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Topic: Double overhead cam

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	Overhead camshaft - Wikipedia, the free encyclopedia
		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 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).
	en.wikipedia.org /wiki/Double_overhead_cam (614 words)

	APE - Cam terminology
		A cam follower made from high quality iron alloy that is heat treated by pouring the molten iron into a mold with a chilled steel plate at the bottom to heat treat the face of the lifter.
		The lobe is eccentric to the cam bearings of the camshaft and transmits a lifting motion through the valve train to operate the valves.
		At this temperature a chemical reaction occurs between the ammonia and the cam metal to form ferrous nitride on the surface of the cam.
	www.aperaceparts.com /tech/camterminology.html (1909 words)

	Camshaft
		On single and double overhead cam engines, the cams are driven by the crankshaft, via either a belt or chain called the timing belt or timing chain.
		Usually, double overhead cams are used on engines with four (or more) valves per cylinder -- a single camshaft simply cannot fit enough cam lobes to actuate all of those valves.
		At one end of the cam lobe is the least aggressive cam profile, and at the other end is the most aggressive.
	home.wanadoo.nl /xavira/camshaft/cam.htm (1534 words)

	- Valve Train Motion -
		It is clear from the picture that the cam lobe is only able to directly control the opening portion of the valve motion, by pushing the follower away from it.
		Here is a graph showing the motion of the cam followers for one cylinder of a two-valve (intake and exhaust) pushrod-rocker arm engine as a function of lobe rotation.
		The "zero motion position" is measured when the maximum lift portion of the cam lobe is opposite (180° away from) the lifter (known as the "base circle" or "heel" of the lobe).
	www.epi-eng.com /ET-Camshaft-ValvMotion.htm (1492 words)

	Delta Camshaft
		Some engines even employ a double overhead cam (DOHC) design in which there are two camshafts - one for the intake valves and the other for the exhaust.
		As the cam continues to rotate, the force is relieved and the valve closes.Usually, the contour on both sides of the lobe is the same (the contour, or profile, controls the acceleration of the valve).
		Cam lift is the distance the lifter is raised by the cam lobe.
	www.deltacam.com /tech.php (346 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 stock cam was left in the block to drive the oil pump and distributor while the two overhead camshafts are gear driven.
		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 (2275 words)

	Overhead Camshaft SOHC,DOHC & more... - JDM Universe.com
		Sliding friction between the surface of the cam and the cam follower which rides upon it is considerable.
		The valves are typically operated by a camshaft, which is a rod with a series of projecting cams (lobes), each with a carefully calculated profile designed to push the valve open by the required degree at the right moment and to hold it open as required as the camshaft rotates.
		Between the valve stem and the cam is a tappet, a cam follower, which accommodates variations in the line of contact of the cam.
	www.jdmuniverse.com /forums/showthread.php?t=64261 (5206 words)

	Cam Covers
		Cam Covers are available for the '93 through '99 Aurora and Northstar engines.
		New style cast aluminum cam covers with a double bump that shows everyone that this is a double overhead cam engine.
		All cam covers are ready to mount using your factory rubber o-rings from the stock cam covers.
	www.chrfab.com /cam_covers.htm (316 words)

	Camshafts Part II - Single Overhead Cam, Dual Overhead Cam and Pushrod Engines
		Usually, double overhead cams are used on engines with four or more valves per cylinder.
		This is the same as a double overhead cam engine because the engine has dual overhead cams just like in a double overhead cam engine.
		The overhead camshaft, which eliminates the pushrod from the system, is one of the engine technologies that made higher engine speeds possible.
	www.streetracersonline.com /articles/camshafts/2.php (664 words)

	GoaSearch.com.. your search begins here (Site not responding. Last check: 2007-10-13)
		On single and double overhead engines the crankshaft drives the cams via either a timing belt or timing chain.
		If the belt breaks the cam will stop spinning and the piston will hit the open valves hence they need to be replaced or adjusted at regular intervals.
		Double overhead cams are used on engines with four or more valves.
	www.goasearch.com /site/guides/auto_guide (7803 words)

	Car Talk
		He maintains that the benefit of double overhead cams is that the cams can rotate at half the speed of a single overhead cam.
		The speed of a double overhead cam is exactly the same as a single overhead cam.
		Ray: The advantage of a double overhead cam is simply that it reduces friction and mass by improving the geometry at the top end of the engine.
	www.cartalk.com /content/columns/Archive/1998/July/03.html (667 words)

	Twin-Cam Tech Analysis - Features - European Car Magazine
		In 1905 Delahaye had experimented with a double overhead camshaft with six inline valves per cylinder for a marine racing engine and set a new world's speed record on water.
		The double overhead camshafts were chain driven, greatly simplifying the gear-drive systems that were popular before the war.
		Pushrod overhead valve engines had become so entrenched that the introduction of a special Vega with a Cosworth twin-cam cylinder head in the 1970s was considered to be exotic in the extreme.
	www.europeancarweb.com /features/0209ec_twin_cam_analysis (2255 words)

	MG VINTAGE RACERS
		Ferrari joined the twin cam ranks in 1949 when Aurelio Lampredi converted Gioacchino Colombo's single cam V-12 Formula One engine, but it wouldn't be until the 1960s that a Ferrari GT car would be available to the public with a twin cam engine.
		Because the hot rod movement was in full swing and because overhead cam cylinder heads had been created for Model A Ford engines and for twin-cam Offy racing engines, there was a fair amount of knowledge available about making up new cylinder heads.
		What is perhaps most interesting is that the factory-built MGA Twin Cam suffered some of the same problems as these early pioneers did in their previous twin-cam efforts.
	www.mgvr.org /keepers/t_twins.html (1960 words)

	Akamoto nitrous oxide systems - Camshafts
		It turns out that there is a direct relationship between the shape of the cam lobes and the way the engine performs in different speed ranges.
		To understand why this is the case, imagine that we are running an engine extremely slowly -- at just 10 or 20 revolutions per minute (RPM) -- so that it takes the piston a couple of seconds to complete a cycle.
		This is why carmakers have developed schemes to vary the cam profile as the engine speed changes.
	www.akamoto.co.uk /resource-camshafts.htm (1362 words)

	Media.Ford.com: The Products
		A new double-overhead cam petrol engine developed from that fitted to the Ford Focus Â— the Duratec 16V Â— joins the Fiesta range in two small-car configurations, the 80-PS 1.4-litre, and a 100-PS 1.6-litre variant.
		DuratorqÂ’s camshaft is a hollow structure with sintered smooth cam lobes inserted onto the tube during manufacture.
		Duratec 8VÂ’s camshaft design is hollow tube fabricated with cam lobes that achieve their Â“netÂ” or final shape during the sintering process and do not require machining.
	media.ford.com /products/presskit_display.cfm?vehicle_id=503&press_subsection_id=423&make_id=92 (4876 words)

	CanadianDriver: Feature - Ten best engines for 2006
		BMW made the list with its 3.0-litre double overhead cam inline 6-cylinder as used in the new 330i sports sedan.
		Mazda took a place in the list by way of its 2.3-litre DISI turbocharged double overhead cam inline 4-cylinder, as used in the Mazdaspeed6.
		Not to be outdone, Toyota took an award in Ward's 10 Best with its 3.5-litre double overhead cam V6, as used in the new Lexus IS 350 sports sedan.
	www.canadiandriver.com /articles/tw/06wards10.htm (906 words)

	Cleaning Dirty Cam Covers
		If your engine is overhead cam, you’ll see one (called a single overhead-cam) or two (a double overhead-cam) long, straight shafts with what look like eggs stuck on them.
		Those include burnt cam lobes, spalling (flaking) of the lobe’s hardened surface or pitting of the lobe.
		All of these are signs of advanced cam wear, which will have to be addressed by a professional mechanic.
	www.mobil.com /USA-English/MotorOil/Car_Care/DIY/Cleaning_Dirty_Cam_Covers.aspx?pg=2 (1233 words)

	What's an overhead cam? - Chevelle Tech
		An overhead cam engine has the cam mounted in the head and not in the block (with push-rods).
		As a result, the cam (in most cases) works directly on the top of the valves.
		In some cases, there is a "bucket" between the cam and the valves that you put shims in to set valve clearance.
	www.chevelles.com /forums/showthread.php?t=2018 (317 words)

	Twin cam - Wikipedia, the free encyclopedia
		Typically, one shaft controls the exhaust and the other the intake valves.
		The most common design is the Double overhead cam or DOHC, q.v.
		This page was last modified 09:27, 24 September 2006.
	en.wikipedia.org /wiki/Twin_cam (70 words)

	HelpForCars.net: Glossary of Automotive Terms
		Older cars have the camshaft inside the engine, but newer vehicles have overhead cam designs that place the cam in the cylinder head for more efficient operation.
		An overhead cam engine has its camshaft in the cylinder head, above the valves and cylinders.
		A type of overhead cam engine with a single cam that operates both the intake and exhaust valves.
	www.helpforcars.net /Ownership/Glossary.htm (7167 words)

	1/32 Slot Cars - Monogram - Revell #4872 Acura Integra Tuner 1:32 slot car
		As part of the upscale Acura line in the US and elsewhere, the Integra was based on the Civic platform, but featured a greater level of trim.
		It also had a more powerful double overhead cam four cylinder engine and all of the Acura reputation for trouble-free service.
		This stouter powerplant is part of the reason that fans and builders of tuner type cars seek out older or wrecked Integras to scavenge the mechanicals.
	www.brshobbies.com /catalog.php/BRSHobbies/pd274040 (206 words)

	Engine swap - Honda-Acura.net
		Im thinking of dropping in 1800cc double overhead cam vtech (how many horses does this engine produce anyway).
		I also considering a1600cc double overhead cam vtech (how many horses does this engine produce anyway).
		What do I have to take into consideration, what are the draw backs and or benefits of useing one engine versus another.
	www.honda-acura.net /forums/showthread.php?t=15869 (399 words)

	Ganley Nissan, Inc. Inventory Search Results (Site not responding. Last check: 2007-10-13)
		V6, 3.5L, SOHC 24V, Automatic 4 Speed, 253 HP SAE @ 6;400 rpm, 3.5 liters V6 engine with overhead cam and four valves per cylinder, Air conditioning with climate control and rear outlet, Compass, Comp...
		L4, 2.5L, 175 HP SAE @ 6;000 rpm, 2.5 liters in-line 4 front engine with double overhead cam; variable valve timing/camshaft and four valves per cylinder, Driver and passenger front airbag with occupa...
		Automatic 5 Speed, 265 HP SAE @ 5;800 rpm, 3.5 liters V6 front engine with double overhead cam; variable valve timing/camshaft and four valves per cylinder, Active head restraints, Air conditioning wi...
	www.ganleynissan.vinmanagersites.com /InventorySearch.aspx?All=1&WebSiteID=53 (1877 words)

	Countryside Auto Center Inventory Search Results
		V8, 4.0L, Automatic 5 Speed, 281 HP SAE @ 6;100 rpm, 4 liters V8 front engine with double overhead cam; variable valve timing/camshaft and four valves per cylinder, Air conditioning with climate contr...
		L4, 1.8L, DOHC 16V, Manual 6 Speed, 1.8 liters in-line 4 front engine with double overhead cam; variable valve timing/camshaft and four valves per cylinder, 142 HP SAE @ 7;000 rpm, 6-Speed Manual Tran...
		L4, 1.9L, DOHC 16V, Turbo, Automatic 4 Speed, 1.9 liters in-line 4 engine with double overhead cam; variable valve timing/camshaft and four valves per cylinder, Air conditioning with climate control,...
	countryside.vinstickers.com /InventorySearch.aspx?All=1&WebSiteID=19 (2565 words)

	Classic Honda Inventory Search Results
		V6, 3.5L, SOHC 24V, Automatic 5 Speed, 3.5 liters V6 front engine with overhead cam; variable valve timing/camshaft and four valves per cylinder, 300 HP SAE @ 6;200 rpm, Air conditioning with dual cli...
		V8, 4.7L, Automatic 4 Speed, 4.7 liters V8 engine with overhead cam and two valves per cylinder, Air Conditioning, Cruise control, Driver and passenger front airbag, Five-door sport utility vehicle bo...
		V6, 3.5L, Automatic 4 Speed, 210 HP SAE @ 5;200 rpm, 3.5 liters V6 engine with overhead cam; variable valve timing/camshaft and four valves per cylinder, Air conditioning with climate control and rear...
	classichonda.vinmanagersites.com /InventorySearch.aspx?All=1&WebSiteID=107 (1863 words)

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