Well the topic of venting the hood keeps coming up, and well I think I want to try the two naca ducts on the hood to vent that air. Where we should put them, and what size to use is up in the air, but when we come up with a plan would you want to try our hand at the intall? My hood needs paint anyway, I figure if we butcher it no biggie, but I would rather give it a go than pay someone else to....

Any takers on a little home made hood venting?

It is that or punch some luvers in it...

 

Are those vents nothing more then a hole in the hood? It looks like there is more to it then that.

 

Ian,

I think a couple of reversed naca ducts are the way to go. If your solely interested in venting the radiator/intercooler, I'd place the openings just forward of the t-belt cover.

I'm no expert, but I'd imagine that they could be pop-riveted in place, then use a little light body filler to clean up the edges, then paint to match.

Maybe SHAUN could work his photoshop magic, and give you some idea's?

Bryan

 

Maybe that tow truck driver that popped Bryan's door could help us. I mean he did such a great job getting into the 944.

 

Ian.

I am up for the challenge and YES there is much more to it than just cutting a hole in the hood. I have been kicking around a two-piece molded plastic backing conformed to the underside of the hood. This will help to do two things.

1. Complete a good seal to the intake piece
2. Provide a reservoir to ketch and release incoming water.


I also have the thought of adding in some type of screen barrier to prevent any debris from reaching the filter itself. This will be a low pressure intake not ram air so the only real concern is that there is an even airflow into the intake. It is possible to create a slightly higher-pressure air intake especially at speed but I am not sure of the effect on the motor at that point. If you all jump under your hood and remove the entire air box you can see just how much room there is to work with. I believe that this would be a lot more than a decorative ornament we could possibly get an extra horse or two out of my little N/A this way..

Please input is requested and necessary.

Thanks
TaboII

Ian I have the tools to get this project off the ground we only need the time and a little expert input fro the guys to kick this off. We could even replicate the GT hood scoop out of fiberglass as I have worked with this in the past. Let me know what you would like to do

 

Do you remember the tool he used to pop the lock? It was a big pink steel rod with a hook on the end. The car took it rather well though, she hasn't complained yet! <img src="graemlins/roflmao.gif" border="0" alt="[hiha]" />

 

Well the real insperation from being stuck at the gas station was the guy that had the SUV with 20 inch davin spinners, nothing like making a car look like it is moon walking.... lol....

Tabo,

I am trying to create a vent system for the intercooler, not a ram air system (guru racing is working on that). I just think underhood temps are too high on 951's. The intercool is so high that the hot air can't escape out the bottom and in the end I think it adds to heat soak. Lots of places have vents for the nose pannel that let more air in, but I want to let more air in and let more out. So the Naca ducts would be placed backwards to vent the air, there by lowering temps....

I'm not sure if i want to put them after the intercooler or higher up over the headers and turbo....

We will figure this one out....

 

I have a slightly different thought on what Ian first mentioned - venting the air. I'm not sure what actual results are desired, but if it's just a reduction in underhood temps, it would make sense to install a NACA duct or two on the hood and create a low pressure area just over the top. This would greatly aid in evacuating the heat, you won't have to worry about rocks, birds or small children being blown in, and it could really be rather 'stealthy' (not popping out of the hood). Granted, for it to work well, you'd need to check air-flow through the engine bay from the front (or where ever the main air inlet might be) and ensure that the negative pressure would have something to 'suck' out.

I've been fussing with something similar on a motorcycle (flippin thing is an oven in the summer) - but keep having the problem of no effecient way to keep the system equalized.

Or maybe you just want to bring in more ambient air (where would it go? no good escape route and the temps will be similar). Or are you thinking about ram-air (starts being usefull around 80mph on motorcycles)?

 

Ian, I'd been thinking about the hood vents since the autocross (and actually before). I'm not sure if reversed NACA ducts are the way to go however. I'm not convinced they flow cleanly in reverse... ( I could be wrong, however)

I was thinking more along the lines of what the 996 TT uses, the slot between bumper cap and hood - only, we'd need 2, of course because of the hood bracing (and the archetecture behind the IC itself). I'm thinking I've seen this sort of thing on a domestic in the last 10-15 years or so - a scoop, slot shaped (I believe it was vertical, with a rolled side and the surround made ito it, one piece, fastened to a hole in the bodywork. It seems we could sourse some sort of pre-existing vent and replicate the opening in the original car's bodywork (make a template from the donor car) and fasten it cleanly in our application...

Maybe the vent I'm thinking is from a Knight Rider era Trans-Am or something, I can't remember...

 

I am happy to donate the hood on my car as the test mule. I wish we had a way to get the temp before and after the intercooler before and after the changes just to see if it is actually helping.

I think the naca ducts will work, there are a couple different stles, the kind I want to use are these....



And I know this is crappy, hell i did it in paint in 2 min just to give an idea.... But anyway this is where I am thinking of putting them...

 

I was thinking more like these (but less rounded. obviously)
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1857860235" target="_blank">fender vents</a>

 

or these.... (bigger)
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1858629956" target="_blank">more vents</a>

 

I like the idea of the first ones, but really i'm going for function over form so what ever way this materializeses as long as it works i'll be happy (that said I don't want it to stick out over the hood so it draws attention)

 

yeah, I think subtle is better, and clearance is an issue over the engine, so I keep visualizing something that lives above the belt area...

 

Why don't you just get a 968 Turbo racer intercooler vent, and the thing to direct the air out the vent? I'm sure someone (GT Racing?) makes one for people who make have 968 Turbo racers.





Maybe something more subtle like



Good luck,
Matt