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Hot air and Pflows



>the reason you cant get a pflow is because a CIS(e) engine uses a mass
>airflow plate over the airbox to tell the engine how much air is going in and
>calculates how much fuel to use.

True, but for those of us who are swapping injections systems down the road
for one reason or another, the use of a Pflow might apply.  Also, some of us
already have drilled airboxes and might now be wondering how to eliminate
the hot-air factor:

>You dont want to drill out your airbox (punched airbox) It or buy a pflow
>type kit. they just make your car loud and suck hot air.  A scoop (ram air)
>system is better because it draws cool air from outside the engine
>compartment.  ABD now makes a kit to enclose your pflow to run it to a scoop,
>why would you remove a airbox and replace it for the scoop?.....You shouldnt!
> Fashion yourself a scoop and youll get all the air you need, VW's have good
>intakes anyway, so save your $$$.  If I recall a drop of 10 degrees is good
>for 1hp or something, May not sound like much but that engine compartment
>gets hot.

1.  If you run a scoop up into the engine bay (the kind that picks up air
from below the car in the air stream and runs it into the engine bay), make
it small in diameter.  Here's why:  when you're going 130mph, you're
creating a vaccum-effect in your engine bay.  130mph winds are pushing UP on
the inside of your car, and can give you a very floaty, dangerous ride.  

2.   The swiss cheese airbox and pflow provide easier flow of air (good) but
bring in hot air (bad).  It is believe (by me) that the two cancel each
other out--but getting rid of the hot air will of course help a bit, since
you're eliminating the downside--the hot air.  An EXPENSIVE way to cool your
engine bay area is this:  buy a header and coat it w/ a protective,
insulating material (ceramic).  I am buying a Velocity header (for
8v--@$175.00) and having Jet-hot coat it for @$125.00.  They claim engine
bay temperatures to be lessened by 30-40 degrees (F).  You get a few HP from
the header plus a few more for the cooler air.  Your swiss-cheese airbox or
pflow will also actually gain from it too.  The s.c. airbox and pflow
provide easier flow of air (good) but bring in hot air (bad).  It is believe
(by me) that the two cancel each other out--but getting rid of the hot air
will help a bit.

I saw a post once of a guy who had this general idea (cooling = power) and
asked this question:  "Why not just put dry-ice in the airbox for some
cool-ass air??"  <G>!!!!  I hope you all know what dry-ice is made of
(CO2)!!!!!!!!!!  That'll burn REAL well in your engine, dumbass!

Chris Taylor
'87 Scirocco G60-to-be

      Virginia Polytechnic Institute 
          and State University
         College of Engineering
chtaylo4@vt.edu ::::: chtaylo4@aol.com

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