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Topic: Variable Length Intake Manifold

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Variable intake

Ford Duratec engine

Variable valve timing

Forced induction

Chrysler LA engine

Ford SHO V6 engine

Internal combustion engine

Ford Modular engine

Ford Taurus

Ford 385 engine

Ford Triton engine

Supercharger

Cadillac Fleetwood

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List of Ford engines

	Split plenum intake manifold with variable runners - Patent 5762036
		The intake manifold of claim 1 further including a plurality of base sections mounted to the runner shaft between the runner blades that, together with the corresponding runner blades and the upper surface portion of the manifold housing, define runner passages, one each to a respective one of the outlet passages.
		The intake manifold of claim 5 wherein the one of the plurality of runner blades is extendible circumferentially into the divider by an angle.phi..sub.0, and the runner shaft is rotatable by an angle greater than.phi..sub.0 to selectively allow flow between the two sections of the variable plenum.
		The intake manifold of claim 1 wherein the one of the plurality of runner blades is extendible circumferentially into the divider by an angle.phi..sub.0, and the runner shaft is rotatable by an angle greater than.phi..sub.0 to selectively allow flow between the two sections of the variable plenum.
	www.freepatentsonline.com /5762036.html (3768 words)

	Method for diagnosing errors in an intake system of an internal combustion engine having a variable intake manifold ...
		Compared to rigid intake systems, whose geometric configuration of intake manifold lengths, pipe diameters, or container capacities represents a compromise with respect to the location and magnitude of the maximum torque or power, the full-load characteristics may be optimized by expanding the variability.
		The principle of variable intake systems is based, among other factors, on the fact that sympathetic oscillations, for example, are generated in the air mass that is drawn into the intake manifold.
		Errors occurring in the regulating unit for the intake manifold geometry of the intake system are detected by comparing the signals in the error case (erroneous signals detected) with signals in the error-free case (reference or setpoint variables).
	www.freshpatents.com /Method-for-diagnosing-errors-in-an-intake-system-of-an-internal-combustion-engine-having-a-variable-intake-manifold-geometry-dt20060817ptan20060184311.php (2241 words)

	Variable Length Intake Manifold - Biocrawler (Site not responding. Last check: 2007-11-01)
		As the name implies, VLIM can vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency.
		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.
	www.biocrawler.com /encyclopedia/Variable_length_intake_manifold (354 words)

	CanadianDriver: Auto Tech - BMW's 7-Series engine technology
		The intake manifold design is not restricted by having to position a throttle plate.
		You may have seen tall intake manifolds used at the drag strip to "ram" the air into the engine.
		Many manufacturers are producing "staged" intake manifolds, where internal valves are opened or closed to vary the effective length of the intake passages.
	www.canadiandriver.com /articles/jk/020213.htm (721 words)

	Rheinmetall AG - Rheinmetall's tradition of automotive excellence: The variable intake manifold saves the plant in ...
		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.
		In general, an intake manifold is understood to be piping that uses negative pressure to transport liquids or gases.
		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)

	Variable length intake manifolds
		The length and the diameter of the intake and exhaust ducts have a great influence on the torque and power curves of an engine.
		The principle rests on the pressure waves of the gas columns inside the intake ducts, waves induced by the cyclic openings and closing of the valves.
		If the period of these waves enters in phase with the rhythm of opening of the valve, phenomenon which occurs in a rev range determined by the length of the duct, some supercharging effect is obtained without the assistance of a compressor.
	www.histomobile.com /histomob/tech/2/73.htm (267 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.
		In this case, it is predicted that the area under the theoretical power curve for the variable length plenum would be less then 2% greater then that of the best fixed setup.
	www.mne.psu.edu /me415/fall05/SAE/intake.html (854 words)

	New AMG 6.3 Liter V8 Engine - In Detail - GermanCarFans.com (Site not responding. Last check: 2007-11-01)
		Together with the innovative, variable intake manifold of magnesium with two integral throttle flaps, the large air intake cross-sections familiar from motorsport, the streamlined design of the intake and exhaust ducting and the vertical arrangement of the intake and exhaust ducts ensure that all eight cylinders are perfectly charged.
		The air intake at the front of the vehicle is of dual-flow design; two integral hot film airflow sensors behind the air filters provide the engine electronics with the necessary information about the temperature and density of the intake air.
		While the intake valves are being opened the exhaust valves also remain open for a short time, and at this point some of the exhaust gases flow from the exhaust to the intake side.
	www.germancarfans.com /print.cfm/ID/2050713.001/lang/eng (6262 words)

	The Hindu Business Line : Varying the engine performance
		Variable valve timing is also called variable valve actuation or variable cam timing and various car manufacturers have different abbreviations for their versions.
		But in the absence of variable valve timing the engine's valves may be tuned for a fixed opening and closing cycle that will dampen peak engine performance by choking air intake early, or by feeding too much air at low engine rpm levels leading to a lot of un-burnt fuel being wasted away.
		Variable valve timing controls the engine valves' lift (for increased air flow) and/or the duration (longer for high power and shorter for low speeds) and/or the timing (for coming up with the correct response for the driver's demands).
	www.thehindubusinessline.com /iw/2006/11/26/stories/2006112604151700.htm (989 words)

	Ford, Cosworth Technology Team Up On High Performance SVT Focus Engine
		The cylinder head is revised to increase flow through the intake ports, and the intake valve diameter was increased to 33.5mm from 32mm.
		Variable timing has been added to the intake camshaft, which is the first such application on a Ford vehicle in North America.
		The dual-stage system varies the length of the intake runners, utilizing long runners at low rpm to improve torque development, and short runners at higher rpm for better peak power.
	media.ford.com /print_doc.cfm?article_id=7675 (1355 words)

	Technical Mysteries Unraveled
		Variable intake manifolding is increasingly more popular since the mid-90s.
		Variable length intake manifolds is commonly used in saloons.
		Instead, it uses a rotary intake manifold with the inlet at the center of the rotor.
	www.ukcar.com /features/tech/Engine/turbo/vario.htm (850 words)

	Technically Speaking: Intake Manifold (Site not responding. Last check: 2007-11-01)
		Today the fuel injection system delivers gasoline much closer to the cylinder – at the base of the intake manifold next to the intake valves of the cylinder head – where it mixes with air from the intake manifold to become an extremely precise mixture of air and fuel.
		The intake manifold of the naturally aspirated (non-turbocharged) Subaru horizontally opposed engine is positioned on the upper part of the engine.
		Working on the manifold gave Itoh a deeper appreciation of the intake manifold’s flexibility and overall importance as part of the Subaru engine and driving experience.
	www.drivesubaru.com /Win03_Manifold.htm (739 words)

	Audi Worldwide > Glossary > 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/com/en2/tools/glossary/engine_driveline/variable_intake_manifold.html (116 words)

	[No title]
		The principle of variable length intake manifold depends upon the resonance of air inside the intake tract.
		This is because if we place the filter too close to the intake manifold, by using a very short metal pipe for e.g., we will effectively change the length of the intake tract and thus the resonance frequency it supports (a short intake tract will have a higher resonance frequency).
		The principle of a variable length intake manifold, usually with dual runners like the one used on the R18A is that they make use of two sets of intake runners.
	asia.vtec.net /Engines/R18A/index.html (3476 words)

	A Suite Of New Engines For 2001 - Popular Mechanics
		The intake manifold and cylinder heads have been redesigned so that all the passages and ports are nearly identical.
		There’s a die-cast aluminum oil pan for improved bottom-end rigidity, and a serpentine flex pipe from the exhaust manifold to the EGR valve that serves as a miniradiator.
		The camshaft lobes were reshaped and the intake and exhaust systems were made less restrictive, which raised horsepower from 197 to 200 and torque from 223 to 235 ft.-lb.
	www.popularmechanics.com /automotive/new_cars/1266636.html?page=3 (1753 words)

	2006 Honda Civic 1.8L Engine Information
		With the new i-VTEC engine, intake valve closure timing is delayed to control the air intake volume, allowing the throttle to open wider under low-load conditions for a major reduction in pumping loss of up to 16 percent.
		During this time, pumping losses are incurred due to increased intake resistance through the small throttle valve opening, a significant factor that leads to reduced engine efficiency.
		Other innovations include a variable-length intake manifold that delivers optimum inertia effect to further improve intake efficiency for powerful torque delivery at rpm ranges typical in normal driving.
	www.collegehillshonda.com /artman/publish/article_293.shtml (409 words)

	460 Ford Intake Manifold
		As the name implies, VLIM can vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency.
		Manifold (automotive engineering) - In automotive engineering, an intake manifold or inlet manifold is a part of an engine that supplies the fuel/air mixture to the cylinders.
		Ram-air intake - A ram-air intake is any air intake system which uses the air pressure created by vehicle motion to increase the air pressure inside of the intake manifold on an engine.
	in10.goednieuwskrant.com /460fordintakemanifold.html (305 words)

	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)

	Rheinmetall AG - Mercedes-Benz supplements lineup — the Grand Sports Tourer: KSPG also inside the new R-Class
		The R350 6-cylinder gasoline engine includes Pierburg components: the intake section has the two-length magnesium intake manifold which is already installed in Mercedes S-Class vehicles and manufactured at Pierburg's Nettetal site.
		The air supply to the engine can be varied depending on load and RPM thanks to the proven technology of the magnesium intake manifold.
		Various products from KS Gleitlager GmbH inside the new 6-cylinder R320 CDI diesel engine with common rail direct injection of the third generation ensure smooth engine operation.
	www.rheinmetall.com /index.php?fid=1812&lang=3 (538 words)

	AutoZine Technical School - Engine
		Variable length intake manifolds is commonly used in sedans.
		Especially at low speed, the slow air flow in the intake manifold led to imperfect mixing of fuel and air, hence knocking and reduced power and torque.
		The theory was quite simple: the intake manifold for each cylinder was split into two separate sub-manifold which joint together near the intake valves.
	www.autozine.org /technical_school/engine/tech_engine_2.htm (1844 words)

	Intake Manifold Tech: Runner Size Calculations - Team Integra
		By choosing the length and diameter of the runners, an intake manifold can be "tuned" for optimum performance at a certain RPM range.
		The general rule is that you should begin with a runner length of 17.8 cm for a 10,000 rpm peak torque location, from the intake opening to the plenum chamber.
		The best way to find out if your TB is too small for your IM plenum is to determine what the intake manifold absolute pressure (MAP) sensor is reading (in the plenum) when you are at full throttle (or wide open throttle (WOT)) while the car is accelerating using a datalogger.
	www.team-integra.net /sections/articles/showArticle.asp?ArticleID=471 (1371 words)

	Intake Design
		According to Winterborne, “The basic mechanism of intake manifold ‘tuning’ is to provide a high pressure at the intake valve so that the mass flow rate into the cylinder is boosted at a given engine speed.” Runner size has a large impact on this pressure.
		By changing either the length or diameter of the runner, it is possible to manipulate this pressure peak to correspond with a desirable engine speed.
		The runner lengths employed on the intake for the preliminary (testing) design are 22 inches for the long, primary stage, and 7.5 inches for the short, secondary stage.
	www.mne.psu.edu /me415/SPRING02/intake/intake.html (1485 words)

	Reference.com/Encyclopedia/Variable Length Intake Manifold
		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 and it was also found on the Yamaha V6 in the Taurus SHO.
		Mazda VICS (Variable Inertia Charging System) is used on the Mazda FE-DOHC engine and Mazda B engine family of straight-4s, and VRIS (Variable Resistance Induction System) in the Mazda K engine family of V6 engines.
	www.reference.com /browse/wiki/Variable_Length_Intake_Manifold (561 words)

	Port & Polish Intake Manifolds
		For the heavy work I used a long shaft electric die grinder with a variable speed control from Harbor Freight Unregulated, this die grinder runs way too fast (25,000 RPM), but with a variable speed control, it can be slowed to the point that it is useable for porting.
		This is the bottom of the upper intake with a gasket in place to show where material needs to be removed (red dye) to gasket match it.
		Once the lower intake is on the car, you can use a flashlight to check the port alignment between the intake and the head.
	www.miracerros.com /mustang/port_intakes.htm (1629 words)

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