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Topic: Pushrod engine

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	A Pushrod Length & Rocker Arm Geometry "Must Read"
		As much as we would like to sell you pushrods at this time, nobody can predict ahead of time what length a given engine needs, unless it is bone stock.
		Therefore, the radius at either end is complete, which lengthens the pushrod approximately.017" in the case of a 5/16" pushrod with.100" diameter oil holes, minimally chamfered.
		We’ve developed three techniques to help you determine exactly how long the pushrod is that you so diligently played with until the perfect valve train geometry was achieved in your engine.
	www.compcams.com /information/Products/Pushrods (1170 words)

	PUSHROD ENGINE : Encyclopedia Entry
		Pushrod engines are perceived to be "old fashioned" by the modern automotive press.
		OHC engines were developed as more expensive high-performance engines and have largely replaced the pushrod design in countries where cars are taxed based on engine displacement.
		Modern pushrod engines generally rev to 6,000 rpm: compare this to modern OHC engines that can easily rev from 7,000 rpm in average engines to near 20,000 rpm in Formula One racing engines.
	www.bibleocean.com /OmniDefinition/Pushrod_engine (0 words)

	Pushrod engine - Definition, explanation
		Pushrod engines are maligned as "old fashioned" by the modern automotive press.
		The cause is historical: The OHV engine came first while OHC engines were developed as more expensive high-performance engines and have largely replaced the pushrod design, particularly in countries where cars are taxed based on engine displacement.
		Compare this to modern OHC engines that rev to 7,000 rpm in the case of ordinary engines, to 9,000 rpm in the case of high-performance engines like the one used in the Honda S2000, and even higher in specialty engines (Radical Motorsports engines are capable of revving past 10,000 rpm).
	www.calsky.com /lexikon/en/txt/p/pu/pushrod_engine.php (0 words)

	Pushrod - WOI Encyclopedia Italia
		The cause is historical: The OHV engine came first while OHC engines were developed as more expensive high-performance engines and have largely replaced the pushrod design, particularly in countries where cars are taxed based on engine displacement.
		Compare this to modern OHC engines that rev to 7,000 rpm in the case of ordinary engines, to 9,000 rpm in the case of high-performance engines like the one used in the Honda S2000, and even past 10,000 rpm in specialty engines.
		These engines combined much of the performance of the overhead camshaft with the ease of service of the pushrod, but were more expensive to manufacture than either competing design.
	www.wheelsofitaly.com /wiki/index.php?title=Pushrod&redirect=no (852 words)

	The Pushrod Engine Finally Gets its Due. - Columns - Car and Driver May 2004
		A pushrod is basically a metal tube designed to transfer the reciprocating motion of a valve lifter, riding on the camshaft, to the valve.
		The pushrod was the scapegoat for all that was wrong with Detroit.
		In the '80s, the pushrod was a hated component, a symbol of the uncompetitiveness of the domestic industry," says Sam Winegarden, GM's chief engineer for small-block V-8s.
	www.caranddriver.com /columns/8025/the-pushrod-engine-finally-gets-its-due.html (725 words)

	Pushrods & Lifters, Brendan Baker, Engine Builder, April 2006
		Most of the pushrod and lifter suppliers we interviewed agreed that pushrod engines are going to be around in one form or another for quite some time.
		In many cases, OHV engines, where the camshaft is below the piston and pushrods actuate lifters or “tappets” above the cylinder head to operate the valves, are less expensive to manufacture than an OHC engine.
		This is because the newer pushrod engines have steel roller cams that don’t wear, and they’ve got hydraulic roller lifters that don’t go bad at the same rate as the flat tappet components.
	www.automotiverebuilder.com /ar/eb40644.htm (3049 words)

	CanadianDriver: Auto Tech - Pushrods vs overhead cams - which is better?
		Pushrods are slim metal tubes with rounded ends that pass through holes in the cylinder block and head and move the rocker arms.
		While pushrod engines can use gears or short chains because the camshaft is close to the crankshaft, overhead camshaft engines typically use long roller chains for each bank or a single toothed timing belt.
		Cylinder head ports or passages on pushrod engines are always a compromise because the ports have to be placed to allow room for pushrods to pass though the head.
	www.canadiandriver.com /articles/jk/040421.htm (0 words)

	Tools for repairing a diesel engine cylinder head - Patent 4638541
		After the pushrod and spring assembly and the cam follower are removed from the bore, the lower element 20 is inserted in the bore with the lower surface 29a contacting the base circle of a cam lobe.
		Before the cam follower and pushrod spring assembly are inserted into the cam follower bore, the adjustment element 53 is rotated so that the pins 55 are located below the lower surface 51a of the core element and a snap ring is compressed and mounted on the pins 55.
		The composite wrench of the present invention is used to adjust the valve clearance and fuel injector clearance for a Detroit diesel engine by allowing the operator to simultaneously grasp the flats of the pushrod and the pushrod lock nut.
	www.freepatentsonline.com /4638541.html (0 words)

	Reference.com/Encyclopedia/Overhead valve
		In an OHC engine, the camshafts are normally part of the cylinder head assembly, while in an I-head engine the camshaft (rarely more than one) is part of the main engine block assembly.
		General Motors is the world's largest pushrod engine producer with engines such as the 3800 Series III Supercharged V6 (260 hp, 280 lbf·ft torque), LS7 Chevrolet Corvette 7.0 L V8 Engine (505 hp, 475 lbf·ft torque) and LS4 5.3 L DOD V8 (303 hp, 323 lbf·ft torque).
		Today the technology is widespread, and the term, "OHV", is generally used to differentiate a pushrod engine from one which uses overhead cams, although both types employ overhead valves and so are both OHV engines.
	www.reference.com /browse/wiki/Pushrod (0 words)

	Engine Design
		Real engines actually have some overlap in the cycles in order to improve performance and account for the acceleration and deceleration of the air/fuel mixture as it moves in and out of the cylinders.
		The engine block is the big chunk of metal that holds everything together and forms the core of the engine.
		To reduce this, the engine is “balanced” by actually measuring the weight of the different pieces and shaving a little metal off here and there until the weight of the pistons and rods match as close as possible.
	www.jaytorborg.com /engine_design.htm (9007 words)

	Why is the pushrod 'obselete'? - MX6.com
		The camshaft pushes the lifter, the lifter pushes the pushrod, the pushrod pushes the rocker arm, the rocker arm "rocks" and pushes the valve stem, which opens the valve.
		Pushrods can flex and bend and so on, and even though that flexing is undetectable to the naked eye (unless something goes horribly wrong), it still takes away from the predictability of the valve's motion, which makes fine-tuning the engine more difficult.
		Obviously, I still love pushrod engines, and Wyldeone already made a great case for why they aren't "obsolete," but an engine with overhead cams should generally be superior to an exactly identical engine with the cam in the block.
	www.mx6.com /forums/showthread.php?t=91482 (1560 words)

	VALVETRAINS: Better Materials & Design, Larry Carley, Automotive Rebuilder, November 1997
		Pushrods would seem to be an endangered species these days, at least as far as most new engine designs are concerned.
		The new pushrod engines were more powerful than their flathead counterparts because the placement of the valves over the combustion chamber allowed the engine to breathe more efficiently.
		Increasing the redline on a pushrod engine requires the use of much stiffer springs, which increases friction, wear and the risk of breakage in the valvetrain.
	www.babcox.com /editorial/ar/ar119736.htm (3175 words)

	Pushrod vs DOHC - Automotive Forums .com Car Chat
		Pushrod engines are lighter, are less complicated, have less valvetrain friction and less moving parts.
		Assuming you're comparing similar engine setups (2-valve per cylinder), a pushrod engine would have fewer camshafts, but add in the additional hardware that moves the valves and you'll have more parts in the OHV engine.
		In the late 1980s, Lotus was developing a DOHC setup for the Corvette engine but it proved too wide to fit in the engine bay of the car (Corvette's get their engines from the bottom and the engine wouldn't fit between the frame rails).
	www.automotiveforums.com /vbulletin/t109265.html (2645 words)

	Finding Proper Pushrod Length - Circle Track Magazine
		The engine still runs and the power seems to be OK. Yes, it might be in the beginning, but improperly sized pushrods-especially in an engine equipped with roller-tipped rockers-can be disastrous.
		The pushrod's collapsed length is marked, so after you find the correct size, simply count the number of revolutions the pushrod has been expanded and you will know the right size to order the actual pushrods.
		With the lifter on the base circle of the cam, install either a pushrod that you think is the best length or a checking pushrod and the rocker arm, and then zero out the lash (or if you are using a hydraulic lifter, tighten to the recommended preload).
	www.circletrack.com /techarticles/ctrp_0609_pushrod_length (1218 words)

	OHV, OHC, SOHC and DOHC (twin cam) engine - Automotive illustrated glossary
		OHV means OverHead Valve - an engine design where the camshaft is installed inside the engine block and valves are operated through lifters, pushrods and rocker arms (an OHV engine also known as "Pushrod" engine).
		In the SOHC engine the camshaft is installed in the cylinder head and valves are operated either by the rocker arms or directly through the lifters (as in the picture).
		Compare: The 3.5-liter V6 DOHC engine of 2003 Nissan Pathfinder has 240 h.p, similar to 245 h.p of the 5.9-liter V8 OHV engine of 2003 Dodge Durango.
	www.samarins.com /glossary/dohc.html (341 words)

	DOHC, SOHC, and Pushrod Engines
		Chevrolet is sticking with the pushrod engine because they also tend to be smaller.
		Another reason is that engineers tend to stick with the tried and true.
		If you look at a flat-head engine, the camshaft is in the same place as it is in a pushrod engine.
	www.allpar.com /eek/cams.html (844 words)

	Pushrod_Info
		Because a pushrod is an eccentrically loaded column due to angularity load and arc motion within the engines atmosphere, whenever possible, it is most proper to use either a single taper or offset dual taper design pushrod.
		This is because the pushrod is on the slow moving side of the valve train.
		Improper pushrod length can cause a number of problems including excessive valve guide wear, lessened valve lift, valve stem side thrust, coil bind, improper valve to piston clearance and also rockerarm to retainer interference (in some cases lash caps can be used to help correct rockerarm to retainer clearance problems).
	www.mantonpushrods.com /Pushrod_Info.html (745 words)

	The Auto Prophet: The Redemption of the Pushrod?
		The 300C with HEMI is a pushrod, and it is the media darling.
		Bottomline there is an advantage to OHV, and to OHC engines but I am sure if the boys at GM put their minds to it they could make a OHV rev at 20,000 rpm and make 1,900 hp and it could survive that abuse.
		It is just a matter of Engineering you parts to survive the vibration factor in a V-8 which continues to worsen through out the rev band but fixing it could come through counter balancing the crankshaft and adding/ subtracting weight to areas that need more/ less weigh.
	theautoprophet.blogspot.com /2005/06/redemption-of-pushrod.html (4046 words)

	GM LS engine - Wikipedia, the free encyclopedia
		It is an all-aluminum 5.7 L (346 in³) pushrod engine and was rated between 288 - 350 hp (212 to 261 kW) and 325-365 ft·lbf (439-498 N·m) of torque in North America, depending on the application.
		A 3-valve per cylinder design was originally slated for the LS7, which would have been a first for a pushrod engine; but the idea was shelved owing to design complexities and when the same two-valve configuration as the other Generation III and IV engines proved to be sufficient to meet the goals for the LS7.
		During GM's reliability testing of this engine in its prototype phase, the LS7 was remarked to have been repeatedly tested to be 8000 rpm capable, although power was not made at that rpm level, due to the restraints of the camshaft's profile and the intake manifold ability to flow required air at that engine speed.
	en.wikipedia.org /wiki/GM_LS_engine (1744 words)

	Camshafts Part II - Single Overhead Cam, Dual Overhead Cam and Pushrod Engines (Site not responding. Last check: )
		These springs have to be very strong because at high engine speeds, the valves are pushed down very quickly, and it is the springs that keep the valves in contact with the rocker arms.
		The key difference is that the camshaft on a pushrod engine is inside the engine block, rather than in the head.
		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)

	Katech Engine Development - Street Performance
		With an 8000rpm redline, this crate engine is ideal for that "sleeper" ride.
		Drawing from over two decades of experience with championship winning pushrod V8s, this package is race ready.
		Circle track 350/400 base engine prepared to ASA Late Model Series specifications, sealed and dyno validated.
	www.katechengines.com /street_performance/engine_packages.php (425 words)

	Engine - General
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	www.type2.com /library/engineg.htm (186 words)

	GM FastLane Blog: Auto Prophet Defends Pushrods
		You can hawk the merits of pushrod engines until the cows come home, but I'm pretty sure that a car owner prefers to have his or her senses rewarded, not offended.
		The engine with the flexifuel (E85) version which is being used in the GMC Sierra 2006 would be perfect for the Swedish market if GM take the descision to take the 9-7x to Europe.
		The 3800 is an excellent engine and the minor improvements and upgrades as it ascended from Series one to two and so on are welcome and they need to be kept refined every once in a while.
	fastlane.gmblogs.com /archives/2005/06/auto_prophet_de.html (0 words)

	Celebrating 50 years of Chevy V8 Small Block Power: 1955-2005, Larry Carley, Tomorrow's Technician, October 2005
		Though the engine only displaced 265 cubic inches and came with a two-barrel carburetor giving it 162 horsepower, it was obvious the engine had serious performance potential.
		A pushrod engine with two valves per cylinder develops good torque at low rpm and cost much less to build than an engine with overhead cams and three or four valves per cylinder.
		The pushrod engine, at least in GM's opinion, remains the "bread-and-butter" engine for the masses.
	www.tomorrowstechnician.com /tt/tt100526.htm (1987 words)

	Making Modern Horsepower the Old-Fashioned Way - New York Times
		Instead, they learned, the monstrous Viper engine would continue to breathe through two valves in each cylinder, and those valves would still be opened by pushrods, a venerable mechanism that has all but vanished from modern cars.
		Pushrod engines, notably V-8’s, can fit in spaces that may be too small for an overhead cam design.
		Pushrod V-8 engines racing in Nascar routinely rev to 9,000 rpm.
	www.nytimes.com /2007/01/14/automobiles/14VIPER.html?ex=1326430800&en=62440ed6db7a442c&ei=5088&partner=rssnyt&emc=rss (1249 words)

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