Articles from SRT-Tom

  1. Types of Tires

    Tires come in many treads, sizes and performance characteristics. Here is a primer on the basic car tire categories and some popular consumer choices. Extreme Performance Summer Hyper-focused on extreme dry grip, but gives up wet traction, comfort and tread life to get it. Not to be driven in near-freezing temperatures, in snow or on ice, or at high speeds in deep standing water, these specially tuned tires combine big-block tread designs with aggressive tread compounds and reinforced...
  2. Engine Dyno vs. Chassis Dyno

    What's the difference between running an engine on an engine-dyno, or, as installed in the car, on a chassis-dyno? Most chassis dynos extrapolate an engine's power and torque based on vehicle inertia. Many variables can affect chassis dyno results. It's a great convenient tuning aid, but you can't directly equate the reported torque and power numbers back to engine dyno results, or even the results obtained from two different chassis dynos. Operator experience is critical for obtaining...
  3. Hemi Heads

    In recent years, Dodge has produced four different Hemi heads. Here is a brief description of each. In 2003, the 5.7 Hemi received the first, followed in 2005 by the 6.1 hemi design. In 2009 and 2011 respectively, the 5.7 Hemi Eagle and 6.4 Hemi Apache head appeared along with Variable Valve Timing (VVT) and the larger 392-inch engine. As the engines got larger, the heads improved with the help of larger valve sizes and improved ports. As cams got bigger, the beehive springs got more...
  4. 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...
  5. A Look Back- The Rebirth of the Challenger

    The Challenger concept car, shown at the 2006 Detroit International Auto Show, was a big tease for Mopar fans. It was the answer to a hot rodders’ dream- the reincarnation of a 1970s Dodge muscle car! But, would it make it to production? See the 15:11 minute mark of the following video: Based on the success of the retro-inspired 2005 Mustang GT, Dodge looked at its parts bins and figured out how to use this stuff to create a modern-day Challenger. To accomplish this feat, Chrysler drew...
  6. What is Octane?

    When you pull into a gas station, you usually presented with four options: regular, plus, premium and ultra premium. But, have you ever wondered what those numbers- 87, 89, 91 and 93 mean? Octane is the measure of how much compression a fuel can withstand before igniting. The higher the octane rating, the less likely the fuel is going to pre-ignite (i.e., explode unexpectedly) at higher pressures and damage your engine. That’s why performance cars with higher compression engines require...
  7. Driving Dangerously in Motown- 1900-1930

    The very first gasoline-powered vehicle driven on the streets of Detroit was built by engineer Charles Brady King in 1896. It went as fast as 20 mph, which was described in the newspaper as "tearing along the street at a lively rate, dodging people and teams." The transition from the horse age to the motorized age would prove to be very dangerous. At first speeding vehicles were not a big problem, with only a few of them on Detroit streets, but the situation grew serious quickly. As early...
  8. Featured

    Challenger ACR Rumor

    An exciting rumor is that there may be a hardcore Challenger ACR, in 2021, to replace the discontinued American Club Racer Viper. Even though the Challenger ACR has already been presented, in 2011, at the SEMA Show with SRT8 goodies as a one-off concept, Dodge has failed to come up with a production model. Insider “Muther” told Allpar.com that we should look forward to two variants, one with the Hellcat Redeye engine and the other with the 392 HEMI. He stated, “The supercharger is not...
  9. Featured

    Modern Hemi Engines

    Modern Hemi production began in June 2002 at the Saltillo plant in Mexico. The first-generation 5.7 liter produced up to 350 horsepower at 5,600 rpm and 375 lb-ft of torque (4,400 rpm)- one horsepower per cubic inch- just like the legendary 426 Hemi. It was smaller, more powerful, and cheaper to build than theLA-series 360 V8 and the "Next Generation" 4.7 liter V8 it replaced, but produced more power and torque. It hooked up to the Mercedes 5-speed automatic, Chrysler's 5 and 6-speed truck...
  10. Featured

    Prevent Tire Flat-Spotting

    It’s not uncommon for some of us to leave our cars parked for long stretches of time- sometimes spanning days, weeks or even months. If you’re one of these car owners, you may notice a slight ride disturbance or vibration the first time you drive your car, but it will usually disappear after a few miles of driving. This phenomenon is known as flat-spotting. Flat-spotting occurs when the weight of a car presses down on the same section of an immobile tire for long enough, and under the right...
  11. Dick Landy- Mopar Drag Racing Pioneer

    Dick Landy, a legendary drag racer and a major pioneer in Super Stock, Funny Car and Pro Stock, was also known for his innovative race cars and wild wheel stands. His nickname "Dandy Dick" came from his neat appearance in pressed white pants and jacket and long unlit cigar clenched between his teeth. Landy was among the drivers who popularized late-model Super Stock cars in the 1960s, campaigned the first Funny Cars in the middle of that decade and helped establish the popularity of Pro...
  12. Featured

    100th Article! Dodge Brothers

    Few people are aware of the important role that John and Horace Dodge played in shaping Detroit’s early auto industry, and of the story of a dynamic partnership formed between two enterprising brothers who remained inseparable throughout their lives. John (right) and Horace Dodge HUMBLE BEGINNINGS Born into an industrious but poor family, Dodge brothers, John (born in 1864) and Horace (born in 1868), received their mechanical training from working in their father’s machine shop, in Niles,...
  13. Safety Regulations/Equipment for Racing

    If you plan to enter your vehicle in any competition sanctioned by the NHRA, your Challenger is going to have to pass a series of pre-race inspections for the required safety equipment. These requirements get more stringent as the expected horsepower and speeds increase.The SFI Foundation sets the standard for quality assurance in the vast majority of aftermarket and performance products. Basic Safety The basic safety stuff for the street legal classes is pretty simple. You’ve got to have...
  14. 4th Generation Drag Pak

    On November 5, 2019, during the annual SEMA Show in Las Vegas, Mopar and Dodge/SRT took the wraps off their latest offering, a new, fourth-generation version of the factory-built, racetrack-only, Dodge Challenger known as the Drag Pak. The 2020 Drag Pak will be limited to a production run of just 50 serialized units. It is engineered for grassroots drag racers that compete in sportsman classes in events sanctioned by NHRA and NMCA. Its complete turnkey package and modular kits, make it...
  15. Shock Absorbers

    An automobile shock absorber is basically a hydraulic piston that absorbs and dissipates vibration using spring-loaded check valves and orifices to control the flow of oil. The first production hydraulic dampers, to act on the main leaf spring movement, were probably those based on an original 1908 concept by Maurice Houdaille. One design consideration, when designing or choosing a shock absorber, is where that energy will go. In most shock absorbers, energy is converted to heat inside the...
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