Car Bonnet Air Vents, 1 Pair Decorative Car Styling Air Flow Intake Scoop Side Vents Universal Exterior Bonnet Hood Vent Grille Cover Self-adhesive Vent Stickers Stick on Bonnet Vents

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Some manufacturers have got round this by putting the intercooler on the top of the engine and feed cold air through a vent in the bonnet. Some TorqueCars members have cut vents into their bonnets as they see the performance gains on offer without being interested in the styling benefits. Cold air is your friend - it carries more oxygen so the addition of vents can dramatically cool the engine bay and feed fresh cold air into the engine.It also help prevent the engine from overheating and reduced the load you are putting on your engine oil. Due to the large radiator placement at the front of the engine it is quite difficult to get cold air running though the intercooler. This heated intake air is pulled through an intercooler which helps to reduce the air charge temperatures but for this to work effectively the intercooler needs cold air flowing through it. To alleviate the issue of misting up inside the car during wet conditions, we have a range of heaters and inline blowers to direct air towards the windscreen. These vary from standalone electrical systems to plumbed in heater systems.

Some standard cars have this arrangement and a scoop to feed the cold air through the intercooler (the Subaru Impreza for example). Bonnet vent styles. They do perform a useful function in keeping the under bonnet temperatures down and help with performance, which is a subject we discuss in the TorqueCars tuning section more fully. The larger the vent the bigger the effect this will have on the cars aerodynamics so don't go too mad. Some manufacturers have got round this by putting the intercooler on the top of the engine and feed cold air through a vent in the bonnet. In supercharged engines and turbo charged engines the intake air is further heated by the compression process. Before you take an angle grinder or jigsawto your car plan in advance. Mark out where the main support frame is and avoid cutting it as this will dramatically affect the rigidity of the bonnet.

Bonnet vent styles.

For the time and hassle involved you are usually better off going with a pre cut bonnet and fitting that instead of the standard one. Near the air intake filter so cold air from outside can be pulled in. A little additional ducting will help channel more cold air to the filter and stop the warm under bonnet temperatures from entering. (Avoid putting the filter in an enclosed box with cold air feeds as this will alter the induction length see our cold air induction article for details.) I did think that the open mesh vents were the cause of the corrosion (due to water ingress) until I saw that MajorTom has it on his car which has the shrouded vents.... viewtopic.php?f=27&t=5347

Bonnet vents are also popular in motor sport and the Mitsubishi Evo bonnet has conspicuous vents across it and the Subaru Impreza has a top mounted intercooler with a bonnet scoop.

If you are cutting a vent into your cars bodywork we suggest removing the part and cutting from the rear. This is what I’ve done to help prevent potential water ingress issues through the vents viewtopic.php?p=59388#p59388 ( NavigatorNI mentioned earlier that he’s done something similar).