General Challenger

Fuel economy for vehicles (city, highway and combined) is measured under controlled conditions in a laboratory using a series of tests specified by federal law.The results are displayed for the consumer on the "new car window sticker." Estimating MPG with Laboratory Tests In the laboratory, the vehicle's drive wheels are placed on a machine called a dynamometer. The "dyno" simulates the driving environment much like an exercise bike simulates cycling. Engineers adjust the amount of energy...

The term hydroplaning is commonly used to refer to the skidding or sliding of a car’s tires across a wet surface. Hydroplaning occurs when a tire encounters more water than it can scatter. Water pressure in the front of the wheel pushes water under the tire, and the tire is then separated from the road surface by a thin film of water and loses traction. The result is loss of steering, braking and power control. Rubber tires have tread (grooves) that are designed to channel water from...

Over the past 97 years, “entertainment systems” in cars have evolved from primitive 6-volt dry-cell AM radios to high-tech Bluetooth units. It is interesting to take a look back to see how technology has changed over the years. Here is a brief, illustrated chronology of these devices: 1922: First radio in a Car The first radio (“Marconiphone”) appeared in a Daimler car at the Olympia Motorshow in England. 1927: First Radio in Mass-Produced Car The “Transitone” radio appeared in a...

Getting lost while driving, or stopping at a gas station to ask for directions, has become a thing of the past. With GPS in your car’s navigation system, in the portable navigation device on your dashboard, or in your smartphone, it is easy to pull up a map and see where you are, or get directions to where you are going. GPS makes you safer, routes you around traffic delays and helps you find nearby services. GPS (Global Positioning System), a technology we now take for granted, started...

A new car dealer has a 2017 Mopar edition that was never sold. Less than 50 miles. Sticker was 63,000 reduced to 50,000. Question I have what is the better choice. A 392 scat pack or the Mopar edition? Seems the Mopar edition is around Hellcat price. I have a 14 Mopar edition, don't see many for sale. Depends on what I can get. Thanks

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The NHRA has a huge variety of categories and eliminators. Class eligibility is based on requirements that include type of vehicle, engine size, vehicle weight, allowable modifications and aerodynamics. Top Fuel, Funny Car, Pro Stock, Top Alcohol Dragster, Top Alcohol Funny Car, Super Comp, Super Gas, Super Street and Pro Mod feature a single class of vehicle in heads-up competition. Comp, Super Stock, and Stock are made up of a variety of classes equalized by a handicap starting system....

Carbon Fiber is a polymer and is sometimes known as graphite fiber. It is a very strong material that is also very lightweight. Although carbon fiber is five times stronger and twice as stiff as steel, it is lighter than steel; making it the ideal manufacturing material for many parts. These are just a few reasons why carbon fiber is favored by engineers and designers for manufacturing. Carbon fiber dates back to 1879, when Thomas Edison baked cotton threads or bamboo silvers at high...

A limited-slip differential (LSD), or “anti-spin” differential is a type of differential that allows the rear wheels on a vehicle to turn at different speeds when executing a turn. They are widely used in high performance and four-wheel-drive vehicles because they provide superior traction abilities. Various types of differentials can be classified as "anti-spin." These include limited slip, locking and spool differentials. Each performs differently on and off the road. Generally, only...

In the early days of the automobile industry, painting was a slow process. It was applied manually and dried for weeks at room temperature by solvent evaporation. 1930 Packard Factory As mass production of cars made the process untenable, paint began to be dried in ovens. Nowadays, two-component (catalyzed) paint is usually applied by robotic arms and cures in just a few hours either at room temperature or in heated booths. (Note- That is why car paint can be waxed as soon as the new owner...

It is important to ensure your vehicle is installed with a properly sized tire. Each tire size is designed to fit a specific rim width. The correct rim width allows the tire sidewall to flex where the designers meant for the flex to occur. There is a wide range of tires that will fit a specific rim width. After you know what size range of tire will fit your wheels, you can pick a size based on aspect ratio and height of the different tire sizes. A rim that is too narrow in relation to the...

An ignition coil (also called a spark coil) is an induction coil in an automobile's ignition system. It transforms the battery's low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel. Early gasoline internal combustion engines used a magneto ignition system, since vehicles did not have batteries. The voltage produced by a magneto was dependent on the speed of the engine, making starting difficult. A battery-operated coil, however,...

Since the beginning of hot rodding, enthusiasts have tinkered with their car’s exhaust system, particularly the mufflers, to get the “right sound.” A muffler’s job sounds easy enough- reduce exhaust volume to tolerable levels while allowing the sweet sounds of your ride to waft through the air. But this becomes a monumental task as horsepower increases. Engines build horsepower by pushing spent exhaust out of the tailpipe as fast as possible. As pistons furiously churn, exhaust velocity...

A component of any car or truck engine is an exhaust manifold for each bank of cylinders .In most production engines, the manifold is a cast iron assembly designed to collect the exhaust gas from two or more cylinders into one pipe. Engineers like cast iron because of its heat management properties and its superior longevity over any other type of exhaust outlet design. They also use the least metal, occupy less space and have the lowest production cost. Although these design restrictions...

Modern automatic transmissions can trace their origins to a gearbox that was developed in 1904 by the Sturtevant brothers. This unit had two forward speeds, the ratio change being brought about by flyweights that were driven by the engine. At higher engine speeds, high gear was engaged. As the vehicle slowed down and engine rpm decreased, the gearbox would shift back to low. One of the key developments in arriving at an automatic transmission was the use of planetary transmission in the...