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Topic: Engine knocking

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	Engine knocking - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07)
		Knocking (also called pinking or pinging) in internal combustion engines occurs when fuel in the cylinder is ignited by the firing of the spark plug but burns too quickly, combusting completely before the optimum moment during the compression phase of the four-stroke cycle.
		Knocking can typically be prevented by the use of higher octane gasoline, the addition of octane-increasing "lead" or isooctane additives to the gasoline, reduction of in-cylinder temperatures (such as through cooling or compression ratio reduction), or retardation of spark plug ignition.
		Pre-ignition is caused by heat buildup in engine components or overheating of the air-fuel mixture during compression, and cannot be prevented by delaying spark plug firing.
	www.encyclopedia-online.info /Engine_knocking (309 words)

	Engine knocking - Wikipedia, the free encyclopedia
		It is caused by an instantaneous ignition of the remaining fuel/air mixture in the form of an explosion.
		Modern automotive and small-boat engines have sensors that can detect knock and delay the spark plug firing to prevent it, allowing engines to safely use petrol of lower octane ratings, with the consequence of reduced power and efficiency.
		A knock sensor consists of a small piezoelectric microphone on the engine block, connected to the engine's electronic control unit.
	en.wikipedia.org /wiki/Engine_knocking (548 words)

	Engine knocking (Site not responding. Last check: 2007-11-07)
		Knocking (also called pinking or pinging) in internal combustion engines occurs when fuel in the cylinder is ignited by the firing of the spark plug but burns too quickly, combusting completely before the optimum moment during the compression phaseof the four-stroke cycle.
		Knocking can typically be prevented by the use of higher octane gasoline, the addition of octane-increasing "lead" or isooctane additives to the gasoline, reduction of in-cylinder temperatures (such as through cooling or compression ratio reduction), or retardation of spark plug ignition.Correct ignition timing is essential for optimum engine performance and efficiency.
		Pre-ignition is caused by heat buildup in engine components or overheating of the air-fuelmixture during compression, and cannot be prevented by delaying spark plug firing.
	www.therfcc.org /engine-knocking-19838.html (289 words)

	Engine knocking -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-11-07)
		Retardation of spark plug (The mechanism that ignites the fuel in an internal-combustion engine) ignition.
		These knock sensors work by using a small (Click link for more info and facts about piezoelectric) piezoelectric microphone connected to the ecu.
		Heat can buildup in engine intake or cylinder components due to improper design or maintenance, or overheating of the air/fuel mixture during compression.
	www.absoluteastronomy.com /encyclopedia/e/en/engine_knocking.htm (477 words)

	Encyclopedia: Engine knocking (Site not responding. Last check: 2007-11-07)
		A colorized automobile engine An internal combustion engine is a sexy engine that is powered by the expansion of hot combustion products of fuel directly acting within an engine.
		The fuel/air mixture is normally ignited slightly before the point of maximum compression to allow a small time for the flame-front of the burning fuel to expand throughout the mixture, so that maximum pressure occurs at the optimum point.
		A sensor is a technological device or biological organ that detects, or senses, a signal or physical condition and chemical compounds.
	www.nationmaster.com /encyclopedia/Engine-knocking (1003 words)

	Howstuffworks "What does octane mean?"
		One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug.
		The compression ratio of your engine determines the octane rating of the gas you must use in the car.
		One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio.
	auto.howstuffworks.com /question90.htm (606 words)

	Engine knocking
		Knocking or pinging in internal combustion engines occurs when the fuel ignites before the spark occurs at maximum compression.
		Knocking can typically be prevented by higher octane gasoline, reduction of in cylinder temperature (cooling or compression reduction), or the addition of "lead" to the gasoline.
		To the driver, knocking can be detected as "knocking" or "pinging" noise during hard acceleration.
	www.fastload.org /en/Engine_knocking.html (125 words)

	AAA : Your Car : I hear a knocking noise in my engine. Should I be concerned? (Site not responding. Last check: 2007-11-07)
		Knocking noises are usually caused by two parts banging against each other that shouldn't bang together.
		If the engine oil was not low, you may have a problem with oil pressure.
		There are knocking noises that are not as critical, but the difference between a noise that is a major problem and a noise that is a minor problem is so subtle that only a trained professional technician can tell the difference.
	www.csaa.com /global/faqdetail/0,1397,1004010401\|214,00.html (245 words)

	Engine Knocking (Service Dept, Aug 03)
		In the old days, engine manufacturers allowed you to mix a small amount of water into the top end of our engine through a control valve.
		It is most certain that after an engine rebuild you have to do this once, if not twice, to get the head to seat properly.
		As you said, the engine was recently rebuilt by Lou down in Milwaukee.
	www.acbs-bslol.com /Gadgets/Knocking.htm (1178 words)

	KNOCKING - Definition (Site not responding. Last check: 2007-11-07)
		[n] the sound of knocking (as on a door or in an engine or bearing); "the knocking grew louder"
		repeated knockings of the head upon the ground by the Chinese worshiper.
		Hearing knocking in your dreams, suggests that your unconscious is trying to attract your attention to some aspect of yourself or to some waking situation.
	www.hyperdictionary.com /dictionary/knocking (72 words)

	Club RSX Message Board - Engine Knocking
		I think it sounds as if it is, when the engine is at low revs in high gear, and a lot of gas is applied.
		The computer on the engine would retartd the timing to keep the engine from knocking.
		When i stated that all hondas knock i was referring to the valves.
	forums.clubrsx.com /showthread.php?t=2397 (1022 words)

	Engine Knocking (Site not responding. Last check: 2007-11-07)
		established credentials with Super Bowl victories, and the Eagles knocking, knocking at the...
		Doody said the engine was led by Captain Ed Freitas along with firefighters Sam Poch and Brian...
		fuel in a high-compression engine can result in the gas igniting during compression, not by the spark plug, which is what engine âknockingâ is, which can...
	engine-knocking.wikiverse.org (449 words)

	Diesel Engine Diagnostics DEET 5
		The most common reason for white smoke are in-operative glow plugs low engine compression, a bad injector spray pattern, late injection timing or injection pump problems.
		Excessive blue smoke indicates problems from low engine compression and/or worn piston rings, scored cylinder walls or leaking valve stem seals The blue smoke is caused by crankcase oil entering the combustion chamber and being emitted after partial combustion through the exhaust
		This rapid combustion produces very high pressures generating a rumble or dull clattering sound Abnormally loud "knocking" may be due to diesel engine miss.
	www.peemac.sdnpk.org /resource/fert/tips5.html (961 words)

	Automotive Forums .com Car Chat - 2002 Toyota Tacoma 4 cyl engine knocking
		Mine is a 2003 2.7L 4x4 and it makes a deep knocking or thudding noise prevalent between 1800 and 2000 rpm under light to moderate loads.
		I am wondering if the clutch and engine noise issues are related perhaps as you mention something to do with the crankshaft end thrust.
		The engine has 1100 miles on it and the engine noise seems to be louder that when brand new.
	www.automotiveforums.com /vbulletin/t31554.html (2043 words)

	2002 Toyota Tacoma 4 cyl engine knocking - Tacoma - Car Discussion Forums - Helping the Automotive Community Online
		The solution to the problem is having the engine scoped and look for the carbon, IF ANY, and then what they do is somtimes rev the engine until the knock stops, or to place solvent, such as gum out, to break up the carbon.
		Another thing that he said the knocking noise could be due from the engine balancer weight, which lies under the oil pan when its removed.
		I have just brought my 2002 tacoma 4x4 with 4 cylinder engine in to the dealer for the second time for an inceasingly louder knocking sound, especially when the truck is started cold, but it is also audible at cruising speeds.
	www.automotivehelper.com /topic31554.htm (5565 words)

	Bad Cat Converter And Engine Knocking - Volvospeed Forums
		Is it possible that knocking is caused by the bad cat as perhaps it is partially obstructed, thus affecting not only exhaust itself but the readings of the two oxygen sensors?
		As I had an episode of floodind the engine with gas after I inadvertently let water accumulate on the spark plug housings after washing the engine (It would not start, and I unfortunately only figured it out when idecided to check the plugs for spark), I kind of expected to have a cat problem.
		The engine knocking has been there for some time, and it disapears when I use high octane.
	www.volvospeed.com /vs_forum/index.php?showtopic=9211 (528 words)

	Engine knocking noise - suggestions please - Cherokee - Automotive Forums .com Car Chat- A Message Board for Every Make ... (Site not responding. Last check: 2007-11-07)
		I did an engine flush and fresh oil change at 121000 miles and added the STP oil addititive (blue bottle) but there was absolutely no change in the level of knocking.
		Knocking from beneath the engine at idle, after it warms up.
		engine componants that can be effected by other causes and problems with the engine.
	www.automotiveforums.com /t12467.html (1748 words)

	Two Guys Garage Forum - Engine is Knocking
		You can hear it in the engine compartment but to me it is more pronoucned under the truck.
		So I went back with the scope over the whole engine and when I put it on the timing chain cover it was loud!!!!!.
		Engine miss/backfire in 1989 Ford 302 in an econoline 150
	www.twoguysgarage.com /forum/showthread.php?t=193 (635 words)

	A critique of port knocking - Search Engine Optimization, Google Optimization
		knocking is a method of "message transmission across closed ports." It works like this: initially a firewall blocks all ports on the server.
		The client issues a series of connection requests (knocks) to different ports; these are, of course, dropped since the ports are blocked.
		However, there is a daemon that monitors the log files for connection requests, and the sequence of requests serves as an encrypted code.
	www.seochat.com /showblog/638/A-critique-of-port-knocking (658 words)

	NAXJA Forums -::- North American XJ Association - front of engine knocking (Site not responding. Last check: 2007-11-07)
		The 4.0 in line six is known for having "piston slap", where the piston knocks against the cylinder bore slightly.
		The front engine knock is a much deeper sound and comes from lower on the block.
		Another knocking that falls just about in the same frequency range as piston slap is a bad water pump.
	www.naxja.org /forum/showthread.php?t=7987 (599 words)

	DiscoWeb Message Boards - Loud knocking sound, new engine and still knocking
		Hello, my 95 disco had a rather loud knocking sound which sounded like it was coming from the bottom end of the engine, so i replaced it with a 4.0 short block.
		The truck is still making the knocking sound even with teh new engine, so i guess it wasnt the engine knocking.
		The knock was soo loud and consistant that i figured it had to be a rod knock.
	www.discoweb.org /forums/printthread.php?t=443 (1762 words)

	Engine Knocking, 94 850 Na - Volvospeed Forums
		3-Remove the intake manifold and check if the knock sensors are properly torked and connected, even though I have not gotten any codes related to them.
		There are no leaks in the exhaust manifold, engine runs OK, starts Ok and performance is OK. But the knocking is there.
		Usually the knocking is heard when going uphill, particularly in first or second gear.
	www.volvospeed.com /vs_forum/index.php?showtopic=11575 (856 words)

	RV.Net Open Roads Forum: Tow Vehicles: Diesel engine knocking sound while accelerating?
		If you are hearing the knock from the engine under acceleration, it could be from an over-fueling injector, especially if it comes from one bank and not the other.
		If the sound is only under acceleration, there may by something on the engine, like an exhaust manifold, hitting the frame or engine enclosure.
		This would be due to sagging rubber engine mounts and the engine moving in them at high torque output.
	www.rv.net /forum/index.cfm/fuseaction/thread/tid/13398866.cfm (382 words)

	Consumer complaints about GMC Yukon - Engine Noise (Site not responding. Last check: 2007-11-07)
		The Yukon is one of the trucks GM has been quietly buying back because of engine noises that experts say are "piston slap," one of those things that only gets worse with time.
		The service tech told me that the knocking noise was “normal” for the 2002 engines and that it did not affect the performance in anyway.
		He explained that this was a problem with the 2002 engines and drew a picture of the pistons to explain why the noise occurs.
	www.consumeraffairs.com /automotive/gmc_yukon_engine.html (853 words)

	Engine Knocking HELP!! - MINI2
		I purchased my '05 MCS in Nov of '04 and since then it has developed an engine knocking noise over the last 3 weeks or so and it seems to be getting worse as the time goes on.
		I sat in it and gave the pedal a few revs and it seemed to be a louder and quicker knock.
		I have not heard the knock up until about 3 weeks ago and I was wondering if anyone else has had this problem or does anyone know what this could be.
	www.mini2.com /forum/archive/index.php/t-86296.html (1275 words)

	Corral Forums - engine knocking sound?? (Site not responding. Last check: 2007-11-07)
		First off I would like to say I have been reading the great information that is on this forum for a while and have never posted until now hopeing you guys can help me out with this problem I have that said heres the story.
		Well at least its in storage for the winter, but would really like to figure this out before spring but thats really going to suck if I have to pull the motor and buy a new shortblock.
		I noticed a knocking sound somewhere between 1,000-2,000 RPM in first gear.
	www.corral.net /forums/showthread.php?t=214505 (486 words)

	SVTPerformance - 05 GT engine knocking!!! (Site not responding. Last check: 2007-11-07)
		Had the same issue with my 01 GT and they found out it was a rod knock.
		I was about to by an 05 GT and it had a horrible sound like that coming from the engine.
		He explained the cam chain tensioner set up to me. The cam chain tensioners are pressured by engine oil in a small cylinder and sometimes they stick closed.
	www.svtperformance.com /forums/showthread.php?goto=newpost&t=205424 (546 words)

	RE: Engine Knocking Question (Site not responding. Last check: 2007-11-07)
		That would require blueprinted engines which these are not.
		The sound, which most everyone thinks is >pre-detonation, comes generally when I am working the engine harder (such as >autocrossing) and when it is hot.
		I, too, am having a bit of pinging on HOT days when the engine is under some load (hills).
	list.miata.net /1997-07/563.html (279 words)

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