Pro Stock is a drag racing class featuring "hot rod factory". Classes are often described as "all motor", because cars do not use any form of forced induction such as turbocharging or supercharging, or other enhancements, such as nitrous oxide, along with regulations governing permissible modifications to machines and body types used.
Video Pro Stock
Histori
The National Hot Rod Association's Stok class appeared from a production-based Super Stock in 1970 with a more liberal set of rules and no defects. The initial rule favored the large block V8s but in 1972 (after Sox & Martin hemi-powered cars seized the first two Pro Stock titles easily) has been changed to support small-bloc for Chrysler Hemi's exit factor. In 1982, NHRA implemented a new engine formula that allowed the big-block to return, due to the popularity of the IHRA Pro Stock Motorcycle car, which had unlimited displacement; NHRA limits the engine to a maximum of 500 Â ° c (8,200 cc).
Maps Pro Stock
Pro shares today
Engine
- The machine must be made by the same company as the car body with all the raw components available to anyone for public purchases. Engine blocks and cylinder heads are often provided in "raw" conditions with only approximate rough dimensions and machining. Each team will continue to process and modify the section according to their own standards.
- NHRA Pro Stock engine is limited to a maximum of 500 Â ° c in (8.2Ã,L) single-camshaft, 90-degree V8.
- Some non-NHRA agencies have different rules. The PDRA (eight-mile) and IHRA (race sanctions in North America) for example have no 500-cubic inch rules, with multiple machines exceeding 800 cuÃ, at (13.1 L), up to more than 1,000 cuÃ, at (16.4 Ã, L), known as "mountain motor."
- The Australian National Racing Drag Association and IHRA-supported races in Australia have a maximum engine capacity limit (6.6Ã,L) of 400 m.
- Depending on the sanctions of the body and class, the engine may be a four-barrel carburetor or electronic fuel injection throttle body and should be a naturally aspirated intake system.
- Those who use two four-barrel carburetors can allow them to "split" (ie sawed in half) so that each piece can be more accurately positioned over the intake runner slightly staggered. Intake manifold and head open for modification. The most effective intake manifold configuration continues to be a "ram tunnel" for nearly 40 years. The carburetor is raised above the engine; length and intake channel configuration ("runners") are essential for horse power output. The high intake manifold requires a large hood spoon which is the signature of the Pro Stock class. (Scoop hood is illegal in NHRA due to EFI)
- NHRA (starting 2016) requires, and permits PDRA Extreme Pro Stock, a car to use electronically controlled throttle body fuel injection systems.
- In NHRA, the electronic control unit (ECU) will be applied to the EFI system, including the 10,500 RPM limit, with modern engines approaching 12,000 RPM.
Rules that exclude forced inductions of any kind, plus allow head modifications, have produced Pro Stock heads to be the most sophisticated in the drag racing category, with valve elevators in region 1 ".
Modern Pro Stock engines generally produce about 2.5 hp/inch (114 kW/L), and make more than 1,500 hp while being naturally aspirated.
A complete NHRA Stock Pro machine can cost over $ 100,000.
Drivetrain
- Stock Clutch Pro uses multiple discs. It must be serviced after each run to maintain a critical tolerance which can mean the difference between a good shock or a severe shock.
- Since 1973, the most popular transmission is the Lenco planet design, first used as four speeds and now as five speeds. Although the five-speed unit (usually air-switched) is still used in the ADRL and the Association of Motor Mountain Pro Shares and in the three-speed Air-Shift unit in Pro Modified, NHRA Pro Stocks uses Liberty or G-Force five-speed without clutch. manual transmission.
Body
- The NHRA Pro Stock racer uses an NHRA approved carbon fiber body. Windows is made from polycarbonate.
- Some complain that the "Stock" share of "Pro Stock" is not really accurate anymore, since very few, if any, of racing car bodies have their origins in their respective manufacturers' factories.
Chassis
- Casing Pro Stock welded 4130 chrome-molybdenum alloy steel pipe, with a "funny-car style" enclosure integrated around drivers who, combined with safety and helmet restrictions result in a very rigid and safe driving environment brought in after crash rollover suffered by Bob Glidden in 1986 Southern Nationals.
Suspension
- Pro Stock cars are required to use automotive type suspension systems.
- Since the 1970s, the front suspension has used MacPherson struts with a control group; for rear suspension, the preferred design is a four-link suspension with a coil over shock absorber connected to a fixed rear axle.
- Front and rear shock absorbers can be adjusted automatically during run by air circuits controlled by electronic control units.
Brake
- The main way to slow the car from their top speed of around 213 mph is the dual drag launch.
- Launch using a compressed air spring or launcher to pull the parachute into the air as quickly as possible and to avoid dead air behind the car.
- Four-wheel disc brakes made by an aftermarket manufacturer are also used.
- Brakes have a single caliper in the front and a double caliper on the back with a carbon fiber rotor.
Fuel
- The factory heat rod may only use racing fuel (octane rating: 118), which is tested and certified by chemical analysis at the event with the approval of the sanctions body.
- Some organizations will mandate fuel specifications. NHRA will mandate the Sunoco racing fuel specification, but it is unknown whether the fuel specifications will be unleaded racing fuel as in other motorsport classes where they are the official fuel, or allow alcohol in NHRA official fuel (as it has been in INDYCAR , 85% ethanol, or NASCAR, 15% ethanol).
- The Stock Pro fuel system pumps gas at 7.5 gallons per minute (0.5 L/sec).
In addition to all these specifications, each car must:
- Weighs a minimum of 2,350 pounds (1,066 kg), including drivers.
- In the NHRA competition, cars must be produced in the last five year models (2011-2015). In the late 1980s and into the 1990s, car size increased when mid-sized family sedans had become the car of choice, but cars shrunk in the 2000s as a compact car, separating the popularity of the compact sport class, into Trends, such as General Motors and Daimler (then own the Dodge brand) started using compact cars (similar to the RWD Pro except for the engines). However, that encouragement back to the pony and mid-size family sedan cars became an option again, as Ford used the "horse car" and Dodge and Chevrolet started using midsize family sedans. 2013 legal cars are Chevrolet Camaro, Dodge Avenger, and Ford Mustang. For 2014, the Fiat team made the transition to Dodge Dart.
- The rear spoiler should be no more than 13 inches (330 mm), measured from the body-line-to-spoiler transition point to the end.
- Complete headlamps, parking lights, and taillights should be kept in the original factory location.
This makes some races very tight; front runners in the classroom can reach speeds of over 213 miles per hour (343 km/h) in 6.47 seconds (roughly). The qualifying round is separated by less than a tenth of a second in all competitors. In a very tight list of qualifications, the difference from # 1 to final # 16 qualifying may be.05 seconds.
The MMPSA car, due to their massive 800 cubic-mile mountain motor, goes to 6.30 at nearly 220 miles per hour (354 km/h). Recently, some cars have entered 6.20, with Brian Gahm being the first with 6.29 seconds at the Grand Bend Motorplex.
NHRA Pro Stock Champions (1974-present)
- 1974 - Bob Glidden
- 1975 - Bob Glidden
- 1976 - Larry Lombardo
- 1977 - Don Nicholson
- 1978 - Bob Glidden
- 1979 - Bob Glidden
- 1980 - Bob Glidden
- 1981 - Lee Shepherd
- 1982 - Lee Shepherd
- 1983 - Lee Shepherd
- 1984 - Lee Shepherd
- 1985 - Bob Glidden
- 1986 - Bob Glidden
- 1987 - Bob Glidden
- 1988 - Bob Glidden
- 1989 - Bob Glidden
- 1990 - Darrell Alderman
- 1991 - Darrell Alderman
- 1992 - Warren Johnson
- 1993 - Warren Johnson
- 1994 - Darrell Alderman
- 1995 - Warren Johnson
- 1996 - Jim Yates
- 1997 - Jim Yates
- 1998 - Warren Johnson
- 1999 - Warren Johnson
- 2000 - Jeg Coughlin
- 2001 - Warren Johnson
- 2002 - Jeg Coughlin
- 2003 - Greg Anderson
- 2004 - Greg Anderson
- 2005 - Greg Anderson
- 2006 - Jason's Path
- 2007 - Jeg Coughlin
- 2008 - Jeg Coughlin
- 2009 - Mike Edwards
- 2010 - Greg Anderson
- 2011 - Jason's Path
- 2012 - Allen Johnson
- 2013 - Jeg Coughlin
- 2014 - Erica Enders-Stevens
- 2015 - Erica Enders-Stevens
- 2016 - Jason's Path
- 2017 - James E. "Bo" Butner III
The most successful racer in Pro Stock is 10-time champion Bob Glidden. The rider with the most wins in a single season is a three-time champion Darrell Alderman, who won all but three matches on his way to his 1991 championship.
Most of the NHRA Pro Shares win
See also
- Pro Stock Bike
External links
- Anatomy of Stock Pro
- NHRA home page
References
Source of the article : Wikipedia
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