Valve lift - Factbites

Valve lift - Factbites
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Topic: Valve lift

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	Glossary Of Technical Terms
		Maximum valve lift is the greatest height the valve head moves off of the valve seat; it is the lift of the cam (lobe height minus base-circle diameter) multiplied by the rockerarm ratio.
		If maximum valve lift is increased but the duration (crankshaft degrees) that the valve is held off of the valve seat is kept the same, then rate at which the valve opens must increase (same time to reach a higher lift).
		Compression Pressure: The pressure created in the cylinder when the piston moves toward top dead center (TDC) after the intake valve closes, trapping the induced charge (normally a fuel/air mixture) within the cylinder.
	www.motionsoftware.com /glossary.htm

	Information Notice No. 88-68: SETPOINT TESTING OF PRESSURIZER SAFETY VALVES WITH FILLED LOOP SEALS USING HYDRAULIC ASSIST DEVICES
		Lift points were 2435 and 2384 psig for valve 2-68-563, 2430 and 2432 psig for 2-68-564, and 2390 psig for 2-68-565.
		The lifting force required to open the valve was measured by a load cell and recorded on a strip chart to provide data necessary to calculate the valve setpoint.
		The valve lifts were performed using water heated to 120øF and pressurized by nitrogen.
	www.nrc.gov /reading-rm/doc-collections/gen-comm/info-notices/1988/in88068.html (1266 words)

	Pontiac Cams
		RPM-Range (1500-4800) Valve Lift (.425.425) Valve Lash Hot (.000.000) ADV.
		RPM-Range (1500-4800) Valve Lift (.480.480) Valve Lash Hot (.000.000) ADV.
		RPM-Range (2000-5500) Valve Lift (.435.435) Valve Lash Hot (.000.000) ADV.
	avs.epix.net /schorrperformance/cams/_Pontiac.htm (1266 words)

	Greg Hartwell - American Motorcycles
		Net valve lift Now this is what the motor actually sees when all things are brought in to play things like, lash (or hyd lifter compression) valve train deflection, rocker arm ratio and what ever else may effect the valve train.
		For example if the number is.495 it means the cam will lift the LIFTER.495 because the rocker arms don't have a 1:1 ratio this is not the amount that the valve lifts.
		Cam shift lift This is the number every one throws around when talking cam.its the number that the cam lifts the lifter.
	www.hartwellmotorcycles.com /cams.html (1266 words)

	Engine Technologies
		When and how long the valves open (timing) and how much the valves move (lift) both affect engine efficiency.
		Also called variable valve actuation (VVT), variable-cam timing and variable valve timing and lift electronic control (VTEC®)
		Valves control the flow of air and fuel, into the cylinders and exhaust out of them.
	www.fueleconomy.gov /feg/tech_engine_more.shtml (531 words)

	AutoZine Technical School - ENGINE
		Therefore the left rocker arm, which actuates the left inlet valve, is driven by the low-lift left cam.
		The right rocker arm, which actuates the right inlet valve, is driven by the medium-lift right cam.
		Note that their dimensions are also different - the middle cam (fast timing, high lift), as shown in the above diagram, is the largest ; the right hand side cam (slow timing, medium lift) is medium sized ; the left hand side cam (slow timing, low lift) is the smallest.
	www.geocities.com /gkurka2001/CarTech/vvt_2.htm (620 words)

	Adjustable valve system for a multi-valve internal combustion engine - US Patent 5445117
		The valve system defined in claim 18 wherein said rocker arms are disposed asymmetrically relative to said first and second valves whereby axially shifting said camshaft from a first position to a second position increases the lift of said first and second valves, and decreases the difference in lift between said first and second valves.
		The valve system defined in claim 18 wherein said rocker arms are disposed asymmetrically relative to said first and second valves whereby axial shifting of said camshaft adjusts the lift of said first valve a first amount and adjusts the lift of said second valve a second amount smaller than said first amount.
		One method of accomplishing low impact realignment of the rocker and valve is for the axial height of the cam lobe to contribute the same amount to lifting the valve as the cam axial slope contributes to closing the valve through the full rotation of the cam at a first cam shaft axial position.
	www.patentstorm.us /patents/5445117.html (620 words)

	Flatlander Racing
		Good idle, daily usage, and off road, towing, performance and fuel efficiency, compression ratio 8.75 - 10.5 to 1, 2600 - 3000 cruise rpm, basic rpm range 2000 - 4500 rpm, 6500 rpm attainable with proper valve springs and lifters.
		The duration at.050 lift (intake/exhaust) is 228º/238º; valve lift is.540"/.540"; lobe centerline is 114.
		The duration at.050 lift (intake/exhaust) is 218º/228º; valve lift is 500"/.500"; lobe centerline is 114.
	www.flatlanderracing.com /liftersgm.html (620 words)

	FORD HP ENGINES
		5.8L/351W, GT-40 Aluminum heads 1.94"/1.54" valve size, roller cam dur@.050" 220/220, lift:.498"/.498", 9.0:1 compression ratio, roller rocker, street/strip, 362HP
		5.8L/351W, GT-40 Aluminum heads 1.94"/1.54" valve size, roller cam dur@.050" 228/228, lift:.552"/.552", 9.0:1 compression ratio, roller rocker, bracket race, 385HP
		514 "COBRA JET" Aluminum heads, 2.20"/1.76" valve size, roller cam dur@.050" 254/258, lift:.640"/.640", 9.8:1 compression ratio, roller rocker, bracket race, 625HP
	www.goautocenter.com /ford_hp_engines.htm (620 words)

	New Tech - Variable valve timing
		In broad terms, big valves and extreme high-lift camshafts with substantial overlap of inlet and exhaust valves, while essential for top-end power, are not particularly compatible with a dawdle to the supermarket.
		Each pair of valves is opened by the third lobe, which has higher lift and opens the valves for longer.
		Concepts for both hydraulic and electromagnetic valve control may have broken out like a rash lately, but Honda& VTEC (variable valve timing and lift electronic control) made its production debut in 1989 billed as the first system controlling both valve lift and timing.
	www.indiacar.com /infobank/ntech_valvetiming.htm (466 words)

	New Page 0
		It is used to vent the lifting gas and to deflate the envelope.
		The fabric is held in place by the lifting gas and is centered over the opening in the envelope by use of centering lines.
		Lifting Force – The lifting force is equal to the weight of the air mass that is displaced by its filling gas mass.
	www.gasballooning.net /Gas%20Ballooning%20Term%20and%20Definitions.htm (466 words)

	Halcyon: Closed Circuit Lift Bags
		Designed to be filled by a diver's second stage regulator, the SCC 60 combines the ease of inflation of a traditional bell-bottomed lift bag with an over-pressure release valve to dial in a precise amount of lift and to prevent damage caused by over-inflation at depth.
		Halcyon's lift bags can be inflated through a low pressure inflator hose and feature a one-way valve to ensure that the bag will maintain lift all the way to the surface.
		To prevent an out-of-control lift, the diver must first try to match the lift capacity of the bag to the weight of the object for example, use a 100 pound bag on a 100 pound anchor, or as close as possible.
	halcyon.net /mc/liftbags.shtml (466 words)

	Check Valve
		The silent check valve is applied on lift pipe or fluid pipe with pressure.
		The design of the valve is full flow lift type which allows for a long
		The silent check valve applied on the outlet of the pump should be selected carefully, and it must be able to resist the highest pressure, the largest water hammer effect and the biggest fluid impact.
	www.solenoidvalves.co.uk /CHF.htm (203 words)

	Dynamic CR
		Compression of the air/fuel mixture cannot start while the intake valve is open.
		Determining what the compression ratio is after the intake valve closes provides valuable information about how the engine will perform with a particular cam and octane.
		Solid cams are usually speced at an abitrary lift value (often.015" or.020") determined by the designer to be a good approximation of the cam's profile.
	www.empirenet.com /pkelley2/DynamicCR.html (203 words)

	VALVETRAINS: Better Materials & Design, Larry Carley, Automotive Rebuilder, November 1997
		Honda's "Variable Valve Timing and Electronic Lift Control System" (VTEC) on the Accura NSX 3.0L DOHC V6 is unique in that it has extra lobes on the cam and extra rocker arms that come into play at higher rpm to increase valve lift and duration.
		Overhead cam multivalve engines are changing the way engines are rebuilt, but they'll likely never entirely replace pushrod engines because of the tradeoffs we have described.
		Installed valve height affects the geometry of the valvetrain, so the tips of the valve stems should be ground to maintain the proper height when the valves and seats are refaced.
	www.babcox.com /editorial/ar/ar119736.htm (203 words)

	Compressor bypass valve (CBV) / Blow off valve (BOV)
		relief valve is forced firmly closed under pressure conditions (turbo on boost), until such time as a lower pressure condition occurs with throttle lift-off or between gear changes.
		When on-boost and changing gear (throttle lift-off), a sudden lower pressure condition is created in the manifold and the valve is pulled open again, directing pressurised air back to the turbo inlet.
		Both valves are plastic moulded, look the same, and have exactly the same inside and outside diameters.
	wwwrsphysse.anu.edu.au /~amh110/Technical_pages/blow_off_valve.htm (1043 words)

	Engine & fuel engineering - Hi-lift flow vs Mid-lift flow
		I profiled a cam which has.800" net lift thru its entire lift curve to see how long the valve was at what point, the piston velocity, and the flow at that lift.
		I have found the biggest single factor affecting low, mid and high lift flow is the valve seat angle.
		In some racing classes where the cam may be lift restricted there is some gain to optimizing low lift flow.
	www.eng-tips.com /viewthread.cfm?qid=92513 (3150 words)

	Wafer Butterfly Valve
		We are mainly in wafer type butterfly valve, lug type butterfly valve, flanged butterfly valve, metal sealed butterfly valve, wafer check valve, swing check valve, lift check valve, balancing valve and y-strainer.
		We export our valves to United State, Egypt, Middle East, Iran, Singapore, Taiwan, Korea, France, Germany, Australia, etc. We can make butterfly valve, wafer check valve, balancing valve, lift check valve, y-strainer with GB, API, BS, DIN, ISO, JIS, ANSI standards.
		Tang Shan Hong Yuan Valve Industry Co. located in Tangshan, China, is one professional valve manufacturer and distributor.
	www.afacerionline.com /index.php/ShowRoom/showDetails/2784 (199 words)

	08309.000217&ELEMENT_SET=DECL
		Valve actuating mechanism as in claim 2 wherein a slot is formed in the control member and a slide includes a pin on the control lever and operatively engaging the slot, the slot being angled from a radial direction to provide the higher angular ratio in the low valve lift range.
		Valve actuating mechanism as in claim 10 wherein a slot is formed in the control member and a slide includes a pin on the control lever and operatively engaging the slot, the slot being angled from a radial direction to provide the higher angular ratio in the low valve lift range.
		Valve actuating mechanism as in claim 6 wherein the biasing means is a spiral spring acting between an oscillating cam and the control member to draw the roller follower against the rotary cam.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/08309.000217&ELEMENT_SET=DECL (3205 words)

	The Automatic Enrichment Device
		Main valve and jet needle lift, to set
		Main valve and jet needle lift, to set—Operation N/Q-22A
		To measure jet needle lift insert probe through hollow grub screw.
	www.rover.org.nz /manuals/aed/aed7.htm (3205 words)

	CanadianDriver: Auto Tech - Honda's VTEC engine technology
		By using the engine computer to vary both valve timing and valve lift, the engine's volumetric efficiency and performance are increased.
		These cam lobes give a relatively short valve lift and duration (length of time the valve is open) to ensure good cylinder filling at low engine speeds.
		By advancing the camshaft position in relation to the crankshaft position, low speed performance is enhanced because the valves are closed sooner and cylinder pressures are higher at low rpm.
	www.canadiandriver.com /articles/jk/at_010529.htm (764 words)

	Which Variable Valve Timing is better ? ? - Honda-Acura.net
		The way I remember I tell the difference between variable cam timing and varible valve timing, is that vvt changes the actual lift and duration of the valves (as can be seen by the fatter lobes on a vtec cam).
		Instead the valves are pneumatically (or maybe hydraulically) actuated and their lift, duration and timing is all computer controlled.
		Of those 3 VVt-i is probably the best because the variation is done in the head, not in the cam as is the case with VTEC and MIVEC reducding paracidic loss to wight in the valve train.
	www.honda-acura.net /forums/showthread.php?t=34779 (1653 words)

	hwe.html
		This tutorial is made to give you the basic understanding on how to navigate and customize your viewports inside of Valve Hammer Editor to make your own levels.
		This video is just a temporary solution on how to create a simple lift, there will be a correct one later, this one is using a brush like a door to actually move the lift.
		Valve made a couple of special entities to make them without any hassle, you can make awsome rope fast
	www.mnemic.tk /education/videotutorials/hwe.html (497 words)

	BOV - Blow Off Valve -
		A CBV (compressor bypass valve) style, are open most of the time under engine vacuum (idle, cruise, throttle lift-off), but close firmly under positive (boost) pressure.
		With the valve closed under boost pressure, a sudden throttle lift-off between gear changes creates an instant vacuum inside the inlet manifold which pulls the valve* open, momentarily venting boost pressure.
		Both valves are plastic molded, look the same, and have exactly the same external and inside diameters.
	members.shaw.ca /turbofiero/bov1.htm (497 words)

	Honda-Acura.net - Which Variable Valve Timing is better ? ?
		Instead the valves are pneumatically (or maybe hydraulically) actuated and their lift, duration and timing is all computer controlled.
		The way I remember I tell the difference between variable cam timing and varible valve timing, is that vvt changes the actual lift and duration of the valves (as can be seen by the fatter lobes on a vtec cam).
		BMW is comming out with a system to match to its double VANOS system which consists of rocker arms situatuated on a movable fulcurum, allowing for infinite VTEC (not two stage anymore).
	www.honda-acura.net /forums/showthread.php?t=34779 (497 words)

	f_MiscPage_1.chtml
		3.0 liter DOHC aluminum-alloy 24 valve 6-cylinder horizontally opposed SUBARU BOXER engine and Active Valve Control System (AVCS) and Active Valve Lift System (AVLS).
		2.5-liter SOHC aluminum alloy 16 valve horizontally opposed, 4-cylinder boxer engine with i-Active Valve Lift System (AVLS).
		Available in a 5 or 7 passenger model.
	www.bloomington.subaru.com /en_US/f_MiscPage_1.chtml (497 words)

	Patent 4703734: Multi-valve internal combustion engine
		As the butterfly valve 8 is closed the induction occurs as if the high speed inlet valve 7 were disabled and thus the induction characteristics are therefore controlled exclusively by the lift timing of inlet valve 2.
		Viz., as the butterfly valve in the cae of of a 1,800 cc engine (merely by way of example) has a surface area of from 6 to 8 cm.sup.2, the valve tends to be subject to a sudden force of the order of 3 to 4 Kg.
		The closure timing of the inlet valves 2, 7 with the first embodiment is such that both valves close after BDC of the compression phase and that the slow speed inlet valve 1 closes prior the high speed one (7).
	www.freepatentsonline.com /4703734.html (497 words)

	Advance Valves - Flow Control Solution, Dual Plate Check Valve,Butterfly Valve, Concentric, Double Eccentric, Triple Eccentric, Balancing Valve, Enginnering Valve, Hydronic Balancing, Valves for Cryogenic Applications, Special Metallurgy, Titanium Valve
		The Dual Plate Check Valve is an all purpose non return valve that is much stronger, lighter in weight and smaller in size compared to a conventional swing check valve or lift check valve.
		The two plates in Dual Plate Check Valve are hinged in the center vertically for horizontal installations, altogether eliminating the effect of the gravity.
		Dual Plate Check Valve has much lower pressure drop due to lower force.The best analogy between a swing check valve and Dual plate Check Valve would be a door hinged from the top and a door hinged on its side with an appropriate door closure.
	www.advancevalves.com /DualCheck_design_1.php (882 words)

	World Intellectual Property Organization
		The lower part of the mandrel 4 comprises a bellow 17 in which a pressurized gas, such as nitrogen, is present, and which serves to regulate the opening of the check valve 11 such that a minimum pressure on the gas side is maintained and reverse flow from the tubing 1 is prevented.
		These expanding gas (Taylor) bubbles may bypass the oil so that an unstable flow regime is created and in extreme cases mainly lift- gas is produced and hardly any oil.
		The present invention aims to alleviate this drawback of the conventional lift-gas injection techniques by providing a gas lift technique wherein the risk of lift- gas rapidly slipping through the produced crude oil is reduced.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/83944.011108&ELEMENT_SET=DECL (882 words)

	Sunami Turbo.com - FAQ
		Once the vacuum switch is tuned exactly to your liking, the SUNAMI will trigger the blow off valve sound every time you reach the set boost level and slightly lift your foot off the gas pedal; just like a real turbo equipped vehicle.
		The override push button, which is installed inside the vehicle, will the trigger the blow off valve sound every time it is pressed.
		If we recorder the sound onto the memory chip at a higher volume, you will experience a bit of distortion as well as an unrealistic image.
	www.sunamiturbo.com /faq.html (521 words)

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In the News (Sat 26 Dec 09)