source for engine heat hood extraction vents

Discussion in 'Body and Interior: Repairs and Modifications' started by grumpyvette, Jun 12, 2014.

  1. grumpyvette

    grumpyvette Administrator Staff Member

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    adding a high rise hood allows a much larger choice in intake designs that will fit under the hood, but does little to reduce engine heat trapped under the hood, and while I know I'll hear screams from those purists the fact is that hood vents to reduce under hood head and reduce front end lift on race corvettes have been used for decades.
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    keep in mind that if you can increase the radiator fans efficiency "and thats done partially by reducing and resistance to air flow exiting the engine compartment" you can increase the air flow mass absorbing heat as air passes over the radiator fin surface.
    remember the c4 corvette sucks air from under the car, so at lower travel speeds the electrical fans are responsible for the vast majority of the air flowing thru the radiator, as vehicle speeds increase a increased air pressure builds under the cars nose increasing air flow rates thru the radiator.

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    adding hood vents like these pictured above are mostly for show, and in my opinion some styles just look bad! (as in CRAPPY)but any decent size vent will help lower engine heat (MARGINALLY AT LEAST ) if they are to small to be ideal
    if you have a good source for vents that you think might look good please post some links, but keep in mind the panel that you cut below is limited in size to about 9" wide and 12" long on each side
    Id also point out that its been conclusively and repeatedly proven that fairly large and rear of the upper hood area, hood heat vents that allow air flow trapped under the hood to escape reduces front end lift at high road speeds this both reduces the power required to push the car too speeds well in excess of 130 mph, it also noticeably improves high speed handling

    http://hoodlouvers.com/autobahn-test-results/
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    http://www.hoodlouvers.com/products.html
    adding a larger area hood vented panel to each rear panel area thats about 9" x 12" indicated ,increased air flow rates enough to lower engine temps a measurable amount,plus it tends too lower front end lift at high speeds, especially at high track speeds, larger vents like these will help lower engine heat and they are large enough to be closer too ideal
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    the rear panels are almost placed as if designed as a good location for heat to exit the engine compartment if the proper vents are added
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    Last edited by a moderator: Nov 15, 2016
  2. 87vette81big

    87vette81big Guest

    Callaway Motors had the best looking Hood Vents on the C4 1987-91 TT.
    Ducted air to those twin intercoolers.
    Opposite of your intentions Grumpy removing hot air.
    But comes to mind as timeless styling.
     
  3. grumpyvette

    grumpyvette Administrator Staff Member

    theres an interesting post on metal vent grill screen
     
  4. grumpyvette

    grumpyvette Administrator Staff Member

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    I've wanted to cut out the areas indicated and install heat extraction venting, as I know from previous cars that adding the vents in the hood increases air flow rates and can drop under hood temps by 20F-40F this generally helps both engine oil and coolant temps and reduces intake manifold operating temps allowing a cooler and denser fuel/air mix and a bit more torque
    I found a source for chrome or stainless perforated steel sheet cut to approximately the correct size for heat hood extraction vents, now I just need to figure out a cosmetically pleasing and STRUCTUALLY SOLID ,functionally strong way to install the perforated vent panels in the hood, so they look decent,and work correctly. hood vents added alone can frequently lower engine temps 15F-20F degrees, swap to ceramic coated headers and hood vents and a 60F -70F engine compartment temp drop is common

    http://www.greenwoodvette.com/options.htm

    so if you have and Ideas please post them

    http://www.onlinemetals.com/merchant.cfm?id=1643&step=2&top_cat=1
    http://www.onlinemetals.com/merchant.cfm?pid=13507&step=4&id=1643&top_cat=1
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    Last edited by a moderator: Nov 15, 2016
  5. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member

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