General Challenger

  • Understanding Wheel Offset

    The offset of a wheel is the distance from its hub mounting surface to the center line of the wheel. The whole point of an offset is for the end user of the wheel to know how much in inches (4+3), or in the case of millimeter offset, how many mm the wheel will stick out or tuck in from the mounting surface of the hub. Remember, even a couple of millimeters can affect performance, ride quality, the look/stance of your vehicle and safety. It takes precise measurement to make sure aftermarket...
  • What is Hydroplaning?

    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...
  • Mufflers

    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...
  • Evolution of Rear Spoilers

    A car spoiler is a stylish automobile accessory that can be mounted on the rear of most cars. There are many different styles of spoilers. The general shape consists of a slender slightly downward angled piece of metal, fiberglass, silicone or carbon fiber that is usually the width of the vehicle. Some seem to appear to mold into the vehicle and others stick out with two small ledges on both sides. The term "spoiler" is often mistakenly used interchangeably with "wing." An automotive wing...
  • Chrysler’s Amazing Turbine Car

    Chrysler has always been an innovator in the car industry. Nothing, however, captured the imagination of the driving public and the spirit of the 1960’s space-age as the turbine car. The Chrysler turbine car was produced by Chrysler, from 1963 to 1964. Its body was made by the Italian design studio Ghia, and Chrysler completed its assembly in Detroit. Surprisingly, the Chrysler turbine engine program, that produced the turbine car, began during the late 1930s and created multiple...
  1. Entertainment Systems- from AM Radio to Bluetooth

    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...
  2. How Do Navigation Systems Work?

    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...
  3. Need advice

    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
  4. Drag Racing Classes

    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....
  5. History and Applications of Carbon Fiber

    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...
  6. Limited Slip Differentials

    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...
  7. All About Paint

    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...
  8. The Right Size Wheel for Your Tire

    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...
  9. Ignition Coils

    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,...
  10. Mufflers

    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...
  11. Exhaust Headers

    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...
  12. Mopar Automatic Transmissions

    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...
  13. "Grandfather" of the 2018 Dodge Demon

    Did you know that the controversial Dodge Demon name goes back 48 years? In 1970, the restyled Plymouth Valiant, named the Duster, was a massive success. Dodge immediately insisted on getting its own version. That car became the 1971 Dodge Demon. 1970 Plymouth Duster 340 Both the A-body Plymouth Duster and Dodge Demon were fantastic cars for the money (starting just over $2,100). The two cars were virtually identical, underneath. The attractive-looking Demon came with four optional...
  14. Drag Racing Primer- Tips with Street Tires

    Here are some drag racing tips to make your trip to the drag strip safe and successful. Before you arrive at track Remove the floor mats, child seats (if applicable) and other non-essential cargo. Every bit of weight you remove can help. Try to plan so you have about ¼ tank of fuel when you arrive. Extra fuel adds weight and you won’t need more than ¼ tank. Don’t show up with your tank on empty. The fuel is usually expensive at the track and you don’t want to be “running on fumes.”...
  15. Development & Evolution of the Hemi Engine

    Alan R. Welch and his brothers, owners of the Welch Motor Car Company, are credited for pioneering the first hemispherical engine. The power plant was a simple 20-horsepower, 2-cylinder engine with a single overhead camshaft. Although the General Motors discontinued the HEMI in 1910 when it bought Welch, Peugeot developed its own hemispherical engine. BMW mass-produced a HEMI version before Chrysler engineered it for modern use. Three generations of Hemi engines have been built by Chrysler...
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