1 2005 Car Funny Reunion

File:DonPrudhomme1989FunnyCar.jpg

Funny Car is a drag racing car class. In the United States, other "professional" classes are Top Fuel, Pro Stock, and Pro Stock Motorcycle. Funny cars have forward-mounted engines and carbon fiber automotive bodies over the chassis, giving them an appearance vaguely approximating manufacturers' showroom models. The Dodge Charger and Chevrolet Impala sedans, along with the Ford Mustang and Toyota Solara coupe, are now commonly used in the National Hot Rod Association (NHRA). Worldwide, however, many different body styles are used. These "fake" body shells are not just cosmetic: they serve an important aerodynamic purpose.

Guidelines

The NHRA has strict guidelines for funny cars. Most of the rules relate to the engine. In short, the engines can only be V-8s displacing no more than 500 cubic inches. (The most popular design is loosely based on the Chrysler 426 Hemi.) There can only be two valves per cylinder. The heads are machined from a solid block of billet aluminum and have no water jackets, as the high latent heat of the methanol in the fuel coupled with the brevity of the run precludes the need for water cooling of the cylinder heads. Superchargers are restricted to a basic Roots type—19-inch (480 mm) rotor case width with a breadth of 11.25 inches (286 mm). The rotors are not allowed to have more than a certain amount of helical twist in them so the blower does not become a screw-type supercharger in function. Only single camshafts are allowed. There are two common bore-stroke combinations: 4.1875 by 4.50 inches (106.36 mm × 114.30 mm) (called a 3/4 stroker ) and 4.25 by 4.375 inches (108 mm × 111 mm) (called a 5/8 stroker ). The 3/4 stroker is the most common combination used today and equals 496 CID (8.1 L).

Engine blocks are usually made out of billet. Crankshafts are CNC machine carved from a single piece of steel billet then nitrided in an oven to increase surface hardness. Intake valves are titanium and of 2.40-inch (61 mm) width, while exhaust valves are 1.90-inch (48 mm) width of Inconel. Every funny car has ballistic blankets covering specific parts of the engine prone to explosion, namely the supercharger

Funny car fuel systems are key to their immense power. During a single run (starting, burnout, backing up, staging, 1/4 mile) cars can burn as much as 15 US gallons (12 imp gal; 57 L) of fuel. The fuel mixture is usually 85–90% nitromethane with 10–15% methanol. The ratio of fuel to air can be as high as 1:1. Compression ratios vary from 6:1 to 7:1. The engines in funny cars commonly exhibit varying piston heights and ratios that are determined by the piston's proximity to the air intake. Funny cars have a fixed gear ratio of 3.20:1 and have a reversing gear; power is transmitted from engine to final drive through a multiple staged clutch which provides progressive incremental lockup as the run proceeds. The rate/degree of lockup is mechanically/pneumatically controlled and preset before each run according to various conditions, in particular track surface. Wheelbase is between 100 and 125 inches (2.5 and 3.2 m). The car must maintain a 3-inch (76 mm) ground clearance.

Horsepower claims vary widely—from 6,978 to 8,897—but are probably in the 8,000 BHP range. Supercharged, nitromethane-fueled motors of this type derive their extremely high speeds from their torque, which is estimated at about 7,000 ft·lbf (9,500 N·m). They routinely achieve a 6G acceleration from a standing start.

Safety

Many safety rules are in place to protect the driver and fans. The more visible accoutrements are the twin parachutes to help stabilize and decelerate the car after crossing the finish line.

During safety evaluations in the wake of the fatal crash of Scott Kalitta on June 21, 2008 in Englishtown, N.J., the NHRA has temporally reduced the distance of Top Fuel and Funny Car races to 1,000 feet effective July 2, 2008. Pro Stock and sportsman classes still race to 1,320 feet.

Origins and name

The first funny cars were built in the mid-'60s and so-called because the rear wheels had been moved forward on the chassis to improve weight transfer under acceleration, increasing traction on the rear tires, which were oversized compared to stock. Looking at the cars, they didn't quite look stock, hence the name "funny." Many of the older cars are still raced today in the NHRA Heritage Hot Rod Racing Series, including the National Hot Rod Reunion and the California Hot Rod Reunion.

NHRA Funny Car Champions (1974-2009)

1974 - Shirl Greer, 1975 - Don Prudhomme, 1976 - Don Prudhomme, 1977 - Don Prudhomme, 1978 - Don Prudhomme, 1979 - Raymond Beadle, 1980 - Raymond Beadle, 1981 - Raymond Beadle, 1982 - Frank Hawley, 1983 - Frank Hawley, 1984 - Mark Oswald, 1985 - Kenny Bernstien, 1986 - Kenny Bernstien, 1987 - Kenny Bernstien, 1988 - Kenny Bernstien, 1989 - Bruce Larson, 1990 - John Force, 1991 - John Force, 1992 - Cruz Pedregon, 1993 - John Force, 1994 - John Force, 1995 - John Force, 1996 - John Force, 1997 - John Force, 1998 - John Force, 1999 - John Force, 2000 - John Force, 2001 - John Force, 2002 - John Force, 2003 - Tony Pedregon, 2004 - John Force, 2005 - Gary Scelzi, 2006 - John Force, 2007 - Tony Pedregon, 2008 - Cruz Pedregon, 2009 - Robert Hight

References

  1. ^ The Serious Business of Funny Car Aerodynamics, General Motors

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