[DeTomaso] Fw: Possible Hood Vents

Fri Jun 26 22:44:11 EDT 2009

> "Art,
>
> I'm no engineer, but leaving the car stationary while having the hood
> open, at least to me, makes sense you'd get more cool down, simply due
> to convection of the air naturally trapped under the car. My bigger
> question is, would holes of that nature in the hood actually contribute
> more to cooling when the car is moving and constantly evacuating air
> from underneath?
>
> And, NO, do not cut up a perfectly good hood.
>
> Asa Jay"
>
>
>  AJ,
>        I'm guessing that the air will evacuate from the under the car at 
> any speed.  But I think to a certain extent,  the air from below may be 
> fighting some ram air effect from above?  Due to the slope of the hood, 
> the back of the opening will be higher than the front.  Potentially the 
> ram air may be more powerful than the air trying to escape from below,  in 
> which case there might be more front end lift than stock?  It also 
> wouldn't surpirse me if the openings add a certain amount of drag?  I 
> wouldn't mind adding a little drag if front end lift is reduced.
>
> Thanks,
> Art
>
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> Art Stephens wrote:
>> 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 degrees 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.  Init
>>  ially 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 
>> in a web browser:
>>
>> http://www.kodakgallery.com/ShareLanding.action?c=j9zz6vq.2julyndy&x=0&y=-6d8nbm&localeid=en_US
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>       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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