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Topic: Opposed piston engine

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	Opposed piston engine - Wikipedia, the free encyclopedia
		Fairbanks-Morse opposed piston diesel engines on the submarine USS Pampanito.
		In the Jumo 205 and its variants, the upper crankshaft serves the exhaust pistons, and the lower crankshaft the intake pistons.
		Shown is the layout of an Otto cycle two-stroke engine similar to the one developed by engineer Kurt Bang at the Prüssing Office on the basis of the prewar DKW race engine.
	en.wikipedia.org /wiki/Opposed_piston (871 words)

	Engine configuration - Wikipedia, the free encyclopedia
		Engine configuration is an engineering term for the layout of the major components of an internal combustion engine.
		For example, the cylinder banks of a 180° V engine do not in any way form a V, but it is regarded as a V engine because of its crankshaft and big end configuration, which result in performance characteristics similar to a V engine.
		On the other hand, some V-twin engines which have none of the typical V engine crankshaft design features and consequent performance characteristics are also regarded as V engines, purely because of their shape.
	en.wikipedia.org /wiki/Engine_configuration (383 words)

	Flat engine - Wikipedia, the free encyclopedia
		A flat engine is an internal combustion engine in which the cylinders are arranged in two banks on either side of a single crankshaft so that the motion of all the pistons is in a single plane.
		Front-mouned air-cooled flat-twin engines were used by Citroën in their model 2CV and its derivatives, while the Citroën GS used a flat-4, and a flat-6 was proposed for the Citroën DS but rejected.
		These engines can run very smoothly and free of vibrations with a four-stroke cycle, regardless of number of cylinders, and do not require a balance shaft or counterweights on the crankshaft to balance the weight of the reciprocating parts which are required in other engine configurations.
	en.wikipedia.org /wiki/Flat_engine (899 words)

	Opposed piston (Site not responding. Last check: 2007-11-04)
		Opposed piston engines are essentially two-stroke cycle engines, as there is no cylinder head for the valves of a four stroke cycle.
		An opposed piston engine is one in which the cylinders are double-ended,...
		The Opposed Piston Opposed Cylinder (opoc™) engine is a significant advancement in the art of combustion engines.
	www.serebella.com /encyclopedia/article-Opposed_piston.html (868 words)

	Opposed piston (Site not responding. Last check: 2007-11-04)
		An opposed piston engine is one in which the cylinders are double-ended, with a piston at each end and nocylinder-head.
		Opposed piston engines are essentially two-stroke cycle engines,as there is no cylinder head for the valves of a four stroke cycle.
		In the Jumo 205 and its variants, the upper crankshaft serves the exhaust pistons, and the lowercrankshaft the intake pistons.
	www.therfcc.org /opposed-piston-125998.html (237 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		The upper and lower pistons drive separate crankshafts which are interconnected by a vertical drive shaft and gears with a suitable flexible coupling of coil spring design.
		Fresh air is admitted to the cylinders and exhaust gases are expelled by the pistons uncovering and covering the inlet ports and the upper end and the exhaust ports near the lower end of the cylinder.
		Thus during the one revolution of the crankshaft and two strokes of the pistons, compression, injection, combustion, expansion, exhaust and scavenging occur in the cylinder.
	www.trainnet.org /Libraries/Lib002/OP_ENGIN.TXT (491 words)

	USS Spinax Home Page
		The engines and generators can be connected electrically to the propulsion motors for propulsion when surfaced, or any two generators to the propulsion motors when submerged and snorkeling.
		This valve is connected to the engine rooms by piping in the superstructure that connects at the hull with a 22" manually operated flapper valve.
		The engine is an eight cylinder Fairbanks Morse opposed piston engine.
	www.spinax.com /aftengine.htm (519 words)

	Submarine Main Propulsion Diesels - Chapter 1
		Hence, vibrations developed by the engines could not be conducted to the propeller shafting and propellers, and the various stresses encountered by the propellers could not be transmitted directly to the engines as was the case with mechanical couplings.
		As the piston travels toward the inner dead center during the compression stroke, the air in the cylinder is reduced in volume.
		Piston action is so timed that at one point of travel the two pistons come into close proximity to each other near the, center of the cylinder.
	www.maritime.org /fleetsub/diesel/chap1.htm (6722 words)

	Doxford Engine Friends Association Karl Otto Keller (1877 - 1942) Page. (Site not responding. Last check: 2007-11-04)
		Doxfords had been experimenting on a single piston diesel unit for the past twelve months, this was later abandoned in favour of the opposed piston type.
		It was a single-cylinder Opposed Piston Unit and was part of an engine developing 450 H.P. The cylinder bore was 500mm and it was to run at 130rpm.
		The value of marine Diesel engines cannot be over estimated, and from a technical as well as a personal standpoint, the death of Karl Otto Keller in 1942 was a great loss to the marine engineering world.
	www.doxford-engine.com /keller.htm (537 words)

	Galveston Railroad Museum
		The engine is nicknamed "Big Mike" in memory of Mike Leigh who was in charge of maintenance in the early days of the Museum.
		The engine, which is an opposed piston type engine, has 10 cylinders and generates 2000 horsepower.
		This engine was never owned by Union Pacific, but was painted in UP colors because of the presence of the UP in Galveston.
	www.galvestonrrmuseum.com /upe410.htm (126 words)

	Products
		Historically, first successful techniques capable to predict engine charging were those accounting for wave motion phenomena in engine ducts in 1D unsteady gasdynamical formulation.
		Even without detailed modeling of complex multidimensional flow usual for engine working process, this technique may occasionally give quite accurate simulation results (that is especially true in cases for which obvious limitations of 1D formulation aren't appear).
		Piston then goes down, generating a rarefaction wave in the intake duct, that, in turn, travels to the open end.
	www.horsepowerlab.com /products.html (1823 words)

	Fairbanks Morse Engine - Opposed Piston (Site not responding. Last check: 2007-11-04)
		Compared to other engine designs, Opposed Piston engines have less than half the moving parts.
		Pistons, Bearings and Connecting Rods - Upper and lower piston assemblies may be removed from the lower crankcase, simplifying maintenance procedures.
		Due to the Opposed Piston's two-stroke cycle design and conservative operating speed (900 and 1000 rpm), aluminum alloy main and rod bearign life is extended.
	www.fairbanksmorse.com /engines/commercial/op/op_const.htm (170 words)

	Green Car Congress: Concept: Oscillating Piston Engine (Another Toroidal Engine)
		The OPE is one of a number of toroidal internal combustion engines currently under development, including the MYT engine (earlier post), the VGT RoundEngine, the Rotary Opposed Piston Engine (ROPE), and the Trochilic engine.
		A toroidal engine is one in which the power pistons rotate in a perfectly circular chamber with the drive shaft at the geometric center.
		In a four-stroke-cycle engine, a rapid combustion is followed by an intake stroke which significantly cools the piston and the cylinder prior to the next power stroke.
	www.greencarcongress.com /2006/05/concept_oscilla.html (1072 words)

	Opposed-piston engines (Site not responding. Last check: 2007-11-04)
		In opposed-piston engines that are common to Navy service, the crankshafts are connected by a vertical gear drive which provides the power developed by the upper crankshaft.
		Movement of the opposed pistons is such that the crowns are closest together near the center of the cylinder.
		In engines of the opposed-piston type, as in 2-stroke cycle single-acting engines, there is an overlap of the various events occurring during a cycle of operation.
	www.tpub.com /engine3/en3-18.htm (1198 words)

	#2 Engine (Site not responding. Last check: 2007-11-04)
		Main Engine #2, a Fairbanks-Morse Model 38D8-1/8, 2-cycle supercharged diesel engine, developing a maximum of 1600 horsepower at 720 RPM.
		This engine is a left hand rotation, vertically opposed type, with two crankshafts (upper and lower), 9 cylinders and eighteen pistons.
		It has no heads, the pistons work against each other in each cylinder, forming a single combustion space between them at the center of the cylinder.
	www.njnm.com /subtour/engine2.htm (67 words)

	Halfbakery: Open-head Four
		The basis of this engine is to utilize the 'cylinder walls' in a traditional combustion engine, as pistons themselves.
		Each piston has a separate, single crankshaft and all four crankshafts are synchronized via a planetary gear that encompasses the entire perimeter of the engine.
		The main trouble with the four piston, one chamber type proposed here is the amount of space it takes up for the one combustion chamber, and the weight and complexity of the drive and valvetrain needed, especially in four stroke form.
	www.halfbakery.com /lr/idea/Open-head_20Four (3115 words)

	Engine Overview (Site not responding. Last check: 2007-11-04)
		Engine management with single lever operation is greatly simplified with both carb heat and mixture controls eliminated.
		The twin cylinder opposed piston engine has two pistons in each cylinder with the combustion chamber formed between the crowns of the pistons.
		The cylinders are ported at each end with one ring of ports opened by the air piston supplying the fresh air charge, and the other opened by the exhaust piston and connected to the exhaust system.
	www.dair.co.uk /documents/engine/engineoverview.htm (314 words)

	3D Vortex Simulation of Flow in An Opposed-Piston Engine (Site not responding. Last check: 2007-11-04)
		The latter is converted to a source on the boundary of the domain, which allows the grid-free evaluation of the potential velocity field using the boundary element method.
		As a result, grid-free simulation of flow in the complex geometry of engines during the entire intake and compression strokes is made possible.
		In this paper, the formulation for the method and preliminary results from the simulation of the swirling flow inside a typical two-stroke opposed-piston engine are presented.
	www.edpsciences.org /articlesproc/Vol.7/abs/gharakhani.html (200 words)

	Diesel Engine
		aircraft engine, with two crankshafts, one at either end of a single bank of cylinders.
		Napier Deltic diesel engines, with three crankshafts serving three banks of double-ended cylinders arranged in an equilateral triangle, with the crankshafts at the corners.
		Junkers Jumo 223 and the Deltic, each big end bearing serves one inlet and one exhaust piston, using a forked connecting rod for the exhaust piston.
	www.ssbn608.org /diesel.htm (482 words)

	Atlas F1 Magazine: The F1 FAQ
		This type of engine has been used in marine and railroad applications (especially Fairbanks-Morse units) for some time and with quite a bit of success -- they are notable for their high torque output -- although vibration can be a problem.
		Opposed piston designs do not used conventional poppet valves, but use ports in the cylinder walls.
		The FIA Technical regulations state that engines for F1 must be 4-stroke, hence no opposed piston F1 engines.
	www.atlasf1.com /2001/aug08/faq.html (1429 words)

	Drive mechanisms of an opposed-piston engine (Site not responding. Last check: 2007-11-04)
		because (1) power is supplied by two crankshafts in an opposed-piston engine, instead of one, and (2) the camshaft drives of the engines we have discussed thus far supply power to one or more accessories as well as to the valve-actuating gear.
		This is not true of the camshaft in an opposed-piston engine since ports are used instead of valves for both intake and exhaust.
		While the two engines described in preceding sections had only gear-type drive mechanisms, the opposed-piston engine used as an example in this section has chain assemblies as well as gear trains incorporated in the mechanisms that supply power to engine parts and accessories.
	www.tpub.com /engine3/en3-65.htm (268 words)

	Martin's Fairbanks Morse page
		The main engines of the Tanu are Fairbanks Morse engines built in Dorval, Quebec.
		This means that there are two crankshafts in the engine, one at the bottom end, and one at the top end.
		Once the bottom pistons has reached "bottom dead center", it joins the top piston, which leads by 12 degrees, as they head on a collision course.
	www.dieselduck.ca /machinery_page/fairbanks_morse/fairbanks_morse.htm (853 words)

	Opposed piston engine: Encyclopedia topic (Site not responding. Last check: 2007-11-04)
		With the addition of supercharger (supercharger: Compressor that forces increased oxygen into the cylinders of an internal-combustion engine) or turbocharger (turbocharger: a turbocharger is a compressor used in internal-combustion engines to increase the...
		[follow hyperlink for more...]) opposed piston engines can very efficient two-stroke cycle (two-stroke cycle: the two-stroke cycle of an internal combustion engine differs from the more common four-stroke...
		However some attempts were made to build non-diesel 4-stroke engines but as there is no cylinder head the bad location of the valves and the spark plug makes them unefficient.
	www.absoluteastronomy.com /reference/opposed_piston_engine (348 words)

	License help for Canadian Engineers - 1st class Engineering Knowledge
		What would be the advantage of a two stroke diesel engine having a direct drive to the scavenge pump, or having an indirect driven rotary scavenge pump.
		Sketch the lower piston crosshead arrangement as adopted in Doxford opposed piston engine.
		Some piston rings are made with an eccentric shape where the radial thickness is greatest diametrically opposite the gap.
	www.dieselduck.ca /library/exam_stuff/1st_ek_motors.03.htm (2803 words)

	Fairbanks Morse Engine - Opposed Piston (Site not responding. Last check: 2007-11-04)
		The Fairbanks Morse Opposed Piston (OP) engine has been designed and developed for a wide array of electrical power generation and heavy industrial applications.
		OP engines have even provided standby power for the country's most critical applications, including take-home power for nuclear submarines, emergency reactor cooling in nuclear power facilities, and emergency power for vital life support and telecommunications networks.
		When equipped with Enviro-Design, dual fuel technology, the OP engine is ideally suited for low-cost electric power production, and is one of the most efficient low emission natural gas engines in the world.
	www.fairbanksmorse.com /engines/commercial/op/op.htm (235 words)

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