Hood Vents: Performance Difference & What’s The Purpose?

Hood vents help an internal combustion engine to breathe, it is designed to extract air from the engine bay. Its openings are towards the back of the car. It’s different from a hood scoop, which is designed to draw air into the engine bay.

If you’re deciding to shift away from airbox intakes, a hood vent is reasonable alteration to consider.

What is the purpose of a vented hood?

The main purpose of a vented hood is to pull air out of your engine bay, you’re removing heated air, making your car’s radiators and intercoolers work more efficiently.

But why do we look to pull air from the engine bay? Wouldn’t we rather expel cold air into this area to keep it cool?

The temperature inside the engine bay can increase quickly, especially when it’s working hard. When there’s no place for the hot air to go, overheating can cause bigger problems. 

If there’s access to the hood, the intercooler works properly to adequately cool down the engine bay. The flow of cold air encourages a low-temperature environment 

This means that the radiators and intercoolers can run more efficiently, allowing your car to perform to the best of its ability.

infrared thermometer

I have got this Infrared Thermometer from Amazon. It does great job on checking engine bay temperature. It comes with a laser pointer, I sometimes use it to play with my car enthusiast cat.

Do hood vents help performance?

Most hood vent features contribute in some way to the improvement of performance. However it is a bit more complicated to put up hood vents on vehicles than to merely slap on a vent and hopefully see an improvement.

Properly expelling air from under the hood is critical to preserving reliable system performance. If you’re still deciding on the best place for your car’s aftermarket vents, look online for reputable vendors with good reviews. Their products have been proven to work, or you might purchase a new product if you’re not comfortable tackling the build from scratch.

Internal combustion vehicles are cooled using outside air that is picked up through the hood vent. It provides improved vehicle power and improved overall performance. 

Dry and cool air generally performs better as opposed to warmer and thinner air. Installing vents with hood vents to supply cool air to the engine allows a car’s performance to improve by at least 5%!

Do hood vents create downforce?

Hood vents can create downforce at the front end of the car with the correct location of hood vents placed. High pressure inside the engine bay is drawn out, forming a downforce which helps the car stay more planted to the ground.

Hood vents are often used in racing cars to help improve aerodynamic performance by creating downforce, which can help increase traction and improve handling. 

Hood vents work by allowing air to flow through them and over the car’s body, which creates a low pressure area on the top of the car. This low pressure area helps to suck the car down onto the track, providing additional grip and stability.

Do hood vents reduce drag?

Vents work as a vacuum to suck the air out of the engine bay in order to decrease the drag of the vehicle. Where these vents are positioned and their physical configurations are crucial.

Vented hoods help to maintain airflow through the engine bay, which improves vehicle cooling. They provide an air exit so that the radiator is able to draw outside air. 

To be effective, the scoop must be in a high-pressure area on the hood. Ideally the vents would be reversed scoop with a section descending into the engine bay between the engine and radiator. 

hood vents on car bonnet

Does a hood scoop increase drag?

Hood scoop is designed to pull air into the engine bay, creating more drag. Depending on its size, if placed strategically, a hood scoop can actually help to reduce drag.

A hood scoop is an additional feature on a vehicle that can serve both aesthetic and functional purposes. While some may believe that a hood scoop automatically increases drag due to its protrusion from the surface of the car, this is not always the case. The amount of drag caused by a hood scoop depends on its size, shape, and location on the vehicle.

The hood scoops’ entrances allow moisture, debris, and mud to accumulate. This could lead to vehicle maintenance having to be performed more frequently, especially when changes are made often to the air filter. Also, it can impact car’s emissions as well as fuel efficiency.

What Are the Disadvantages of Hood Vents?

Weather is likely to create some acidic compounds in the air supply getting into the engine bay. Although motor hood vents feature factory-applied filtration technology to keep rain and dirt and dust out of the engine compartment, this design is not completely effective.

In light rain, so long as it evaporates before it is able to reach the engine bay, is not as much of a cause for concern. Some manufacturers also have set up “umbrellas” to let in the air without the moisture reaching it to prevent this disadvantage.

Sometimes you will find brake dust getting inside the engine bay. It’s really vital to spend additional time undertaking cleanup duties to guarantee that things work as intended.

How Do I Install Hood Vents?

The modification  might not work if the engine in your car is placed in an unusual location.

Not every car on the market can be customised with the after-market addition of hood vents. This may make it tough to finish the work on some vehicles.

That is why it pays to review all potential specifications before starting this project. Unless significant changes are made to the vehicle’s structure, some components may not function properly.

Each car and model is different, which means you have to think about placement and how it looks for your overall needs. It isn’t helpful to throw hood vents into any single location. 

Final Thoughts

Hood vents pull air from your engine bay to make your engines’ heat exchangers run more efficiently. This will make your engines run cooler, which means you can produce more energy. 

Which muffler is your car right now?

Make sure to schedule more cleanup routines in the engine bay! 

Chai WJ.

Chai WJ.

I am a car enthusiast and a passionate rider who loves to discover new places. Since the pandemic, I can't go to places and I started to blog and share information that I learned. I'm not easily distracted, I just... OMG, do I hear a Supra?

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