intake manifold: at low engine speeds a longer pipe increases torque and improves responsiveness.
		At higher speeds the shorter intake manifold is effective for high performance.
		Variability is the basis for an optimum torque curve over the entire engine-speed range, as well as for good acceleration and elasticity.
	www.audi.com /audi/aola/cl/tools/glossary/engine_driveline/variable_intake_manifold.html (115 words)

	Cold Air Intake Research - Know More About Your Cold Air Intake
		Intake systems can take on many different styles and is made from plastic, metal, rubber (or silicone) or even composite materials (fiberglass, carbon fiber or Kevlar).
		The intake noise is usually increased, as the resonator (whose job is to reduce the noise) is replaced by the intake.
		The intake is placed in such a way that the car's forward motion pressurizes the air coming in, creating a "ram-air intake".
	www.coldairintakedirect.com /coldairintake_guide.php (986 words)

	BMW Technology Glossary (Site not responding. Last check: 2007-10-29)
		The fully variable intake system works precisely where the mixture of petrol and air is produced to suit the required engine performance.
		Whilst the differentiated intake system (DISA) provides to different intake distances, the fully variable intake system allows the length to be adjusted infinitely.
		The worm-type adjustment mechanism powered by a step motor allows the intake pipe length to be adjusted perfectly to the requirements in terms of power and speed.
	www.bmw.com.au /script/technology/technology.asp?id=47 (207 words)

	AutoZine Technical School - Engine
		Variable intake manifolds introduce one or two more stages to deal with different engine speeds.
		Variable length intake manifolds is commonly used in sedans.
		Instead, it uses a rotary intake manifold with the inlet at the center of the rotor.
	www.autozine.org /technical_school/engine/tech_engine_2.htm (1844 words)

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