billthe3

You could always remove the rubber seal and let all the hot air vent out in front of the windsheild. Good luck getting any cool air inside the car, but thats just a minor issue.

HansB

Finally finished mine



A lot larger, and quite effective if combined with
- closed floor
- vented hood
- ducting

333pg333

Love to see some more detailed pics of this setup Hans. I wonder how you have it ducted as there is so little room? Love to see under the car too.

JohnKoaWood

I have been toying with the idea of a hood vent ducted for the intercooler, and dual vents over the towers for engine bay heat escape ... I have a plan for paint this winter, and think that would be a perfect time for vent integration... I keep seeing these pics and I'm gonna start cutting my hood up... keep em coming...

vt951

Wow, your car is beautiful.

944obscene

Heat naturally rises so that shouldn't be an issue. You won't see a massive amount of airflow versus something like that larger vent in the 1st post, but those extractors should work quite well to help remove excess heat. Also, with the hood in a somewhat "Highpressure" zone, you'll see that the air traveling over those extractors will create a bit of a vacuum over the backside of each louvre since they're raised (protruding into the airstream). This should also minimally effect aerodynamics.

Rich Sandor

Looking at various factory cars with similar setups, I'd suggest positioning it so that you on the underside of the hood, you can seal the vent to an air tight dam around the intercooler/rad, to help suck the air out more efficiently.

Obviously this setup would only work for cars without the stock airbox and would need to take into consideration whatever intercooler pipes are being used. For cars with the stock airbox it'd only be a comestic upgrade, as I doubt it would aid any major cooling.

On the more serious race cars that will use them, an added gurney flap or steeper bend in the louver will help extract more air.

Engine bay hot air can be sucked out through smaller vents on the sides of the hood, or even just the very back of the hood.

Rich Sandor

Joe I think I will do what we discussed and have a second fibreglass hood to use for ITE with all the louvers.. we should use Lorenzo's car to test fit a air-tight dam for the intercooler/rad since he's got the MAF on his car already.

daigo

333pg333

Poor Lorenzo having to use all these nice new parts.

Rich, what you describe with the direct ducted i/c to hoodvent is what I've been waiting to do for some time. However the i/c pipes look to present a bit of an obstacle. I will now wait until I get the trackcar going and see how much room I have underhood, especially without a dizzycap which should allow a better path for the pipe. In the meantime I'm sure one of you resourceful guys will design and build a kit and we will be the benefactors.

David Floyd

4mm raised louver, should create its own vaccum and draw out already rising hot air, no before/after temp reading

When cold outside, you can actually see heat exiting the vents

Joe Toth

billthe3.......I started by taking an impression off the hood and then flipping it again to get the proper curve of the hood. Once I had the proper contours of the hood blasa core and bondo and a whole lot of sanding. Here's a pic of where I started and todays progress on cleaning up the part trying to get ready to make the mold this weekend.

Joe Toth

Rich, anytime you want to come and play and donate Lorenzo's car for mock-up I ready.

daigo

Hey Joe, Rich knows where I live.

BTW folks, Joe is the real deal. He's the fellow who designed and built the new splitter on my race car. It is by far the nicest I've seen. The pictures don't do it justice.

gt37vgt

yeh that techinique with the little blocks laid on the bonnet to get the compound curve is down right inspirting.
I wish I had got to spend more time with those pattern makers when I've been in varius tool rooms ..