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Topic: Double overhead camshaft

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	Camshafts- DragTimes.com
		The relationship between the rotation of the camshaft and the rotation of the crankshaft is of critical importance.
		Some engines use one camshaft each for the intake and exhaust valves; such an arrangement is known as a double or dual overhead cam (DOHC), thus, a V engine may have 4 camshafts.
		The lobes of the camshaft are usually slightly tapered, causing the cam followers or valve lifters to rotate slightly with each depression, and helping to distribute wear on the parts.
	www.dragtimes.com /camshafts.php (477 words)

	Camshaft - Biocrawler (Site not responding. Last check: )
		The relationship between the rotation of the camshaft and the rotation of the crankshaft is of critical importance.
		In a two-stroke engine that uses a camshaft, each valve is opened once for each rotation of the crankshaft; in these engines, the camshaft rotates at the same rate as the crankshaft.
		Some engines use one camshaft each for the intake and exhaust valves; such an arrangement is known as a double or dual overhead cam (DOHC), thus, a V engine may have 4 camshafts.
	www.biocrawler.com /encyclopedia/Camshaft (470 words)

	Overhead camshaft engine - Patent 4681069
		An overhead camshaft engine as set forth in claim 1, in which said camshaft is further formed with a cut in such a manner that said first mentioned cut and said second mentioned cut are arranged at angular intervals of 180.degree.
		An overhead camshaft engine as set forth in claim 1, in which said camshaft is further formed with two cuts in such a manner that said first mentioned cut and said second mentioned cuts are arranged at angular intervals of 120.degree.
		The minimum distance between the two camshafts 2, 3 is the sum of the distance between the axes of the head bolts 14, the diameter of the head bolt 14 and the diameter of the camshafts 2 or 3.
	www.freepatentsonline.com /4681069.html (1617 words)

	Overhead Camshafts - Wikicars
		The cams operate the valves directly or by a short rocker as opposed to overhead valve cam-in-block engines, which have tappets and long pushrods to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
		A double overhead camshaft (also called double overhead cam, dual overhead cam or twincam) valvetrain layout is characterized by two camshafts being located within the cylinder head, where there are separate camshafts for inlet and exhaust valves.
		Double overhead camshafts are not required in order to have multiple inlet or exhaust valves, but are necessary for more than 2 valves that are directly actuated (though still usually via tappets).
	wikicars.org /en/Overhead_Camshafts (603 words)

	NationMaster - Encyclopedia: Poppet valve
		Double overhead cams control the opening and closing of a cylinders valves The camshaft is an apparatus used in piston engines to operate poppet valves.
		A pushrod engine or overhead valve (OHV) engine is a type of piston engine that places the camshaft below the pistons (usually beside and slightly above the crankshaft in a straight engine or directly above the crankshaft in the V of a V engine) and uses pushrods or rods to...
		More modern designs have the camshaft on top of the cylinder head, pushing directly on the valve stem (again through cam followers), a system known as overhead camshaft; if there is just one camshaft, this is a single overhead cam or SOHC engine.
	www.nationmaster.com /encyclopedia/Poppet-valve (2139 words)

	Overhead camshaft - WOI Encyclopedia Italia
		Single overhead camshaft is a design in which a one camshaft is placed within the cylinder head.
		Instead the cams operate the valves directly or by a short rocker as opposed to overhead valve cam-in-block engines, which have long pushrods to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
		Double overhead camshafts are not required in order to have multiple inlet or exhaust valves, but are necessary for more than 2 valves that are directly actuated (though still usually via tappets).
	www.wheelsofitaly.com /wiki/index.php/Overhead_camshaft (627 words)

	Overhead camshaft (Site not responding. Last check: )
		Single overhead camshaft is a design in which one camshaft is placed within the cylinder head.
		The cam operates the valves directly or through a rocker arm as opposed to overhead valve pushrod engines, which have tappets, long pushrods and rocker arms to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
		Double overhead camshafts are not required in order to have multiple inlet or exhaust valves, but are necessary for more than 2 valves that are directly actuated (though still usually via tappets).
	www.tocatch.info /en/SOHC.htm (608 words)

	Overhead camshaft - Encyclopedia, History, Geography and Biography
		Single overhead camshaft is a design in which one camshaft is placed within the cylinder head.
		The cams operate the valves directly or by a short rocker as opposed to overhead valve pushrod engines, which have tappets and long pushrods to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
		Double overhead camshafts are not required in order to have multiple inlet or exhaust valves, but are necessary for more than 2 valves that are directly actuated (though still usually via tappets).
	www.arikah.com /encyclopedia/Overhead_camshaft (632 words)

	Overhead camshaft - Wikipedia, the free encyclopedia
		Single overhead camshaft is a design in which one camshaft is placed within the cylinder head.
		The cam operates the valves directly or through a rocker arm as opposed to overhead valve pushrod engines, which have tappets, long pushrods and rocker arms to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
		A dual overhead camshaft (also called DOHC, double overhead cam, dual overhead cam, or twin cam) valve train layout is characterized by two camshafts being located within the cylinder head, where there are separate camshafts for inlet and exhaust valves.
	en.wikipedia.org /wiki/Overhead_camshaft#Dual_overhead_camshaft (782 words)

	Musclecarclub.com - Library - Tech - Engine
		The overhead camshaft is also something that we think of as a relatively new development, but it's not.
		The double overhead cam shaft (DOHC) is the same as the overhead camshaft, except that there are two camshafts instead of one.
		The camshaft controls the opening and closing of the valves by regulating the time that the valve is opened and closed, and how much the valve is opened by.
	www.musclecarclub.com /library/tech/engine.shtml (4719 words)

	MG twin Cam Racing Cams - Features - European Car Magazine
		Overhead valves were considered quite advanced when they appeared on Oldsmobile's Rocket V-8 engine and Cadillac's V-8 of 1949 and William Lyon's remarkable double overhead cam six-cylinder Jaguar XK engine seemed radical when it was introduced as a production engine in 1948.
		The double overhead camshaft engine has an aluminum head that has been machined from a solid billet and with its engine-turned surface is described as looking like a Type 51 Bugatti.
		The twin overhead camshafts ride in five bearings and are driven with Offenhauser gears that are in turn driven by chain from an extra gear attached to the original camshaft.
	www.europeancarweb.com /features/0506ec_twin_cam_mg_racing_engines/index.html (2340 words)

	AutoWeb - BA Falcon Engine Reveal
		To ensure perfect seating of the camshafts, the four VCT oil control galley plates are bolted to the top of the cylinder head before the galleys for the camshafts are bored.
		The cylinder head is taller and more complex thanks to double overhead camshafts, four valves per cylinder and the positioning of the oil control valves for the dual VCT atop the camshafts.
		Falcon is the first Ford to use this engine which now boasts VCT variable camshaft timing on the single overhead camshaft bank as well as three valves per cylinder, electronic throttle control, failsafe cooling system and unique designed inlet and exhaust manifolds for the Falcon application.
	www.autoweb.com.au /cms/A_55183/newsarticle.html (4333 words)

	NationMaster - Encyclopedia: Chrysler 3.3 engine
		This 3.5 L (3518 cc) engine is a bored-out (to 96 mm) version of the 3.3, but with the important addition of overhead cams.
		Another notable feature is that the four valves per cylinder are driven by a single overhead camshaft as opposed to the conventional DOHC arrangement for multivalve engines.
		Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods.
	www.nationmaster.com /encyclopedia/Chrysler-3.3-engine (1341 words)

	Dieselstation.Forums > Pushrods vs Overhead Cams
		If one camshaft is used, it is often referred to as a SOHC or single overhead camshaft engine.
		DOHC of double overhead camshaft engines allow the designer to vary camshaft timing for the intake and exhaust valves separately because one camshaft operates the intake valves while the other operates the exhaust valves.
		There are even overhead camshaft engines that use pushrods too, but these pushrods are very short and don't pass through the engine block or cylinder head casting.
	www.dieselstation.com /forums/lofiversion/index.php/t4005.html (1024 words)

	Overhead Camshaft
		On overhead cam engines, the camshaft is mounted directly above the cylinder head (valves) and as it turns the valve lifters ride up on the lobe resulting in opening the valve.
		Overhead camshafts are usually driven by a timing chain, belt, or combination of the two.
		An engine with an overhead cam means that the distance between the cam and the valves is much shorter, so the valves respond quicker and valve adjustment can be more accurate.
	www.autospeednet.com /sites/3dauto.com/viewterm/4609/0 (174 words)

	Valve driving mechanism for double overhead camshaft engine (US5181485)
		A valve driving mechanism for a double overhead camshaft engine includes a camshaft drive mechanism, including a camshaft sprocket for transmitting engine output from a crankshaft of the engine to one of intake and exhaust camshafts.
		The valve timing varying mechanism includes a first helical gear, mounted on the exhaust camshaft for rotation, a second helical gear, in mesh with the first helical gear, which is rigidly secured to the intake camshaft, and a cylindrical sliding element, mounted on the exhaust camshaft for axial displacement.
		said camshaft drive means including internal helical splines cut in a direction opposite to helical threads of one of said helical gears mounted on said one of said intake and exhaust overhead camshafts.
	www.delphion.com /details?pn10=US05181485 (486 words)

	Engines: Engine Components: Camshafts & drives
		The overhead camshaft is located in the cylinder head.
		Double overhead cam systems often use a bucket tappet.
		Timing belts and chains are used on overhead camshaft engines, because the camshaft is further from the crankshaft.
	www.cdxetextbook.com /engines/comp/camshaftsDrives/title.html (130 words)

	Moto Guzzi, Quadzilla, cpi, Vincent, Triumph, Norton, BSA, Motorcycles
		The Hyosung GT 250R is the perfect full size sports bike for those on the 33BHP licence or for those riders wanting to hone their skills before progressing onto a larger engined machine.
		The Hyosung GT 250R specification includes a Double OverHead Cam (DOHC) 4-stroke V-twin engine, twin piston hydraulic disc brakes, 'upside-down' front suspension, alloy wheels, electric start and green digital instrumentation.
		This stylish bike is equipped with everything needed for riding the streets whilst staying true to its off road heritage.
	philclassic.co.uk /hyosung.htm (596 words)

	VVTL Camshaft
		The camshaft is an ordinary shaft, outlined with the shaded area.
		In the background the same camshaft is shown after its machining and before the assembling of all cam-lobes (inlet and outlet).
		The major advantage of the new camshaft over the existing variable valve timing systems is that both phase angle and lift can be adjusted in a continuous way along the whole RPM range of the engine resulting in a smooth power and torque output with low level of emissions.
	www.help-forward.gr /out/vvtl.html (1515 words)

	AutoWeb - BA Falcon Engine Reveal
		To ensure perfect seating of the camshafts, the four VCT oil control galley plates are bolted to the top of the cylinder head before the galleys for the camshafts are bored.
		The cylinder head is taller and more complex thanks to double overhead camshafts, four valves per cylinder and the positioning of the oil control valves for the dual VCT atop the camshafts.
		Falcon is the first Ford to use this engine which now boasts VCT variable camshaft timing on the single overhead camshaft bank as well as three valves per cylinder, electronic throttle control, failsafe cooling system and unique designed inlet and exhaust manifolds for the Falcon application.
	autoweb.drive.com.au /cms/A_55183/newsarticle.html (4333 words)

	Basic Understanding of Camshafts - Tech Article - Chevy High Performance Magazine
		Because the camshaft is designed to operate at exactly half of the crankshaft speed, the camshaft sprocket is twice as large as the crankshaft sprocket.
		The lift that is typically referred to in a camshaft catalog is the valve, or gross lift, and is achieved by multiplying the lobe lift by the rocker arm ratio.
		Camshaft duration is the amount of crankshaft rotation that occurs as the cam lobe moves the lifter off of the base circle; it is measured in crankshaft degrees to make it easier to degree (check) the cam to make sure it is positioned properly in the engine.
	www.chevyhiperformance.com /techarticles/148_0505_camshaft_basics (1905 words)

	4x4 Glossary
		Overhead Cam – Overhead camshaft describes a type of valvetrain arrangement in which the engine’s camshaft is in its cylinder head –; above (or over) the valves.
		When the camshaft is placed close to the valves, the valvetrain components can be stiffer and lighter, allow the valves to open and close more rapidly and the engine to run at higher rpm.
		Pushrod –; In the valvetrain of an overhead valve (OHV) engine, pushrods are used to transfer the reciprocating motion from the camshaft to the rocker arms and then to the valves.
	www.toyota-gib.com /german/vehicles/4x4_guide/4x4_glossary.htm (3149 words)

	Overhead Camshaft SOHC,DOHC & more... - JDM Universe.com (Site not responding. Last check: )
		In order to accomplish this the camshaft is linked to and kept in synchronisation with the crankshaft (the main shaft upon which the pistons act) through the use of a metal chain, rubber belt or geartrain.
		For this reason, the camshaft is connected to the crankshaft either directly, via a gear mechanism, or indirectly via a belt or chain called a timing belt or timing chain.
		The lobes of the camshaft are usually slightly tapered, causing the cam followers or valve lifters to rotate slightly with each depression, and helping to distribute wear on the parts.
	www.jdmuniverse.com /forums/showthread.php?t=64261 (5205 words)

	Cartrackers.com (Site not responding. Last check: )
		Overhead Cam The type of valvetrain arrangement in which the engine's camshaft(s) is in its cylinder head(s).
		When the camshaft(s) is placed close to the valves, the valvetrain components can be stiffer and lighter, allowing the valves to open and close more rapidly and the engine to run at higher rpm.
		Overhead Valve (OHV) An acronym for overhead valve.
	www.cartrackers.com /auto_glossary/o (695 words)

	Camshaft
		As the camshaft spins, the lobes open and close the intake and exhaust valves in time with the motion of the piston.
		The main reason to use double overhead cams is to allow for more intake and exhaust valves.
		The camshafts on some Ferrari engines are cut with a three-dimensional profile that varies along the length of the cam lobe.
	home.wanadoo.nl /xavira/camshaft/cam.htm (1534 words)

	Overhead camshaft Information
		In an inline engine this means there is one camshaft in the head, while in a V engine there are two camshafts: one per cylinder bank.
		The cams operate the valves directly or by a short rocker as opposed to overhead valve cam-in-block engines, which have tappets and long pushrods to transfer the movement of the lobes on the camshaft in the engine block to the valves in the cylinder head.
		Overhead view of Suzuki GS550 head showing dual camshafts and drive sprockets.
	www.bookrags.com /Double_overhead_cam (577 words)

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