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Orifice tubes are used in systems that don't use expansion valves. Like an expansion valve, the orifice tube is used to meter or control the amount of refrigerant entering the evaporator. The diameter of the orifice tube is similarly small to that of the passage inside the expansion valve, but there is one big difference between orifice tubes and expansion valves. An orifice tube is a simple fixed device with no moving parts. It cannot vary the amount of refrigerant flowing into the evaporator the way an expansion valve can. So in systems that use orifice tubes, some additional method of refrigerant flow control must be employed. Two of the most popular methods used to do this are turning the compressor on and off at appropriate times, or cycling it, or installing a valve inside the compressor that can actually cause an adjustment to the pumping capacity of the compressor. This, of course, regulates the amount of refrigerant leaving the compressor. In the systems that use them, the orifice tube servers as a dividing line between the high and low pressure sections of the sytem.
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Consumers Beware Gas-saving Devices
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ExxonMobil Follows AMSOIL into Extended Drain Market
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Mon, 27 Mar 2006 13:03:00 PST
Increasingly high fuel prices mean an increase in the number of products that promise to add fuel savings and cut costs at the pumps.
Mon, 08 May 2006 19:00:00 PST
AMSOIL Introduces New Ea Air Induction Filters
AMSOIL unveiled May 1, 2005 its new line of universal air induction filters, designed to replace stock oil wetted gauze or foam conical filters typically supplied by K&N, Injen, Green, AIRAID, AFE, TrueFlow and more.
Mon, 08 May 2006 15:54:00 PST
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The recent introduction of Screamin' Eagle® Synthetic Lubricant by Harley-Davidson® indicates the Motor Company has finally recognized the benefits of running synthetic motorcycle oil in their air-cooled engines. After years of advising dealers and customers to avoid using synthetic oils in their bikes, it's natural to wonder why the company is suddenly marketing one.
Tue, 25 Apr 2006 21:04:00 PST
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I was looking through the 36 page car section of a Popular Mechanics when the following article by Roger Huntington caught my eye: "How Far Can We Go With The Piston Engine?" The article begins like this. "An early death for the age-old internal combustion piston engine is the prediction of some people. They say the exhaust can't be cleaned up enough to meet future air-pollution and antismog laws and that we'll be running around with batteries, steam, fuel cells and atomic engines in another ten years."
Tue, 04 Apr 2006 23:59:00 PST
Integrity and Ethics
It started like this. A friend of mine, after checking out my wife's car, said it needed grease. It was loose underneath, he said. There was a new quick lube that opened up near the mall, so I decided to give them a try. I brought the car to the quick lube, told them twice that it was very important that they grease the car and went off to the nearest bookstore on foot.
Tue, 04 Apr 2006 23:51:00 PST
Catching Up With Tommy Hahn
In his second year of Supercross, Tommy Hahn is hoping to put to good use what he learned last year. And from the looks of how fast he was going in his video last week, we think he has a pretty good chance.
Tue, 04 Apr 2006 23:35:00 PST
Mike LaRocco: Exit Interview
Mike LaRocco has had a career that many racers aspire to have. He has won championships, been to the Motocross des Nations, won numerous races and has taken his career into his 30s. Unfortunately, though, it all had to end sometime, and a few weeks ago in front of a packed stadium in Indianapolis he announced his retirement.
Thu, 30 Mar 2006 23:19:00 PST
Five Reasons People Pay a Premium for a Quart of Oil
Peace of Mind – All-season AMSOIL synthetic motor oils help cars start and run dependably in the temperature extremes of northern winters and deep-south summers.
Long-term, AMSOIL synthetic motor oil’s superior cold-temperature fluidity,
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Conventional vs. Synthetic Lubricants
Conventional lubricants are refined from crude oil. Refining is a process of physically separating light from heavy oil fractions. Crude oil is a natural substance. It contains millions of different kinds of molecules. Many are similar in weight but dissimilar in structure.
Tue, 28 Mar 2006 10:16:00 PST
ExxonMobil Follows AMSOIL into Extended Drain Market
Motor oil technology has gradually progressed since the days of the earliest automobiles. In those days, standard motor oil drain intervals were between 500 and 1000 miles, and motorists had to switch viscosity grades with the changing of the seasons. The development of oil filtration and additive technology in the 1930s allowed drain intervals to increase to 2000 and later 3000 miles, while the development of viscosity modifiers in the 1940s allowed the formulation of multi-grade oils that could be used in both hot and cold temperatures.
Mon, 27 Mar 2006 13:03:00 PST
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