The Frontstretch: Looking Back On Restrictor Plates and Other Things to Make Talladega Racing Safe by Amy Henderson -- Monday April 24, 2006

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With all the talk about "The Big One" at Talladega, and all the renewed attention that it has focused on restrictor plate racing, I decided to take a closer look at restrictor plates and other safety rules NASCAR has mandated over the years, what prompted them, and what the ultimate outcome has been.

The carburetor restrictor plate is a thin, square metal device with four holes in it, and when placed over the intake manifold of a racecar, it restricts airflow to the engine. Think running laps around your local high school track while breathing through a straw, and you have the idea. Simply put, less air means less speed. These plates were first introduced in 1987 after a couple of things happened on the track to get NASCAR increasingly concerned about safety. One, Bill Elliott put out a lap of 212.809 miles an hour on a qualifying run at Talladega, a NASCAR speed record. Two, Bobby Allison was involved in a crash, also at Talladega, in which his car got airborne and ripped into the catchfence; several pieces of the car then flew into the stands, injuring fans. NASCAR quickly realized that something had to be done about the speeds at Daytona and Talladega, and so was born the restrictor plate, to the eternal dismay of many drivers. Restrictor plates reduce the speed of a racecar to roughly 190 miles per hour, as opposed to the likely 220 miles an hour or more they would run at those tracks without them.

Restrictor plates also sap the car of its throttle response, which causes cars to lose a tremendous amount of speed if the driver lifts of the throttle for a fraction of a second. It takes a relatively long time for the car to get back to full speed after even that slight lift. Coupled with the aerodynamics of racecars, which has changed significantly since plates were introduced, this causes cars to run in large, tight packs. Closing rates are incredibly fast, but often a driver can’t lift because he’d be run over from behind, and either a thrilling pass or a terrifying crash ensues. Many fans love this kind of racing; it produces a lot of passing and a lot of wreckage. Has the plate truly made racing safer? My vote is yes-and no. Slowing the cars down is good; taking away throttle response is dangerous. Still, we don’t know how superspeedway racing would have evolved without them.

While the jury is still out on restrictor plates, there have been several other safety developments in recent years that have been relatively successful. It used to be that when a racecar turned sideways or backward on a big, fast racetrack, the air underneath would hurl the car into the air, causing a scary flight for the driver inside coupled with the possibility of a car launching over the catchfence into a crowd of fans. Somewhere around 1992, Rusty Wallace amassed a lot of frequent flyer miles, getting airborne and barrel rolling through the tri-ovals at both Daytona and Talladega. In each instance, pieces flew off the car in all directions as it turned over and over. NASCAR had had enough of this for one season, and by the mid-1990s, roof flaps were mandated. These deploy when a car turns sideways, changing the airflow over the roof and usually keeping the car on the ground. It’s not foolproof (just ask Elliott Sadler about his Talladega tangos) but fewer fines for flying without a license have been reported.

More recently, NASCAR was forced to look at a couple of issues after four drivers died of essentially the same injuries in four different crashes. Basilar skull fractures occur when the body, moving at a high rate of speed, is suddenly stopped. The deaths of Adam Petty, Kenny Irwin, Tony Roper, and Dale Earnhardt form this type of injury prompted the sanctioning body to mandate devices such as the HANS device which protect the head and neck from this type of injury for all drivers. Unfortunately, the rule came too late to prevent the tragedies, but it was their unfortunate legacy. Some drivers were reluctant at first, but they eventually got more comfortable. Tony Stewart, the last holdout, eventually got so comfortable in his that he wore it to the 2001 awards banquet along with his tuxedo.

The accidents also prompted NASCAR to speed up development of a softer barrier, one that would absorb at least some of a car’s impact, thereby keeping the driver from absorbing all of it. Every oval track that hosts a Nextel Cup race now has SAFER barriers installed. Ricky Craven once said that drivers and fans would one day look back in amazement on the days when drivers actually ran into concrete walls. Those days are now here.

The impact of these last two safety innovations have yet to be fully measured. No touring series NASCAR driver has been lost while wearing a head and neck restraint, nor as the result of a crash into a SAFER barrier. Luckily, safety continues to evolve in racing. Pit crew members wear helmets. Stronger, taller fences shield fans.

Perhaps the most telling statement on the safety in NASCAR comes from a study that showed that if all of the safety features mandated on NASCAR racecars could be economically integrated into passenger cars, it is estimated that somewhere in the neighborhood of 98% of highway deaths could be avoided. These safety measures can never be completely failsafe in racing, as we have been reminded all too often. Still, while tragedy always lurks nearby in this high-speed world, it has often been held at bay by these and countless other safety devices and regulations. And that, I am glad to say, is history.

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Pete DiVergilio
04/25/2006 09:39 AM

Maybe MASCAR should do more research to see if the cars can be allowed to go 225mph with all the safety features they have now and eliminate restrictor plates completely!


Contact Amy Henderson

Recent articles from Amy Henderson:

Earnhardt Ganassi Racing Announces Partnership with Cessna, Textron
Fans To Decide Format of Sprint Unlimited at Daytona
UNOH and Kentucky Speedway Extend Sponsorship Agreement
Earnhardt Out For Charlotte and Kansas After Talldega Concussion
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Want to know more about Amy or see an archive of all of her articles? Check out her bio page for more information.