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Re: Cheesing Air box




On Thu, 16 Sep 1999 21:55:29 EDT Vaughn8v@aol.com writes:

>Hey pal, no reason to get huffy and go name calling!  


Well, actually I wasnt huffy at all. I was quite calm and rather confused
by your post. 


>Forgive me if I came 
>across as doing anything but expressing my dissagreement in a what I 
>thought was a friendly and passive manner.  


Thats fine but when you dissagree, please have an oposing view! LOL!!
To be frank, nobody asked for, nor did I offer any info on the effects of
swiss cheezing an airbox. So what is it exactly is it that you are 


>Hey, when I think of a slice of Swiss 
>cheese, I think of holes on more than one side of it!!  


Easy there. Relax a little, it will be ok, really. No need to get all
high strung. Sit back, sip some good rum with me and feel the vibes while
we share what we know. 


>Infact I think that a 
>slice of Swiss cheese is nothing short of imposterous if it is not 
>covered with holes on every side!!  :)  Incidentally, I still
disagree...


Calling the act of cutting lots of holes "swiss cheezing" is only a
figure of speach. Its not to be taken liturally. 


    
>I am curious as to how you conducted this exstensive underhood
temperature 
>testing?  Don't get all bent out of shape man, I am just curious.  

Dude, you dont need to explain yourself. Im happy to share what info I
learn with any and all who ask. I never get bent when asked a legit
question. 

What I did was used 2 multimeters equiped with temp probes. I installed
one probe in the filter section of the airbox and one behind the bumper
(Roughly whre the stock air sensor location is on MFA equiped cars.).
Then I did some driving and as best I could, (traffic, stoplights ect.) I
drove at various constant speeds using 4 different air box bottoms. 

1) stock box
2) 3x1" holes on the fender side of the airbox
3) holes on the bottom and the fender side of the airbox.
4) no bottom of the airbox below the filter. Just the structural supports
remained. 

I had a passenger log the speeds, outside air temps and airbox temps. 

Then I moved the outside air probe to the intake tube before the throttle
body and repeated the tests. Because it was much later in the day the
outside air temps were different but the air temp before the TB was the
same as what was in the airbox. 

My last test was done in my GLi. Since it has a MFA I simply used its
outside sensor and rigged it up with the probe in the airbox and the
other one before the TB. 



>I am not 
>saying that you lack any, nor am I undermining any ability you may have
to 
>conduct innovative testing in a conclusive fashion either.  Geez,
especially 
>for the sake of deriving ideas and theories for the sake of improving
the 
>performance of Sciroccos!!  Again, I am just curious.  


Thats how I did my tests. I cant find my data sheets that we collected
and I also dont have access to the 2 multimeters or I would do a top end
test with the temp probes in the car. (I didnt think about it or I would
of done it!) 


>In a space such as the engine compartment of a car which is mostly
enclosed 
>except for the underneath and the front grill (which is blocked mostly
by the 
>radiator anyhow), an engine combustes gas at extremely hot temperatures.



If this were true, the air would not flow THRU the radiator and cool the
coolant in the radiator. Air also flows around the radiator, thru the
headlight mounts and also from under the car. Most of the air flows in
thru the front of the grill, either thru or around the radiator and exits
under the car. 


 
>Granted, there are cooling devises that keep this temperature somewhat 
>reduced.  But if I take my 16v out for a high speed high rpm freeway run
on 
>a, let's say 55 degree day, when I get back and park my car, my hand
will 
>feel that the hood is nice and warm.  Granted at that point the car is
not 
>moving.  But I bet that if there was a way to feel the hood with your
hand at 
>freeway speeds when the engine is running cooler, the hood would still
feel 
>nice and warm.  So how can there be virtually no air temp. differential 
>between outside air and the air on the engine side of your airbox at all

>times when driving your car?  


Because that air is comming from outside the heatr source. 
Do this. 
Upen the hood and on the drivers side on the firewall, remove any plug
you see so the air can flow into the car. (Preferably where YOU can feel
whats comming in the hole.) go drive the car  and get back to me. 



>The idea of drilling holes in the airbox is to increase positive cool 
>airflow...  


Wrong. The idea of drilling holes in the airbox it to free up the flow
going into the filter. If you want a definate cool air flow to the
engine, you should route in some plumbing directly from the outside air
source. 



>P.S.I aint trying to piss people off, especially in a forum of 
>Scirocco enthusiasts.  Sorry if I came across that way to you.


Nobody said we had to fight to disagree. Lets be civil and enjoy the
different points of view. I never said you said or did anything wrong. I
just pointed out your error. 


              Shawn Meze
86' Jetta GLi           82' Scirocco GTi
The Fastest, Quickest, Cleanest and
best looking Scirocco in all of San Diego!
http://www.Geocities.com/MotorCity/Speedway/1308/index.htm

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