[s-cars] FMIC info digested...

[djdawson2@aol.com]

If Javad is selling a tube and fin FMIC, he's probably got a good reason... I won't argue that.  However, the IC that he runs in his own car appears to be a bar and plate  ;-)
 
I'm not ignoring heat transfer (conduction)... there isn't any of substance.  You're comparing an IM that is connected to the cylinder head vs. an IC that is literally feet away, and thermally isolated.  Apples and oranges.  And no, I haven't wondered why my IM is hot... it is patently obvious... hence the past discussions on utilizing a spacer between IM and head for insulation against conductive heat transfer.
 
BTW, there's no such thing as "mechanical heat transfer."  There are 3 means of heat transfer... conduction, convection, and radiation.
 
"When there exists a temperature gradient within a body, heat energy will flow from the region of high temperature to the region of low temperature. This phenomenon is known as conduction heat transfer, and is described by Fourier's Law."
 
I'm not ignoring airflow either, and never stated that an IC would do its job with no airflow... although it still does have about 25% efficiency, even if there's no flow.
 
When you state that:
"the bar and plate has the ability to STORE more heat energy due to its mass, correct?  As a result, it needs to get rid of MORE heat energy to reach a given temperature"...
 
It's clear that you are talking in relative terms.  Believe it or not, a block of ice at 32F has a significant amount of stored HEAT energy... but in relative terms, it is cold.  Any object that is above absolute zero, is storing heat energy.  Every object that we encounter in our daily lives is storing heat energy... including a "cool" IC.
 
An IC of considerable mass (BAP) that is at a temp below high boost turbo outlet temps (350ish F), has a significant ability to transfer heat away from the intake charge... much more than a low mass TAF.  That's just simple fact.
 
Anyway....
 
Dave
 
-----Original Message-----
From: Marc Swanson <mswanson at sonitrol.net>
To: djdawson2 at aol.com
Cc: gcmschemist at gmail.com; tmullane at gmail.com; s-car-list at audifans.com
Sent: Wed, 02 Nov 2005 14:28:44 -0500
Subject: Re: [s-cars] FMIC info digested...



You are ignoring two factors:  mechanical heat transfer from the engine
bay, and airflow through the intercooler (both internal, and external).

Ever wonder why your intake manifold is screaming hot when you open the
hood with the engine running?  Intake manifold temps rise when the
vehicle comes to a stop, significantly.


>   BTDT at the drag races.  It remains very cool the entire time. 

Are you saying an intercooler can do its job with no significant airflow
through the core?  I dont buy it.


>  In fact, during that first 100 feet, the tube and fin will heat up more 
because airflow is low, and stored energy is low.  We're talking thermodynamics 
101 here.

I disagree, but again, we need numbers here.  Just to make sure we're on
the same page, the bar and plate has the ability to STORE more heat
energy due to its mass, correct?  As a result, it needs to get rid of
MORE heat energy to reach a given temperature.  Granted, thats where the
higher efficiency comes in.