urQ Intercooler

[Todd Phenneger]

 Javad,

  I agree mostly.  But I want to add one thing.  It depends on speed also.  While this seems obvious there is an advantage to a deeper IC with less rows.  It has less pressure drop.  I believe this in mentioned in "The Book" as well.  But basically, if your building say a Rally Car that operates from 20 - 60mph for much of the time with a few squirts up to 100 then you want a large surface area and shallow IC that grabs LOTS of clean fresh air to cool it as you said.  But if your building a fast track car that will be operationg above 60mph much of its time frequently above 80 as well, then you can get away with a smaller IC that is deep as the amount of air flowing over the tubes is so great that it can deal with the depth and you get slightly less pressure drop (in theory, everythign else being equal of  course).    

   So, in relation to this ur-q IC, I would say that yes, its an improvement for a couple reasons.  One, highw quality core wont get heat soaked as fast and will be more efficient, also, deeper core is more mass = more heat dissipation and less absorbion per area = takes longer to get heat soaked = more power for longer.    I'm using an ur-q IC on my 10vt 4ktq and have also driven a 20v ur-q with one and in both cars it got heat soaked WAY to fast.  ESP in te 26psi ur-q.  2 gears and the IC packed it up and called it a day.  I can get to an full acceleration run but then after that its done, you can feel it, I have to drive neutral throttle on the freeway for a couple minutes for it to cool off.  But, I'm waiting till I can afford a REAL IC to re-place my grille wiht that will span between the lights and be very efficient.  But alas, Real IC's cost Real Money.   Grrr.

l8r

  Todd


  JShadzi at aol.com wrote: 
In a message dated 9/20/00 7:48:05 PM Pacific Daylight Time, 
marcswanson at mediaone.net writes:

<< 
I've got Bell's book too (don't have it in my house right now so I can't
reference the chapter to be certain..), but I remember the opposite.. A
thicker core is supposed to force more cooling since it (the air) must
absorb more heat lengthwise as it travels throgh a thicker core....
>>

I believe the way he describes it is that if you are going to increase 
the efficiency of an intercooler, it should not be increased in thickness but 
in the number of rows. By making the same rows longer, or thicker, you are 
reducing cooling efficiency because the same air charge passing thru the 
intercooler is being required to absorb more heat instead of using fresh, 
unheated air that would be used if there were additional rows. Basically, 
you do not want to make the same air, or aluminum, do more work when you can 
enlist a larger frontal area to advantage unused air that is not already 
heated (increasing frontal surface area). HTH?? its late, although if the 
only way you can go is thicker, than that is still an impovement over 
nothing...
Javad
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Todd Phenneger
    83' ur-q (awaiting a 20vt)
    84' 4ktq  fun but I'm sick of CIS.


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