Piston ring - Factbites

Piston ring - Factbites
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Topic: Piston ring

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	Piston Tech - Team Integra
		In a piston without gas ports, the ring is pressurized by gases that work their way to the back of the ring through the clearance between the ring and its groove.
		Piston rings must seal (for good compression pressures and prevent oil from getting into the chamber), have shorter break-in period, and wear the walls less despite being closer.
		When installing new piston rings remember to always check the end ring gap clearances according to manufacturer specs (a good rule of thumb for piston to wall clearances in Tegs is for every inch of cylinder bore use 0.0040-0.0043 in.
	www.team-integra.net /sections/articles/showArticle.asp?ArticleID=183 (4503 words)

	Piston Tech - Team Integra
		In a piston without gas ports, the ring is pressurized by gases that work their way to the back of the ring through the clearance between the ring and its groove.
		Hypereutectic pistons are stronger and can run narrower ring lands and tighter piston-to-wall clearances, since there is less heat expansion than standard cast.
		Here you see a higher top ring and piston pin location placed at the level of the oil ring groove, both of which allows for a longer rod and better rod ratio in these forged race-only strutted pistons.
	www.team-integra.net /sections/articles/showArticle.asp?ArticleID=183 (4503 words)

	0900823d80181f5c.jsp
		A shiny surface on the pin boss side of the piston usually indicates that the connecting rod is bent or the wrist pin hole is not in proper relation to the piston skirt and ring grooves.
		By hand, gently compress the piston rings to be used in the cylinder, one at a time, and using an inverted piston to to keep the ring square to the cylinder bore, push the piston ring down into the cylinder bore.
		With the crankshaft protected, use a hammer handle or piece of wood or plastic to push the rod and piston upward in the cylinder until the connecting rod is clear of the crankshaft journal.
	www.autozone.com /servlet/UiBroker?ForwardPage=/az/cds/en_us/0900823d/80/18/1f/5c/0900823d80181f5c.jsp (4503 words)

	Caltech Authors - A universal time scale for vortex ring formation
		The universality of this number was tested by generating vortex rings with different jet exit diameters and boundaries, as well as with various non-impulsive piston velocities.
		Utilizing a piston/cylinder arrangement in a water tank, the velocity and vorticity fields of vortex rings are obtained using digital particle image velocimetry (DPIV) for a wide range of piston stroke to diameter (L/D) ratios.
		The vorticity field of the leading vortex ring formed is disconnected from that of the trailing jet.
	resolver.caltech.edu /CaltechAUTHORS:GHAjfm98 (439 words)

	AC DePuydt, Inc.
		We've got W-packing, piston cups, flanges, and wear rings ready to be used in any application.
		Looking for two piece piston seals, T seals, cast iron piston rings, or rod buffer rings?
		No that's not a typo, one hundred inch in diameter.
	acdepuydt.com (439 words)

	Piston Siezures of High Performance Personal Watercraft
		As this snowballing material grows, it will drive the opposite side of the piston against the cylinder wall with a pressure so terrific that scoring begins to take place.
		Both sides of the piston will show heavy scoring and seizure marks on each side of the wrist pin hole.
		A piston ring, in an excessively large cylinder bore, will have a very wide end gap not to mention very weak ring tension against the cylinder wall.
	www.groupk.com /seizures.html (3991 words)

	Macrotech Polyseal Product Literature
		Low leakage is attained by the high unit loading exerted by the two legs of the piston ring due to the reduced seal footprint.
		The Piston Rings are excellent for reciprocating situations, slow rotary and oscillating applications because of their self-lubricating qualities - virtually eliminating slip-stick.
		The MPI Grooved Piston Ring is a high performance, bi-directional seal intended for use where extremely low leakage is required.
	www.polyseal.com /pliterature.asp (1258 words)

	Performance Pistons, Larry Carley, Engine Builder, June 2005
		Forged pistons have been around since the mid-1950s, and were used as original equipment pistons in many of the muscle car engines during the heyday of the muscle car era (mid 1960s to early 1970s).
		Piston manufacturers are introducing new performance pistons for all of these applications as well as refining existing piston designs to reduce weight, and improve strength, durability and ring sealing.
		Cast pistons are usually adequate for most passenger car applications, but when it comes to modified high output engines, marine engines, boosted engines (turbocharged or supercharged), or engines that are "bottle-fed" nitrous oxide, a piston upgrade is usually a must.
	www.automotiverebuilder.com /ar/eb60522.htm (3484 words)

	Rod Rings, Packing Cases, Compressor Piston Rings, Riders, Piston Rod Packing, Finite Gap Piston Rings, Static Pac - C. Lee Cook
		The broadest line of sealing products in the industry including rod rings, packing cases, piston rod packing, and engine and compressor piston rings and riders.
		Thermoplastics, cast iron, bronze and other materials are available to provide the most durable compressor piston rings and riders for your compressors and engines.
		Today, rod ring design options and material choices from bronze to high-performance non-metallics assure the optimum ring for your applications.
	www.cleecook.com /products.html (3484 words)

	ÃÀ¹ú×¨ÀûÉêÇë¹«¿ªËµÃ÷Êé 20040101417 - Volume control apparatus of radial piston pump or motor and positioning apparatus
		Accordingly, a servo piston (8) is operated following to a control valve (9), presses a cam ring (2) so as to position the cam ring at a position in correspondence to a volume control pressure, and regulates a volume.
		Volume control apparatus of radial piston pump or motor and positioning apparatus
		The invention provides a volume control apparatus of a radial pump or motor which downsizes a hydraulic pump or motor, reduces a weight thereof and improves a freedom in arrangement, and a positioning apparatus.
	cxp.paterra.com /uspregrant20040101417cn.html (3484 words)

	Variable-Stroke Radial-Piston Pump
		Plungers or pistons, which extend outward from each cylinder, are pinned at their outer ends to slippers which slide around the inside of a rotating floating ring or housing.
		When the floating ring is forced off-center to one side of the pump shaft, the pistons reciprocate and the pump operates.
		In the radial-piston pump, the cylinders are arranged radially in a cylinder body which rotates around a nonrotating central cylindrical valve.
	www.tpub.com /engine3/en33-37.htm (3484 words)

	Vertically coupled optical resonator devices over a cross-grid waveguide architecture - US Patent 6411752
		An optical material 1710 is attached to the piston 1700, and the piston varies the proximity between the material and the ring resonator 1702.
		Unlike vertically coupled ring resonators of the prior art, in which the ring and bus waveguides were both buried, or both air-clad, the invention seeks to have bus waveguides that are buried and ring waveguides that are air-clad.
		In order to correct for undesired variations, the physical characteristics of the ring or rings need to be modified.
	www.patentstorm.us /patents/6411752.html (3484 words)

	Technical Database - Engine
		Low-drag piston rings, digital exhaust gas recirculation, direct-impingement fuel-injection targeting, and a quick-start ignition were added in 1988.
		Lightweight pistons with floating pins and low-tension rings in combination with shorter cast-steel connecting rods reduce reciprocating mass and internal friction.
		Roller rocker arms, a higher compression ratio, and reduced piston ring tension improved efficiency in 1993.
	engine.firebirdv6.com /3800history.html (3484 words)

	main.htm
		A piston ring is installed in a groove on the rotor shaft on both the turbine and compressor side.
		It is therefore of vital importance to determine the maximum component temperatures at the critical points, to avoid the formation of lacquer and carbonized oil in the turbine-side bearing area and on the piston ring.
		As turbochargers have to meet different requirements with regard to map height, map width, efficiency characteristics, moment of inertia of the rotor and conditions of use, new compressor and turbine types are continually being developed for various engine applications.
	www.turbomustangs.com /turbotech/main.htm (15379 words)

	PISTON DIAGNOSTIC GUIDE
		This piston was overheated so badly that a hole melted through the crown and collapsed the ring grooves on the exhaust side.
		Install one circlip in the piston, install the piston into the cylinder with the pin hole exposed, install the piston pin through one side of the piston, position the cylinder over the connecting rod and push the piston pin through until it bottoms against the circlip, install the other circlip.
		This piston crown has been damaged because debris entered the combustion chamber and was crushed between the piston and the cylinder head.
	www.eric-gorr.com /tech/pistonguide.html (2050 words)

	KD Piston Ring Compressors
		Use these pliers to install pistons from 25/8 to 5-7/8" (67 to 149mm) in diameter A self locking ratchet allows you to compress rings in small increments.
		Use these bands with 1114 Pliers to compress piston rings from 2-7/8 to 4-5/8" in diameter.
		Use compressor to install pistons 3-1/2 to 6-1/2" (89 to 164mm) in diameter on trucks and tractors.
	www.mytoolstore.com /kd/kdengi08.html (414 words)

	Piston Ring
		Piston ring materials for automobile engines are being changed from current cast iron to steels due to the severe operating conditions of engines, and cost saving for piston ring production process.
		ASL42 and ASL81 which are C-Cr martensitic stainless steels show excellent wear resistance, corrosion resistance and heat resistance in comparison with Si-Cr steel and cast iron rings.
		Hitachi Metals has developed and now is supplying high quality steels,
	www.hitachimetals.com /product/specialtysteel/automotive/pistonring.cfm (82 words)

	Piston1
		Pistons should be run at the tightest clearance possible to minimize piston rocking, ring rocking, blowby, and noise.
		If a piston were loaded continually in the same manner, the only material property of importance would be the yield strength at the operating temperature of the piston.
		Hypereutectic pistons are slightly more expensive than cast in general, and the hypereutectic pistons used in this engine were only $29.
	members.tripod.com /~Mojo_Page/Piston1.htm (460 words)

	Vortex Dynamics
		The vorticity field of the formed leading vortex ring is disconnected from (pinched-off) that of the trailing jet at a critical value of L/D (dubbed the "formation number"), at which time the vortex ring attains a maximum circulation.
		Modeling of the vortex ring formation and the maximum achievable circulation at the exit of a shock tube is investigated.
		Formation of vortex rings at the exit of a shock tube is studied theoretically.
	enstrophy.colorado.edu /~mohseni/VortexDynamics1.html (781 words)

	VORTEX SSPC Paper
		The vortex ring generator is located at the bottom of the container and consists of a rapidly moving piston that is driven via a gear assembly by a stepper motor.
		VORTEX will examine, for the first time, the details of interface breakup and droplet formation by a vortex ring at a range of parameters relevant to fluid atomization processes with a resolution that can not be obtained in ground based experiments.
		VORTEX is an investigation of the propagation of a vortex ring through a liquid-gas interface in microgravity.
	www.engin.umich.edu /societies/seds/vortex/sspcpap/sspc_pap.html (4032 words)

	PISTON RINGS
		Stronger than ductile iron, capable of withstanding high speed pounding and loads that would destroy piston rings made of ordinary grey cast iron, and able to be formed into extremely narrow bands for bridging gaps between pistons and cylinder walls.
		Rings made out of these alloys are used uncoated for the second compression ring in many engine applications as well as the top ring in two cycle engines.
		Ceramic faced rings have been developed for drag racing applications, and Volvo currently is using a "Moly Cermet" (80% moly/20% chromium carbide ceramic) faced ring in a turbocharged heavy-duty truck engine.
	www.aa1car.com /library/ar293.htm (2270 words)

	Moparts on the Web - Main Index
		Piston ring grooves are also sealing surfaces, and must be clean, smooth and free of defects.
		Piston to Bore Clearance for hypereutectic pistons were Dyno tested at wide open throttle with.0015",.0020",.0035" and.0045" piston to bore clearance.
		Since it is the close collision between the piston and the cylinder head that reduces the prospect of detonation, never add a shim or head gasket to lower compression on a quench head engine.
	www.moparts.com /Tech/Archive/motor/3.html (5400 words)

	The Railway Carriages - Fact Sheets
		This mark will enable the piston to be entered into the Cylinder in the position which will bring the rod crosshead into correct relation to the trunnions without later having to twist the piston in the cylinder and thus disturb the setting of the rolling ring.
		When finally fitting the assembled Cylinder piston and rod in the casing it is convenient to place the casing on the floor alongside the bench, open end upwards.
		That in to say, application of the brake must not cause the vacuum brake piston rod to be forced upwards into the cylinder, and alternatively, application of the vacuum brake must not result in the compression of hand brake rods designed to work under tension.
	www.link-rail.com /railc/fact6.htm (5400 words)

	Stroking the Slant 6
		Other points of interest are that these pistons have higher ring groove placements, they are pretty light (482 grams with pin) and are available in a 1.5mm oversize (3.504 inches).
		This is a strong, lightweight (565g) piston, made of hypereutectic cast aluminum intended for a turbo 2.2 application.
		The bore, which is the size (diameter) of the piston.
	www.slantsix.org /articles/stroking/stroking.htm (2930 words)

	O-Ring Calipers - Corvette Forum
		Now having said that...your calipers will accommodate the O ring style pistons but it is recommended that they be purchased from the same manufactuer as the calipers so the tolerances are consistent.
		Calipers are equipped with either the standard lip ring style pistons or the newer O-ring style pistons.
		I am going to apply RTV sealant in the piston boot groove for the outer ring/seal and then some around the outer ring in the counterbore once installed.
	forums.corvetteforum.com /showthread.php?t=668134 (513 words)

	A History of Aeronautics - Chapter V.
		A ring of holes drilled round each cylinder constituted auxiliary ports which the piston uncovered at the inner end of its stroke, and these were of considerable assistance not only in expelling exhaust gases, but also in moderating the temperature of the cylinder and of the main exhaust valve fitted in the cylinder head.
		Stepped pistons were adopted, and the charging pump at one end was used to scavenge the power cylinder at the other ends of the engine, the transfer ports being formed in the main casting.
		Another good example of this type of engine was the Eole, which had eight opposed pistons, each pair of which was actuated by a common combustion chamber at the centre of the engine, two crankshafts being placed at the outer ends of the engine.
	www.worldwideschool.org /library/books/tech/engineering/AHistoryofAeronautics/chap38.html (1532 words)

	Vortex Rings
		A rare phenomenon is visible in this image (it shows much better on the enlarged version): a smoke ring has been emitted by SE Crater (the feature at right) and is being blown to the southwest (left) as it is gradually growing in diameter.
		His "Fog Fountain" would produce a constant mist as well as an occasional fog ring (reminiscent of the Camel billboard in Times Square) to remind the tourists of where they already were.
		At time t=0, a piston begins pushing fluid through the open end of a circular tube.
	enstrophy.colorado.edu /~mohseni/VortexRing1.html (480 words)

	Caltech Authors - A model for vortex ring formation in a starting buoyant plume
		It is also shown that, similarly to piston-generated vortex rings (Gharib et al.
		Vortex ring formation in a starting axisymmetric buoyant plume is considered.
		The dimensionless time of the pinch-off (the formation number) can be reasonably well predicted by assuming that at pinch-of the vortex ring propagation velocity exceeds the plume velocity.
	authors.library.caltech.edu /1347 (287 words)

	Krueger, Paul Samuel (2001-05-04) The significance of vortex ring formation and nozzle exit over-pressure to pulsatile jet propulsion. http://resolver.caltech.edu/CaltechETD:etd-09142005-111030
		The significance of vortex ring formation for this type of propulsion is studied experimentally using a piston-cylinder mechanism to generate starting and fully-pulsed, round jets of water into water at a maximum jet Reynolds number of 13,000.
		This transition occurs at a higher L/D for the PS ramps, allowing the effects of vortex ring formation and pinch off to be illuminated by comparison of the results for the NS and PS ramps.
		The propulsive benefit provided by a leading vortex ring over a trailing jet is connected to over-pressure at the nozzle exit plane during vortex ring formation.
	etd.caltech.edu /etd/available/etd-09142005-111030 (643 words)

	Piston And Ring Technology
		Piston rings perform a number of important functions.
		Ring groove smoothness is likewise extremely important; any waviness or roughness causes poor ring seal and can lead to microwelding—a destructive situation where, under extreme pressure, the rings momentarily attach themselves to high spots on the ring groove.
		Traditionally, these gapless rings went in the second groove along with a conventional top ring, but ring technology refinements plus the new thinking on ring sealing has led Total Seal to revise this installation scheme and introduce a new line of gapless top rings that achieve significantly less blow-by under real-world running conditions.
	www.carcraft.com /techarticles/77899 (643 words)

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In the News (Sun 19 May 13)