Ducting air from the nose void into the engine bay

Right - for a variety of reasons, I would really like to get some additional cool airflow into and through the engine bay.

Have been kicking around the pros and cons of ducting air from the nose void via an inverted NACA duct, or even a pair, let into the horizontal panel that sits in front of the radiator top. Essentially, the duct(s) would funnel air up and over the rad; hopefully without overly robbing flow through the rad (and charge cooler secondary also in there) or, more importantly, without creating turbulence that prevents air penetrating the two sets of cores.

Seems to me it has the benefit of taking air from a notionally high pressure source where a boundary layer might just exist, whilst being hidden under the bonnet - not really wanting visible scoops or ducts on open show. Possible downsides are any prejudicing of the cooling system (I'm figuring loads of air 'leaks' around the sides of the rad anyway and that leakage probably serves to pull flow through the cores), and the potential for weather and debris ingress into the engine bay (the duct would be above/behind and shielded by the bonnet lip profile).

Initially at least, my air filter is going to be housed in the engine bay wedge/cossie style, and extra air throughput will obviously help that out as well as bring some cooling benefit. Discuss

Apart from having your air filter inside the engine bay (which I agree will turn it into a hot air intake and would do anything possible to avoid) I can't think of any other reasons to want to lower the engine bay temperature. It would be fairly hard to make much of a difference on these things and would require quite a large airflow, you're probably going to need to buy some bonnet pins to stop it shaking itself loose
What are you trying to achieve, if it's just for the air filter then an enclosed feed straight from the front might be a better idea than trying to reduce the entire under bonnet temperature..

The primary reason is to allow air at the filter - the tightest corner with a single turbo hung on the Y is the air inlet to the compressor. It faces out to chassis rails and steering gear so a bend in under the o/s manifold from the front is needed. Rather than then bend right and through the inner wing and all the way round into the nose (long pipework), I'm trying to use the volume that sits under the bonnet curve above the rad top area (there's loads more space there that you'd think); consequently, the duct I'm proposing would exit right into that volume and right in front of the filter which actually lies partly above the rad line. Any airflow introduced should exit either under the car into whatever low pressure exists there when moving, or maybe upward and out the bonnet vents with heat load... or will it?

It not at all about keeping IC temps down; mainly as it doesn't have one It's about ensuring there is sufficient air of a reasonable (if not optimum) temperature around for the intake to draw from when moving. If there's any cooling benefit to help alleviate soak than that's a bonus - pics on the 'garage last night' thread if that helps visualise

Yeah, I'm familiar with aquamist and it works well... Trouble is when something fails or the tank inadvertently runs dry. I'd prefer not to be dependant on that, and shouldn't need to be at the relatively low boost levels this will ever see...

Thinking outside the box - Have a look at the T350/Tamora/Sagaris way of using the air under the engine for the intake? Many have tried (expensively) to use forward facing ducts/pipes, but very few have demonstrated an improvement on breathing from underneath?

A large 2 or 3 inch duct straight down parallel/next to the sump either directly connected or feeding to an airbox for your intake may be an alternate?

Just trying to help?

T

Ok, found the thread about Ant's and do recall the open bonnet/closed bonnet thing now. Thanks for the reminder; interesting stuff

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