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Topic: Dual overhead camshafts

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	Howstuffworks "What does it mean when a car has dual overhead cams?"
		Generally, engines with dual overhead camshafts (DOHC) are higher performance engines, they produce more power, and can run at higher speeds.
		The main benefit of dual overhead cams is that they allow an engine to have four valves per cylinder.
		Each camshaft operates two of the valves, one camshaft handles the intake valves, and one handles the exhaust valves.
	auto.howstuffworks.com /question562.htm (430 words)

	Jeep.ca - 2007 Jeep Compass - Performance (Site not responding. Last check: 2007-10-05)
		By controlling the valves on both camshafts, the engine's timing is continuously tuned to deliver maximum power or optimal fuel economy depending upon the command being given by your right foot at that instant.
		VVT does this by altering the angular, or rotational, position of each camshaft relative to its driving sprocket (this position of a camshaft relative to its sprocket is called “indexing”).
		To make this happen, each camshaft has a solenoid-operated control valve in the cylinder head which directs oil pressure to a hydraulic actuator mounted between the nose of the camshaft and its driving sprocket.
	www.jeep.ca /en/compass/performance.html (704 words)

	Camshafts Part II - Single Overhead Cam, Dual Overhead Cam and Pushrod Engines
		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.
		The overhead camshaft, which eliminates the pushrod from the system, is one of the engine technologies that made higher engine speeds possible.
		The camshaft in a pushrod engine is often driven by gears or a short chain.
	www.streetracersonline.com /articles/camshafts/2.php (664 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.
		Dual S.U. carburetors feed the fuel mixture to the intake ports on the left side while four ports lead to four straight pipes on the right side of the engine.
		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 cam - WOI Encyclopedia Italia
		Overhead cam (OHC) piston engines place the camshaft above the cylinder heads and drive the valves or lifters directly instead of using pushrods.
		This arrangement is more complex, and relies on a timing belt or chain, but allows for greater valvetrain flexibility.
		Currently, engines have used single overhead camshafts (SOHC) or dual overhead camshafts (DOHC), which refers to the number of camshafts per cylinder bank.
	www.wheelsofitaly.com /wiki/index.php/Overhead_cam (222 words)

	DOHC (Site not responding. Last check: 2007-10-05)
		Dual overhead cams, (DOHC), refers to individual camshafts used to operate the intake and exhaust valves.
		Separate camshafts allow the use of a lightweight and compact valve actuating system which is suitable for high RPM operation.
		On Suzuki DOHC models the camshafts are turned by a chain driven by the crankshaft.
	www.stromtrooper.com /DOHC.htm (144 words)

	Ferrari Colombo engine - Wikipedia, the free encyclopedia
		It had a single overhead camshaft on each bank of cylinders with a 60° angle between the two banks.
		For 1949, the engine was further modified with dual overhead camshafts (though still two valves per cylinder) and a two-stage supercharger.
		The dual camshafts also allowed the valves to be aligned "correctly" (perpendicular to the camshaft) instead of offset as in SOHC Ferraris.
	en.wikipedia.org /wiki/Ferrari_Colombo_engine (936 words)

	TSN Saab for 1990: Engine Lineup
		Thanks to the nearly upright position of the four valves and their small faces, the engineers were able to develop a dome-shaped chamber and place the spark plug in its center.
		The engine's eight intake and eight exhaust valves are operated directly by two overhead camshafts.
		The two camshafts are driven by a roller chain with a self tensioner for long life.
	www.saabnet.com /tsn/models/1990/pr5.html (1424 words)

	Automotive Engineering International Online: NAIAS Highlights: Concepts
		The 3.5-L six-cylinder engine with dual overhead camshafts comes from the VQ series and will generate an estimated 194+ kW (260+ hp).
		The top half of the front seatbacks fold forward for easy access to the rear storage compartment, which features dual opening lids.
		The design of the new Z was an international effort, with contributions from Nissan design studios in Japan and the U.S. to a concept developed at Nissan Design America.
	www.sae.org /automag/features/naias01/zreturn.htm (207 words)

	Mopar hemi engine and Ardun heads
		The major difference between makes is the means of running the valve train; dual overhead camshafts, a single overhead camshaft, or pushrods.
		The 1906 engine had a 4.5" stroke and 5" bore with a single overhead camshaft and had one of the first water pumps driven by the fan belt.
		In the mid-1940s, he was working under contract with Ford to design an overhead valve conversion for flathead truck conversions; the heads were Hemis with two rows of rockers and plugs going through the rocker covers.
	www.allpar.com /mopar/hemi/ardun.html (2735 words)

	1995-2002 Lincoln Continental Review
		It consisted of a voice-activated cellular phone, two emergency buttons mounted in the overhead console, plus a global-positioning satellite receiver in the car's trunk.
		Notes: Engine Key: ohv = overhead valve; ohc = overhead camshaft; dohc = dual overhead camshaft; I = inline cylinders; V = cylinders in a V configuration; H = horizontally opposed cylinders; CVT = continuously variable (automatic) transmission; NA = not available; "--" = measurement does not exist.
		The Michelin MX4ZP tires are part of a system called SecuriTire that includes an overhead console lamp that lights when the pressure in any tire drops below 18 psi; it starts flashing at 10 psi in case the driver didn't notice the light.
	www.geocities.com /the95to02lincolncontinentalclub (2989 words)

	Automotive Engineering International Online: Tech Briefs (July 2000)
		The 2AZ-FE incorporates Toyota's latest engine technology, including dual overhead camshafts that are driven by a single stage roller chain of 8.0-mm (0.3-in) pitch, enabling a narrow included valve angle and compact combustion chamber shape.
		The dual overhead camshafts are driven by a single-stage roller chain of 8.0-mm (0.3-in) pitch, enabling a narrow included valve angle of 27.5°.
		The camshafts act on four valves per cylinder via bucket tappets.
	www.sae.org /automag/techbriefs_07-00/05.htm (555 words)

	1ZZFE Engine Details (Site not responding. Last check: 2007-10-05)
		In the United States, two versions of the ZZ-series 1.8-liter inline four-cylinder engine with dual overhead camshafts and four valves per cylinder have replaced the 3S-series 2.0-L (Japanese) and 2.2-L (U.S.) engines in the previous-generation Celica.
		Dual overhead camshafts are driven by a single-stage silent chain of 8.0-mm (0.3-in) pitch in both engines.
		The 1ZZ-FE's camshafts act on four valves per cylinder via shimless bucket-type tappets.
	www.spyderchat.com /enginedetail.htm (786 words)

	KRC Performance Online (Site not responding. Last check: 2007-10-05)
		This grind is specific with negative 9 degrees of overlap, and tighter exhaust to spool up the turbo quicker at a lower rpm and run to max rpms of 6800.
		We have run at 111mph in the quarter with only 9 psi using this camshaft.
		The KRC 210 camshaft with KRC Performance 2.02 R/T ported heads, M-1 2bbl intake, 52mm CNC throttle body, PPH full length headers, Mopar PCM, MSD Ignition system, will produce 430 horsepower on the 360 with 310 at the rear wheels with proper tuning.
	www.krcperformance.com /newcontent/cams.html (1478 words)

	GMInsideNews - Engine Guide
		Configuration: Dual Overhead Camshaft (4 valves per cylinder).
		Configuration: Dual Overhead Camshafts (4 valves per cylinder).
		Configuration: single overhead camshaft (4 valves per cylinder).
	www.gminsidenews.com /index.php?page=Engine_Guide (365 words)

	LISTSERV 14.4
		The three types of blowers are: piston-cylinder type; positive rotary; Roots and vane types; and centrifugal types.
		A dual set-up can be used on a four-cylinder, six-cylinder, or eight-cylinder engine.
		Types of camshafts for hot rods consist of the following: stock, semi-race, 3/4-race, super, and full-race.
	listserv.linguistlist.org /cgi-bin/wa?A2=ind0303e&L=ads-l&P=449 (1050 words)

	2007 HUMMER H3 Overview - GM Canada (Site not responding. Last check: 2007-10-05)
		Dual overhead camshafts, aluminum engine block and head, variable exhaust valve timing and dual internal balance shafts are a few of this engine's advanced features.
		The H3's standard two-speed, electronically controlled, full-time 4WD system is paired with a state-of-the-art traction control system (TCS) to take you places most SUV owners couldn't dream of going.
		All seats feature dual density foam and soft bolsters for added comfort and support during off-road manoeuvres.
	www.gmcanada.com /english/vehicles/hummer/h3/index.jsp (592 words)

	Buy a New, Used Car, Truck or SUV, Get Prices and Kelley Blue Book Values at BeepBeep.com, Time Warner Cable: 2005 ...
		A 185-horsepower, 3.4-liter V6 with an iron block and pushrod overhead valves is standard on all but Ultra.
		A 242-horsepower, all-aluminum 3.6-liter V6 with dual overhead camshafts (DOHC) and variable valve timing (VVT) is standard on Ultra and optional ($2,025) on CXL and CXL Plus.
		The 3.6-liter V6 is an entirely new engine, with all-aluminum construction and dual overhead camshafts.
	www.beepbeep.com /global/story.asp?s=2969668 (2496 words)

	Chevy Colorado: pickup in the middle \| The San Diego Union-Tribune
		Engine: 220 hp, 3.5 liter inline five cylinder with dual overhead camshafts, continuously variable exhaust valve timing, variable exhaust cam phasing, 4 valves-per-cylinder, with dual balance shafts; 225 foot-pounds of torque at 2,800 rpm,
		There are lots of stash zones – door pockets, console trays, 2-level center console armrest – and dual power plugs for phones and other conveniences.
		Both engines are technology rich with dual overhead camshafts, continuously variable exhaust valve timing, variable exhaust cam phasing, four valves-per-cylinder and dual balance shafts.
	www.signonsandiego.com /uniontrib/20040522/news_lz1d22chevy.html (694 words)

	Ecotec 2.0L I-4 Supercharged
		The design of the new 2.0L Ecotec SC is based on the highly successful 2.2L normally aspirated Ecotec, with features such as four valves per cylinder, maintenance-free, chain-driven dual overhead camshafts, counter-rotating balance shafts, and an integrated oil cooler.
		Dual balance shafts, housed in the cylinder block, provide smooth and quiet engine operation by offsetting the vibrations inherent in an inline 4-cylinder engine.
		Sodium-filled exhaust valves have stems that are filled with a sodium compound that becomes liquid at normal operating temperatures.
	www.gmtunertour.com /index.asp?section=B592A7DF2B4D41A78CF337DADAFAA851&page=17D84DCE67104F66BF9AF018C0C5EBF9 (641 words)

	The Fort Collins Coloradoan cars.com:
		The rotating camshaft operates the intake and exhaust valves that control the intake of air for combustion and the expulsion of the resulting exhaust gases.
		The V designation may be based on the angle of one bank of cylinders relative to the other, but I don’t think of the VR6 as having two banks.
		In either head, 15 degrees separates two cylinder pairs, and there’s roughly 72 degrees between the centers of the two heads (see a diagram comparing V-8 and W-8 configurations).
	www.cars.com /carsapp/colorad/?srv=parser&act=display&tf=/features/mvp/volkswagen/passat/passat_w8.tmpl (2658 words)

	1996-2002 Toyota 4Runner Prices & Review (Site not responding. Last check: 2007-10-05)
		On sale in March 1996, 4Runner shared powertrains and some chassis elements with the Tacoma pickup, but styling, wheelbase, rear suspension, and interior design differed.
		Dual airbags were standard, along with 4-wheel antilock brakes and side-impact door beams.
		Wheelbase was two inches longer, door width grew by 1.5 inches, rear leg room was up three inches, and the floor was lowered by 2.4 inches.
	auto.consumerguide.com /Auto/Used/reviews/full/index.cfm/id/2243/... (999 words)

	KRC Performance Online (Site not responding. Last check: 2007-10-05)
		Wake up the sleeping horses in your 4.7L Dodge truck with these high output overhead camshafts.
		The kit includes both left and right camshafts, the installation tool, tech support and full instructions for a 4 hour job.
		Don't be fooled by cheaper copies of the original dyno testing developed at KRC Performance.
	www.krcperformance.com /newcontent/47page.html (806 words)

	Ferrari 250 Testa Rossa - Supercars.net
		It was powered by a large-displacement V12 engine, having dual overhead camshafts.
		Before the 335, Ferrari had explored many different engine configurations, including Inline 4s and 8s in hopes of achieving greater reliability, but it was discovered that the well-balanced V12 was superior when it came to winning races.
		The team cars, which ran exclusively for Ferrari, were upgraded to include a De Dion rear axle, an all enveloping body and host of other modifications.
	www.supercars.net /cars/525.html (951 words)

	Honda Motorcycles
		In marked contrast to modern high-performance four-stroke motorcycle engines, the RC143's 44mm bore and 41mm stroke described cylinders that were only slightly oversquare.
		Its dual overhead camshafts were prophetic of modern racing technology, using gear drive to maintain accurate valve timing all the way to 14,000 rpm.
		A pair of ubiquitous piston-valve carburetors fed the eighth-liter screamer, while its oil lived in a wet sump.
	powersports.honda.com /the_story/heritage/heritage_milestone.asp?Decade=1960&TargetUrl=Milestone/Milestone_Model_0083.asp&PrevPageTitle= (508 words)

	The Nissan Altima has moved up - The Sentinel, August 2002 (Site not responding. Last check: 2007-10-05)
		The 3.5-liter 240-horsepwer V6 has dual overhead camshafts and 24 valves.
		It propels the Altima to 60 mph from a standing start in about 7 seconds, making it one of the fastest midsize family sedans.
		The 4-cylinder also is sophisticated, with dual overhead camshafts, four valves per cylinder and variable valve timing for better response.
	www.valleysentinel.com /archive/2002/200208/auto/altima.htm (529 words)

	Car Prices and Research - 2002 Dodge Intrepid New Car Test Drive (Site not responding. Last check: 2007-10-05)
		Powering the SE is a 200-horsepower, 2.7-liter V6 with dual overhead camshafts.
		Both ES and R/T are powered by a 3.5-liter V6 with single overhead camshafts.
		This engine produces 234 horsepower in the ES, but 244 in the R/T, thanks to a dual-path intake manifold and a less restrictive performance-tuned exhaust.
	autosite.com /content/research/index.cfm/action/showarticle/AID/137987 (1330 words)

	Dual overhead camshafts explained
		CATEGORIES (articles) > Engines > Technical > Dual overhead camshafts explained
		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.
		While the technology was used at first in limited production and sports cars, the Fiat group is historically credited as the first car company to use a belt driven DOHC engine across their complete product line, comprised of coupes, sedans, convertables and station wagons, in the mid-1960's.
	www.kitcarusa.com /kb.php?aid=65 (602 words)

	1975 Chevrolet Cosworth-Vega Engine (Site not responding. Last check: 2007-10-05)
		The Cosworth-Vega engine program was a project started by 1970's Chevrolet General Manager John DeLorean to improve the image of the Vega.
		The idea was to adapt Cosworth Engineering's 4-valve per cylinder/dual overhead camshaft racing head to the stock Vega aluminum block, and add quality internal engine components to make a state-of-the-art high performance 4 cylinder engine.
		Early prototypes quoted horsepower ratings in the 200-240hp range, which would have been fantastic.
	www.sd455.com /index/vegaeng.htm (129 words)

	2006 Hummer H3 Preview
		Hummer also promises that the 2006 Hummer H3 will perform on par with the fuel-thirsty V8-powered H2 while achieving as much as 20 mpg on the highway.
		Under the H3's squared-off hood resides a Vortec 3500 engine with dual overhead camshafts, variable valve timing, and drive-by-wire throttle control.
		This is the same 3.5-liter inline five-cylinder engine from the Chevy Colorado and GMC Canyon that has underwhelmed critics who complain that the motor delivers sluggish response off the line.
	www.autosite.com /content/shared/articles/templates/index.cfm/article_page_order_int/2/article_id_int/242 (245 words)

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