Due to the large radiator placement at the front of the engine it is quite difficult to get cold air running though the intercooler. 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.

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.

This is reflected in many modern performance cars such as the Mitsubishi Evo where the bonnet has conspicuous vents across it.

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 Much heat comes from the exhaust part of the engine so a vent a few inches behind that area will do much to reduce the under bonnet temperature. 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.

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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.) 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. The downside of having a top mounted intercooler is when the car is stationary it is actuallynot getting a flow of air through it but when you think about it if a car is stationary the lastthing you want is performance.

You needn't just have vents in the bonnet you can also place them in the wing in a BMW style shark gill vent. A good vent design on a bonnet makes provision for both cold air to get in and a route for the hot air to exit.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.