3800SC Aftercooler

[FieroDough]

Not my craft work, was "borrowed" from the 3800sc mailling list. But seems very creative and afFORDdable (hehehe, little play on words)

here is the text:

Here is a pic of the bottom plate, it's 1/4" thick.
I will be useing one 1/4" plate on the bottom and one
on top, with two 1" plates in the middle, for a total
of 2 1/2" total height.
I have a coupe, so I will not need to cut as much off
the decklid  as a GT would neeed.
I'm going with a differant IC core than what ZZP
uses, they use a (Probe)Alum core, I'm going to try a
brass one from a Ford Escort.
I blew compressed air thru both cores and the brass
core seemed to flow more air, and I beleave that brass
will cool the air better than Alum.
I have read that ZZP's IC will drop your boost about
2 PSI, so maybe this core will do better.
I'm welcome to any input you all can give me!
Thanks.... Steve

End quote.

here are the pics:

[FieroDough]

pic 2

[FieroDough]

pic 3:

[aaron88]

Somedody forgot to give this guy a lesson in thermal conductivity.

Brass is used because it is much cheeper to mold.
Let's see...the thermal conductivity of:
Silver                        0.41
Copper                     0.40
Aluminum (99.9+)     0.22
Aluminum alloys        0.16
Brass (70 Cu, 30 Zn) 0.12
(Elements of Materials Sience and Engineering, sixth edition, Lawrence H. Van Vlack)

So that's what? Silver and Copper are almost four times as conductive as Brass.  I'm not even going to get into how you can boost those numbers by simply paining the surface black (thin).

Aaron

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[JoeLutz]

That is a heater core right?  It's probably copper not brass.  

 The pressure drop is mostly due to the fact that the cooler charge is denser and the roots blower is a positive displacement supercharger.  Therefore if the charge is cooler then the air displaced wants to take up less room hence less pressure.  Look at Ideal gas law.

Nice work.  Keep us posted.

[aaron88]

I concur with your statement Joe but I don’t think it’s a good idea to be looking up the ideal gas law because the air going into this unit is hardly an ideal gas (especially here in Ottawa with our humidity levels).

In laymen terms, if the cooler is working then it’s cooling the air which means the air after the cooler is cooler therefore denser therefore takes up less room.  Taking up less room means exerting less pressure.  Ideally to compensate the inlet should be proportionately larger than the outlet (proportionate to the efficiency).


Aaron

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[aaron88]

I know that unit should be Copper, but it really does look like it's Brass.

Brass???  Cheep, cheep, cheep!  Do I hear birds?

Maybe I'm just a little rusty on my metal colours, but, that thing would have to have 4 times the surface aria to be as good as a Copper one.