What liquid is used for burnouts? The Truth About Tire Smoke and More

The image of a car’s tires erupting in a cloud of smoke is iconic in motorsports and car culture. But what exactly is being burned, or rather, what liquid is behind that dramatic display? If you've ever wondered what goes into creating those impressive burnout spectacles, you're in the right place. We're going to break down the science and practice of burnouts, focusing on the primary "liquid" involved and addressing some common misconceptions.

The Simple Answer: Tires and Asphalt

Contrary to what some might believe, there isn't a special "burnout liquid" that's poured into the fuel tank or sprayed onto the tires. The dramatic smoke and rubber residue from a burnout are primarily the result of friction between the vehicle's tires and the road surface. When a driver applies significant power (with the brakes engaged to hold the vehicle in place, or by using a clutch to overwhelm the rear wheels) and simultaneously spins the tires, intense heat is generated.

How the Smoke is Created:

Tire Degradation: The rubber compound of the tire is designed for grip and durability. However, under extreme heat and rotational stress, the rubber begins to break down. Microscopic pieces of the tire surface are essentially scuffed off.
Friction and Heat: The rapid rotation of the tires against the asphalt creates immense friction. This friction generates heat, which further softens and breaks down the tire rubber.
Ignition (Indirect): The heat generated is usually enough to cause the shredded rubber particles and any residual moisture or contaminants on the road surface to vaporize or combust slightly, creating the visible smoke. It's not a true "fire" in most cases, but rather a pyrolytic process where the rubber decomposes.
Asphalt Contribution: The asphalt itself plays a role. The heat can also affect the asphalt binder, causing it to break down and contribute to the fumes and residue.

What About "Burnout Fluids" or Additives?

While the primary "liquid" involved is the tire rubber itself, there are instances where drivers might use certain additives to enhance the burnout effect. These are not poured into the fuel system but are typically applied to the tires or the road surface.

Water: This is one of the most common "enhancements." Spraying water on the tires or the track surface can help cool the brakes and reduce the risk of overheating the drivetrain during prolonged burnouts. It also helps to quickly turn the rubber particles into steam when they reach the critical temperature, contributing to a thicker, more voluminous smoke.
Soaps or Detergents: Some might use mild soaps or detergents, often mixed with water. These can help break down the rubber particles more effectively and create a more consistent smoke. However, this is less common in professional or sanctioned events due to potential track damage or slipperiness.
Specialty Products (Rare and Risky): In very niche, often underground, or experimental situations, people might explore other substances. However, using anything beyond water or mild soap can be extremely dangerous, damage the vehicle, the track, and pose significant fire hazards. It's important to stress that these are generally not recommended and can be illegal.

Misconceptions:

"I heard they put kerosene or something in the tires?"

This is a common myth. While flammable liquids would certainly make for more fire, they are not typically used for standard tire burnouts. Such practices are incredibly dangerous, could lead to explosions, and are definitely not what creates the typical smoke you see.

Why Do Drivers Perform Burnouts?

Burnouts serve several purposes, depending on the context:

Warming Tires: In racing, particularly drag racing, drivers perform a "water box" burnout. This involves driving the rear wheels over a shallow pool of water and then accelerating. The water helps to cool the tires while the spinning heats them up, creating a sticky, high-grip surface for the launch.
Clearing Debris: Burnouts can clear dirt, dust, or other debris from the tire tread, ensuring maximum contact with the track surface.
Showmanship: In car shows, exhibitions, or some motorsports like drifting, burnouts are a popular way to entertain the crowd and demonstrate the car's power and the driver's skill.
Ceremonial: Sometimes, burnouts are performed as a celebration or to mark a special occasion.

The Environmental Impact and Legality

It’s worth noting that burnouts, while visually impressive, are not environmentally friendly. They release particulate matter into the air and leave behind rubber residue and often oil or fuel traces on the road. For these reasons, performing burnouts on public roads is illegal in most places and can result in fines, license suspension, and charges for reckless endangerment or property damage.

Frequently Asked Questions (FAQ)

How much does a burnout damage a tire?

A significant burnout can destroy a tire in a matter of seconds or minutes, depending on the power of the vehicle and the duration of the burnout. The rubber is literally ablated and vaporized, leaving behind a burnt-out shell of the original tire.

Why do burnouts create so much smoke?

The smoke is a combination of vaporized and slightly combusted rubber particles from the tire, along with fumes from the asphalt. The intense heat generated by friction causes the materials to break down into a fine aerosol, which appears as smoke.

Can you do a burnout with just any car?

While you can spin the tires of most cars, a true, sustained burnout that produces a lot of smoke requires a vehicle with sufficient engine power, torque, and a drivetrain capable of handling the stress. Front-wheel-drive cars can sometimes be tricky to burnout due to how the power is applied, but it is possible. Rear-wheel-drive and all-wheel-drive vehicles are generally better suited for producing impressive burnouts.

Are there special tires made for burnouts?

Yes, there are tires designed specifically for burnout competitions or for vehicles that are frequently used for burnouts. These tires are often made with softer rubber compounds that break down quickly and efficiently, producing more smoke and often lasting longer under burnout conditions compared to regular street tires. However, for most performance applications, regular high-performance tires will suffice for occasional burnouts.