Chamber Mufflers Pair

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Chamber Mufflers Pair
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Together, your intake and exhaust valves play a critical role in the operation of your engine. Each cylinder has at least one pair. During the first stroke of the combustion process, the intake valve (IV) opens to allow fuel and air into the combustion chamber. When the chamber is full, the valve closes and completely seals the opening. A tight seal is important because it allows the air-fuel mixture to be compressed for ignition.

After the mixture has been ignited, vapors expand rapidly and push the piston to the bottom of the chamber. The cylinder's exhaust valve (EV) opens to let the vapors escape.

If a valve fails, your engine will experience problems. For this reason, a failing valve needs to be replaced or repaired as soon as possible. The challenge is determining the root cause of the failure. Unless the reason is identified and resolved, a replacement IV or EV will meet the same fate (e.g. breakage, premature wearing, etc.). In this article, we'll describe the most common reasons engine valves fail.

Defective Parts

Surprisingly, a large portion of failures are due to defects in the valves. For example, metal impurities may be present, which reduces their durability and causes them to wear more quickly. There may also be blemishes - such as cracks - in the design. These will weaken the metal and make it more susceptible to breaking.

Many IVs and EVs are designed as two-piece components where the stems and heads must be welded together. If the welding is done poorly, they can separate.

Ideally, a mechanic will examine each valve that is being replaced prior to installing it. Defects, such as small cracks, are often easy to see with a quick inspection. By identifying such problems early, you can avoid having to bring your vehicle back when a defective valve fails.

Heat Stress

Between the two valves, EVs are far more vulnerable to heat stress than IVs. The reason is because the vapors creates from the ignition of the air-fuel mixture expand at extremely high temperatures. They rush past the EV continuously. Over time, the intense heat (up to 1,350 degrees Fahrenheit) causes thermal stress in the EV.

This is the reason exhaust valves are often designed with steel as opposed to a weaker material. The steel is more durable against the high temperatures. That said, the heat still takes a toll and can eventually cause failure.

Mechanical Fatigue

Mechanical fatigue can cause the intake and exhaust valves to break. There are two main areas where breakage typically occurs. The first is between the head and the stem (where two-piece valves are welded together). The second is on the end of the stem near the keeper grooves.

Fatigue can occur for a couple of reasons. For example, high temperatures can cause the metal to stretch. This breaks down the material over time and makes it more susceptible to breaking. It can also happen when there is too much clearance between the valve and the camshaft. This can lead to stress as the valve closes with excessive force.

Other Issues

In some cases, the IV or EV can become bent due to the piston slamming against it. This can happen if the valve springs are failing, your engine is operating at extremely high RPMs, or if a lack of oil is causing the valve to stick.

The valves can also fail due to premature wearing in the stems. Factors that can contribute to this problem include a lack of oil and excessively high operating temperatures (for example, when your engine overheats). Bad seals can also lead to wearing because they regulate the amount of oil available to the guides.

Intake and exhaust valve failures are normally expensive to fix. The most effective way to prolong their life is to have engine-related problems resolved before they sustain stress, fatigue, and ultimately, damage.

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Origins of Modern Boxing

Fighting with the fists for sport and spectacle is probably as old as sport itself. Boxing contests are found throughout antiquity. Greek boxers would wear boxing gloves (not padded) and wrappings on their arms below the elbows, but were otherwise naked when competing. There is evidence to suggest that boxing was prevalent in North Africa during 4000 BC. First accepted as an Olympic sport (the ancient Greeks called it Pygmachia) in 688 BC, participants in the ancient games trained on punching bags (called a korykos). Keeping their fingers free, boxers then wore leather straps (called himantes) on their hands, wrists, and sometimes lower arms, to protect them from injury.

The word "boxing" first came into use in England in the 18th century to distinguish between fighting to settle disputes, and fighting under agreed rules for sport. It is now used to describe a sport in which two contestants (boxers) wearing padded gloves face each other in a "ring" and fight an agreed number of "rounds" under recognised rules. Although men have always been the most numerous participants, there are some references to fights between women during the 18th century, and women's boxing was organised again at the end of the 20th century.
Pre-Queensberry Era

During the 18th and early 19th centuries, pugilism (bare-knuckle fighting) was an important precursor of boxing in Britain. Boxing, however, probably grew most specifically out of the demonstrations held at the fives court and the tennis court in London in the early 19th century. These promotions had several features that anticipated the future sport of boxing. The boxers wore "mufflers" (padded gloves), "time" was called after a set period, and the length of the fight was predetermined. Wrestling throws were also barred, as was hitting an opponent on the ground. None of these features were present in bare-knuckle pugilism. The first person to codify such rules was Jack Broughton, a prominent bare-knuckle fighter in the 1730s, when he opened his own amphitheatre in 1743. He devised the rules in order to give his fighters a certain amount of protection (he himself had killed an opponent two years earlier).

For a generation following the creation of the Queensberry Rules, bare-knuckle and glove-fights were both promoted. The bare-knuckle fights were usually held under the "New Rules" produced by the Pugilistic Benevolent Society in 1866, which had superseded the "Pugilistic Association's Revised Rules" of 1853. They were often popularly referred to as the "Rules of the London Prize-Ring".

Queensberry Rules

"Boxing" as distinct from any other form of fist fighting can be dated from 1867, when John Chambers drafted new rules. There were twelve rules in all, and they specified that fights should be "a fair stand-up boxing match" in a 24-foot ring. Rounds were to be of three minutes duration with one minute between rounds. Ten seconds were allowed for a man to get up if he had gone down during a round. New gloves of "fair-size" were to be worn and "wrestling or hugging" was specifically forbidden. These gloves' purpose is to protect the knuckles. An average pair of boxing gloves appears like a bloated pair of mittens, are often red, and are laced up around the wrists. The rules were published under the patronage of the Marquess of Queensberry, whose name has always been associated with them. The first fighter to win a world title under these rules was "Gentleman Jim" Corbett, who defeated John L. Sullivan in 1892 at the Pelican Athletic Club in New Orleans.

The success of boxers has always been associated with their size. In the early years of pugilism, however, there was only one "Champion", who always tended to be one of the heaviest. The term "light weight" was in use from the early 19th century and fights were sometimes arranged between the lighter men, but there was no specific Championship for them.

The terms lightweight, welterweight, middleweight and heavyweight became common during the late 19th century, but there were no universally recognised definitions of weight class. Throughout the 20th century, new weight classes were added, extending the range down to strawweight and up to superheavyweight but with varying agreement over their definitions.

In the early days of pugilism, all fighters were "professional" in the sense that few would fight for "love" rather than money. No distinct "amateur" sport existed until 1867, when amateur championships under Marquess of Queensberry Rules were held at Lillie Bridge in London for Lightweights, Middleweights and Heavyweights. By this date, the old professional bare-knuckle "Prize Ring" was in terminal decline. It had always been against the law, but in the early part of the century it survived because it had widespread popular support and because there were many influential men who supported it. By 1867, however, the results of fights were increasingly suspect, and sometimes boxers even failed to turn up for fights. Less money came into the sport and bare-knuckle pugilism slowly died out.

Conversely, the amateur side of the sport flourished, not only in schools, universities and in the armed forces, but also in the working-class areas of the expanding urban centres.

With the gradual acceptance of Marquess of Queensberry Rules, two distinct branches of boxing emerged, professional and amateur, and each produced its own local, national and international governing bodies and its own variation of the rules.

About the Author

With over 5 years writing experience for both online and offline publications, Edward Smith has recently been concentrating on his latest website at http://www.wirelessmeatthermometer.net offering information and advice about choosing a wireless meat thermometer.

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