[DeTomaso] Possible Hood Vents

[pantdino at aol.com]

It seems to me the test you did does not necessarily tell you anything 
about what will happen at speed, which is what you are worried about.

The test you did is mainly a test of your fans.  When I got my car in 
1990 it would overheat if it sat idling but would immediately cool off 
when I started moving. Replacing the stock fans with Meriahs from Hall 
instantly solved the problem.

I think I read somewhere that those hood vents everyone put in in the 
1980's to mimic the later Panteras really didn't do anything for 
airflow thru the radiator.

If I were you I would get a fiberglass hood to experiment with -- it 
will be easier to work with, weigh less for the race, and if it's ugly 
you can switch it out when you're not racing.

Jim Oddie








-----Original Message-----
From: Art Stephens <artstephens at verizon.net>
To: detomaso at realbig.com
Sent: Fri, Jun 26, 2009 6:18 pm
Subject: [DeTomaso] Possible Hood Vents










You have been invited to view Art's photos!     I am considering 
cutting holes
in my original hood.  I recently did a cooling system test on my car 
with the
hood latched in place then again with the hood up.  After getting the 
engine
good and hot by driving,  I pulled it into my backyard and let it idle 
until it
wouldn't get any hotter.  After 30-45 minutes,  the temp reached almost 
230
=0
Adegrees where it leveled off.  I then opened the hood and watched the 
temp go
down.  After another 30-45 minutes of idling,  the temp dropped almost 
30
degrees.  The air temp was about 78 degrees.  I know there are guys out 
there
that have adequate cooling systems without opening the hood but this 
just seems
too easy!  The link below includes pictures of my proposed hood 
modification.  I
painted the area in black that I am considering cutting out.  The black 
area
pretty much maximizes the useful area that can be cut out for my lay 
down
radiator without cutting into the frame of the hood.  Initially I just 
want to
leave an open hole to maximize the cooling effect.  If I am not 
satisfied with
the appearance,  I can always make up a screen or grill to change the
appearance.  I realize that with the large opening,  I will be able to 
clearly
see the headlight bar running across the underside of the hood.  I plan 
to paint
most everything in view under the hood, flat black.  I also figure I'll 
wind up
painting the hood a matte black.  I am hoping this modification will 
also reduce
front end lift.  Aerodynamics of the car will be important as I plan to 
run the
car at very high speeds in the Silver State.  I don't want to screw up 
the aero
by cutting these holes.  Some have suggested buying a fiberglass hood 
to do the
modification instead of cutting 
up an original.  Any idea what  
original and
fiberglass hoods are worth?  What do you guys think?

Art






       If you can't see the pictures in this email, click here to see it 
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      Hood Vents (1 album)
      Art has shared photos with you.

       You're invited to view my online photos at the Gallery. Enjoy!


      - Art


      View photos

       Reminder: – You can save these photos after viewing them by 
creating a
free Kodak Gallery account.


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