Here it is.

Scroll down to Post #11

https://rennlist.com/forums/showthre...highlight=vent

 

Just speculating....Maybe he has more to add by now.

 

Korky Bell recomends an inlet size of 20% the frontal area of the IC. The stock design is 46% the area of the core and sealed with the plastic shroud.
I also measured the pressure data at different areas along the flow path, I can not remeber what the numbers were but there is a substantial pressure build up and then drop as cooling air flows across the IC.

The inlet is also in the highes pressure area of the nose and with a flush auxilary inlet there is less pressure which means air would escape from the IC duct. I did a project in a fluids class and saw the flow lines for a 951 going 60 MPH.
Conclusion, I do have some data and it is not perfect but gives a MUCH better means of evaluation than guesses and from this I would not put a vented pannel on unless it is a raised design to clear a taller IC.

 

azmi951,
Any chance you can dig up some of that info?

What other factors did you consider? I don't think NZ was the only one to measure cooler intake temps with the vented nose panels. Have you done anything with temps?

What about air volume? The air pressure may be higher in the stock configuration but if the vent allows more volume through the IC, could that improve the cooling?

Obviously, I'm not an engineer so I have to ask.

 

Is our IC panel thin enough to use some good tin snips?

 

Also, slightly OT, but how hard would it be to take out stock IC, cut the end caps, and just reweld to a bigger core?

As you can get heat exchanger cores pretty cheap. They only get expensive when you call them intercoolers

 

Would an IC sprayer yield better results then the vented panel? About the same cost.

 

I did nothing with temps since temperature is a transient condition. However the proper way to evaluate intercoolers is but the NTU effectiveness method. This differs from efficency in that it considers the physical properties of the heat exchainger not the results (temeperatures) at one condition.

The air volume is easy to measure, take the surface area of the inlet or IC and take a velocity and pressure reading there. You will then know the mass flow rate of cooling air. The higher it is the better the duct.

I will dig up the data tonight.

 

IMHO YES!!! but you have to keep it filled to work.

 

A bit off topic, but has anyone come out with a heat-extractor hood to help draw air through, and heat out?

 

A very few people have installed a 968 turbo S type extractor. It will take a dive into the archives for me to find a picture.

 

How much of an issue is the scavenging of air through out engine campartment. The top is pretty well sealed leaving the air to be sucked out from underneath.

How much of a benifit do you think a 968 turbo type scanvenger would be?

 

 

Ewwwww that white one looks terrible, I bet it makes no power at all, and its all for show. lol

 

Not as slow as white intercooler pipes....