Thread: Bonnet vents

Originally Posted by Didge

Hey TheStig, if the vents make you happy then that's all that matters. If people are worried about air flow and as Jeff above said, the "a" word (aerodynamics) then they've bought the wrong car and in a really big way. Anything you can do to bling up an older Defender can't be that bad (makes them look less tired, keeps us enthusiastic and that helps us keep the car on the road) - I've wondered about getting some of those late model Disco side vents on my old girl just to tart it up a bit

Read the post above yours, it isn't about aero, it's about getting the hot air out of the engine bay.

The Defender engine bay is atrocious, air doesn't flow out fast enough and so becomes a high pressure region so air doesn't flow through the radiator well enough for optimal cooling.

No, I haven't taken pressure readings in the engine bay but I have enough anecdotal evidence (that I don't have time to go into ATM) to suggest this is the case.

Firstly I would just like to thank everyone for their opinion and secondly I would just like to inform all of you who are concerned about the aerodynamics that I have not lost any fuel economy (so musnt have any effects on the aero) and they are actually prolonging the life of the engine because when you go 4x4ing u don't have a high air flow in the engine so all the heat is trapped, these vents let the hot air escape.