the GT's hood louvers - Ford Mustang Forum
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post #1 of 16 (permalink) Old 03-22-2016 Thread Starter
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the GT's hood louvers

I love the louvers on the hood. They add a lot and look just plain cool. But I have 2 questions:

1) Other than decor, do they really serve any purpose? I can see where they might facilitate air flow through the engine compartment, but that effect would have to be minimal at best.
2) By looking at the underside of the hood, I can see where water drains. But I think it interesting that not a trace of water hits any components underneath. That trough that catches the water is well designed!



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post #2 of 16 (permalink) Old 03-22-2016
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Here's a theory base upon having had both a 2012 BBP and a 2014 BBP. The '12 had a nasty habit of having a little hood lift at high speed, making the front end light. The 2014 doesn't do that. I suspect the underhood pressure relief of the hood louvers may be the cause of this improvement.

The water drips right on the airbox lid, typically, obviously no harm done but, that's why panty-waists get all concerned with drips on their open element CAIs.


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post #3 of 16 (permalink) Old 03-22-2016
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I think they serve two functions. They do allow heat to escape and they probably relieve air pressure as has been previously noted. If you park the car on a cool day and put your hand over the vents you can definitely feel the heat escaping. Most modern cars run hotter than old cars did and the under hood area is pretty tightly packed so I think anything that can be done to let things cool down a bit is probably a good idea. The under hood packaging between my '14 GT and my small block '72 'Cuda is like night and day. The 'Cuda came from the factory with a pretty large three row radiator and you have to really hammer on it to get it much over 180 degrees even on a hot summer day.
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post #4 of 16 (permalink) Old 03-23-2016
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Early morning sitting at a light on the way to work watching the heat waves emanating from the louvers - pretty cool (pun intended)
They are clearly relieving under hood pressure at speed and releasing heat from the engine compartment.


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post #5 of 16 (permalink) Old 03-23-2016
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Honestly, I didn't love the '13 redesign when it came out, over the subtle and menacing '12 Candy Red Metallic styling I had at the time. Then I wrecked the '12 and my GF found this Sterling Grey Metallic '14 with all the bells and whistles my old car had, and the 6R auto I wanted. I took one look at the restyled car in that colour and fell out of love with my old car. Nothing since buying it has made me unhappy with it.
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post #6 of 16 (permalink) Old 03-23-2016
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Definitely heat extraction working for you. Plus I like the fact that I can remove the underhood blanket and the louvers when I hit the track.

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post #7 of 16 (permalink) Old 03-23-2016
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OP, Well they are actually called heat extractors. Thus main design intent is to extract heat. Heat in the engine compartment rises and is released out of the heat extractors.

2oo5GT, I did not realize that the under hood blanket/lining could be easily removed and reinstalled. Do you do that for weight reduction or heat relief? Road course or drag strip?

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post #8 of 16 (permalink) Old 03-23-2016
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Just for the track. If you remove all the push pins and only use a few not pushed in all the way, it's easy to remove. For weight, prob weighs almost near nothing.

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post #9 of 16 (permalink) Old 03-23-2016
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Quote:
Originally Posted by 5LHO View Post
Here's a theory base upon having had both a 2012 BBP and a 2014 BBP. The '12 had a nasty habit of having a little hood lift at high speed, making the front end light. The 2014 doesn't do that. I suspect the underhood pressure relief of the hood louvers may be the cause of this improvement.

The water drips right on the airbox lid, typically, obviously no harm done but, that's why panty-waists get all concerned with drips on their open element CAIs.
This^^^^^^^^

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The original reason for the vents on the 13-14 hoods was because the 13-14 engines didn't have the oil piston squirters, and the under-hood temps were 20-30 degrees higher. So the engineers popped in the vents.

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Not saying your lying but, where did that info come from? They redesigned the piston for 13, doing away with the need for the squirters but, it's hard to imagine they'd design a piston that ran hotter than the one they replaced. That would be asking for knock/preignition problems. 20-30 degrees in engine temp is huge. Modern engines are all regulated by the thermo and cooling system to a water temp of 220 max. You can't control piston temps with hood vents and the water temp is going to be fine as long as the rad is big enough and the fan has enough cfm.

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post #12 of 16 (permalink) Old 03-24-2016 Thread Starter
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WTF is a "piston squirter"?


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On the 11-12 cars there are little tubes which squirt oil underneathe the piston crown to carry heat away into the oil. They weren't needed after the 13 got a new design piston and were deleted.

2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85

2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP
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First saw the hood louvers on a 2010 Roush prototype. They had the louvers punched in the hood, not a separate panel and further back. Cost too much for production so they were dropped. MM & FF did a test on a 4 eye Stang and gained almost 20 hp with a heat extractor hood - dropped under hood temp that much to make a difference.
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I am not sure anybody really knows the actual cut off date for when the oil squirters were eliminated. I believe some 13's still have them. There is a very long forum discussion on this topic. The only way to confirm is by visual observation IMHO.

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