[s-cars] FMIC info digested...

[Marc Swanson]

On Wed, 2005-11-02 at 15:25 -0500, djdawson2 at aol.com wrote:
> 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  ;-)

yep, true.  A lot of that probably had to do with parts availability.
I'm sure it was easier to find a bar and plate in the dimensions he was
looking for than a tube and fin.  Generally speaking it is hard to find
thick tube and fin cores, especially in large LxW.  Most of the large
truck ones stay relatively thin, about 2" max or so.

>  
> 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.

I apparently defined a new kind of heat transfer ;)

What I meant to say without consulting my physics book was conductive
and radiative heat transfer from the engine bay.  And you're right,
conduction affects the manifold a lot more than it would the FMIC.
Radiative heat is certainly still an issue at the drag strip.  Ask
anybody that monitors intake temps at the drag strip.  Intake temps go
way up in the staging lanes.  BTDT.

>  
> 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.

25% seems high, but I can believe some radiative cooling at rest.
 
> 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. 

correct.

>  Believe it or not, a block of ice at 32F has a significant amount of stored HEAT energy...

sure.  Water holds amazing amounts of heat.  A quick look at the
specific heat gives that away.  That's why water injection has always
piqued my interest, but thats another topic entirely.  Getting off topic
now, so...

> Anyway..

exactly. 

I'll come back with numbers when the opportunity presents itself.   Now
I just gotta figure out how to use the 034 Stage IIC as a standalone
data logger ;)


-- 
Marc Swanson
95.5 //S6 Avant
90 CQ 4.2 V8 project car