Heat Exchanger Air Duct

Lonny

Administrator
Staff member
#1
We have put together a fresh air ducting system that gathers fresh air at the nose of the Goblin and cleanly directs the air across the heat exchanger.

It uses two NACA ducts, one on either side, as far forward as possible where the air is undisturbed.
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After collecting the air it directs it through a silicone coupler that is attached to a fiberglass plenum mounted above the heat exchanger.
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We made a fiberglass mold from a 3D printed prototype and sent it to our fiberglass shop.
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Kit price is $225 plus shipping.

Kit includes :
1 fiberglass plenum
2 NACA ducts
2 silicone couplers
2 hose clamps
2 steel mounting brackets
18 3/16 inch rivets
4 1/4-20 BHCS
4 1/4-20 nyloc nuts
1 template for NACA duct cut out

If you would like to have your nose cut for the ducts before being shipped add $40.
 
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Adam

Administrator
Staff member
#6
Does kit include NASA air ducts?

Brad
It does include the NACA ducts.

For people who have not picked up their body work, will you be able to cut out the portion of the hood where the intakes go?
We can cut the NACA duct holes for $40.

Do you supply a template for the cut out for NASA duct?

Brad
We will supply the template.

Are you ditching the fan with this setup?
Yes we are ditching the fan with this setup.
 
#9
I think these vents will help out quite a bit, but I think you're right though. I'm currently running the stock setup without body work, and my IAT2 temps can average anywhere from 30-35 degrees higher than ambient. There have been several times that I've gone for a drive with an 85 degree air temp, and the IAT2s are almost 110 degrees after I get home. That's with driving the last couple miles very leisurely. This could very well be normal as I really have no previous experience with IATs. Based on what I'm reading from other Cobalt owners, these numbers are a bit high.

I think having the intercooler sit right above the intake manifold has something to do with the the heat soak rate too. There is quite a bit of heat that transfers from the engine through the air and through the mounting brackets.
 
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ctuinstra

Well-Known Member
#11
I think these vents will help out quite a bit, but I think you're right though. I'm currently running the stock setup without body work, and my IAT2 temps can average anywhere from 30-35 degrees higher than ambient. There have been several times that I've gone for a drive with an 85 degree air temp, and the IAT2s are almost 110 degrees after I get home. That's with driving the last couple miles very leisurely. This could very well be normal as I really have no previous experience with IATs. Based on what I'm reading from other Cobalt owners, these numbers are a bit high.

I think having the intercooler sit right above the intake manifold has something to do with the the heat soak rate too. There is quite a bit of heat that transfers from the engine through the air and through the mounting brackets.

You've seen our setup. I have monitored our IAT2 temps until I just got bored of them. They can't be thought of and related to what you would with engine temps.

The IATs will go up under extreme boost and especially constant and often high boost. The boost is what creates the heat, obviously. However, under normal daily driving, they will actually go down with fairly open throttle because of the fresh air will cool the intake tract and air (along with the sensor). When at idle, there is no boost but the temps will go back up because there is not much fresh air entering the intake. But as soon as you take off, the temps will go back down. Now some of this is actually just the lag of the sensor whereas the actual air temp may be slightly different.

I don't think you will ever find the IAT2 temps to be much closer to ambient than 20* F during summer weather. I constantly see 95-110 during 75-90 degree weather. You are very right about the heat soak, I believe it plays a big role on the actual temp sensor also causing a lag in the readings.

I'd be curious to the actual water temp to see what it is. If it's just a degree or two off of ambient, then you can't really ask for more other than to change the intake setup and add more and larger laminova tubes. My HE never even gets warm, short of ice water, I don't know how I could get it any cooler.