How to make a custom hood scoop

Written by vicki wright
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How to make a custom hood scoop
A hood scoop creates a whole new look for your car. (air control image by Ronnortx from Fotolia.com)

Functional as well as cool, a custom hood scoop enhances your vehicle's image. Originally designed to affect your car's air intake, bonnet scoops have evolved into aftermarket options that make your car look like a muscle car. People often perceive cars with bonnet scoops to be much more powerful than they really are. It can be quite expensive to take your car to a bodyworks garage for the installation of a functional hood scoop. A more affordable option is to build your own non-functional custom hood scoop and install it.

Skill level:
Moderate

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Things you need

  • Cardboard
  • Marker
  • Knife
  • Duct tape
  • Fibreglass resin kit
  • Drill
  • 1/4-inch drill bit
  • 1/4-inch screws and nuts
  • Cutting and tapping fluid

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Instructions

  1. 1

    Draw a pattern onto cardboard for the basic shape and size of your custom hood scoop. This shape should be drawn so that it is the top of your scoop, as it would look when looking down on it on top of the hood of your car. Unless you are planning to make your scoop functional, the scoop may be any size and shape that you prefer. Keep in mind that the size should appear somewhat proportional to the size of your car's bonnet.

  2. 2

    Create sides and a back (windshield side) by drawing them onto the pattern. Cut into the corners of your sides and back to ensure that they are the right size to create your three-dimensional model. Your pattern should be taller in the front (toward the grill) and shorter toward the back (toward the windshield) to reflect the curve in your hood.

  3. 3

    Cut out the pattern with a knife.

  4. 4

    Tape the model together with duct tape. An excessive amount of tape is not necessary. Use small strips to tape the sides and back together.

  5. 5

    Wrap the entire hood scoop model with cling film and tape it securely. Tape a rag strip to the bottom of your model, running all the way around the edges, making a rag border. The rag strip should not run the entire width of the scoop and should not make the scoop enclosed. This will become the part of the scoop that sits directly on the hood of your car, flat on the bonnet surface. It does not need to be taped neatly. You will be covering this up later.

  6. 6

    Combine the poly resin and hardener in your kit to create your fibreglass resin, according to the directions provided. A metal bucket or other container is a good choice to use to mix the mixture in. The ingredients should be mixed well with a paint stick or metal rod. A fibreglass kit may be purchased at most auto-parts stores or hardware stores. Use the included rag to apply the fibreglass resin to the hood scoop or use a disposable sponge brush to paint the resin onto the model. Coat it thoroughly. Smooth out any bubbles or uneven areas.

  7. 7

    Allow the resin to dry and set in a warm, dry place for at least 24 hours. When dry, peel the cardboard model away from the fibreglass scoop with your hand. Discard the cardboard model. You should be left with a fibreglass version of your hood scoop.

  8. 8

    Drill holes on the bottom of the scoop using a drill and 1/4-inch drill bit. Two holes on each side toward the front (grill side) and back (windshield side) should be sufficient. Drill holes into the hood where you want to place your scoop to match the holes on the hood scoop.

  9. 9

    Attach the scoop to your car's bonnet with 1/4-inch bolts and nuts. Tighten them down tightly to ensure that they are secure.

Tips and warnings

  • You can glue your hood scoop to the car bonnet with special automotive glue, if you prefer.
  • When drilling into your car's bonnet, drill slowly and apply cutting and tapping fluid to your drill bit. This helps to reduce friction and create a cleaner hole.
  • If you want your scoop to be functional, you will need to take more precise measurements regarding the car's intake and motor when determining the size and shape of your hood scoop.

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