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Old 12-28-2019, 03:39 PM   #1
StreetRage320
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Are our hood vents functional?

I had a self proclaimed expert tell me my hood vents were just cosmetic and did nothing for actual heat dissipation. The roads were dry here in MN, so I took it out yesterday for a quick winter drive. I noticed heat rising out of them, so decided to take a quick pic with my FLIR gun and I think it's safe to say they are functional.

(my bow tie is a flow tie, so it that is why it looks like it's hot )
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Old 12-28-2019, 04:04 PM   #2
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I have a 2015, so my heat extractor is different than yours. I took mine for a wash and hand dry this morning (about 30 degrees here). You should have seen the amount of steam flowing out of my vent from the headers getting wet. Definitely not just cosmetic. Thanks for sharing the FLIR image, pretty cool.
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Old 12-28-2019, 04:28 PM   #3
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When the ZL1's first came out, there were some air flow pictures that showed the air flow coming into the front of the car and exiting the hood vents taking the heat from the engine with it.
very effective.
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Old 12-28-2019, 06:03 PM   #4
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Mine is not as functional as a real ZL1 Hood. I have The TL1 hood insert but i can tell you there is a lot of Heat coming out of those vents
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Old 12-28-2019, 06:53 PM   #5
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https://media.gm.com/media/us/en/che...-zl1/2014.html
Here is what gm says about the zl1 aerodynamic of the body and hood.
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Old 12-28-2019, 06:53 PM   #6
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Unless the “expert” was thinking of the mail slot, which is not functional. But, I doubt it.
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Old 12-30-2019, 12:54 PM   #7
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Quote:
Originally Posted by StreetRage320 View Post
I had a self proclaimed expert tell me my hood vents were just cosmetic and did nothing for actual heat dissipation. The roads were dry here in MN, so I took it out yesterday for a quick winter drive. I noticed heat rising out of them, so decided to take a quick pic with my FLIR gun and I think it's safe to say they are functional.

(my bow tie is a flow tie, so it that is why it looks like it's hot )
Nice heat imagery!!

I always see the heat waves hovering above my hood while I'm at a stop light on a cool day. I have also tested the aero of the grill and heat extractor after rinsing my car....

Place a leaf blower in front of the upper grill and watch the water/moisture shoot out of the heat extractor vents. Def functional as per GM's explanation.
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Old 12-30-2019, 01:24 PM   #8
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Quote:
Originally Posted by StreetRage320 View Post
I had a self proclaimed expert tell me my hood vents were just cosmetic and did nothing for actual heat dissipation. The roads were dry here in MN, so I took it out yesterday for a quick winter drive. I noticed heat rising out of them, so decided to take a quick pic with my FLIR gun and I think it's safe to say they are functional.

(my bow tie is a flow tie, so it that is why it looks like it's hot )
All you have to do is pop the hood on a ZL1 and see that the "mohawk" opens to the atmosphere. The guy that told you it wasn't functional is a bonafide goof.

Not only does it dissipate heat from the supercharger, but it also adds downforce at speed.
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Old 12-30-2019, 07:27 PM   #9
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yep, I knew there were functional, I didn't believe him at all. I just had never had it out in 20 degree weather to see the heat rising and it gave me reason to play with my FLIR E8, just figured I would share.
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Old 12-30-2019, 09:39 PM   #10
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Originally Posted by StreetRage320 View Post
yep, I knew there were functional, I didn't believe him at all. I just had never had it out in 20 degree weather to see the heat rising and it gave me reason to play with my FLIR E8, just figured I would share.
I always see the heat coming out when stopped at light or parked. Pretty cool!
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Old 12-31-2019, 03:55 PM   #11
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Cool view of the heat, thanks.


From the GM press release about the car:
  • Hood – The ZL1’s hood has a vented, carbon fibre insert, contributing to both engine cooling and aerodynamic downforce. The specially shaped vents draw air up through the engine bay – allowing a significant volume of air flow while keeping the front tires firmly connected to the pavement.
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