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Old 08-28-2016, 01:40 PM   #1
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Testing another hood vent

I always liked this Mustang vent and wondered if center was a better location than on the sides.

Like I have read before the improvement is hard to quantify, there was lots of hot air coming out once parked, TMP delta seemed to stay closer (<5 Deg F) and Turbo Tmp dropped faster. But lacking proper thermocouples its all biased by what I was hoping to find.

Vent SKU AR3Z*16C630*AA
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Old 08-28-2016, 01:55 PM   #2
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Nice work. Were you able to place the vent to avoid the hood support structure?

I think that should be a great location and maximize the transfer of heat coming off the turbo.


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Old 08-28-2016, 02:06 PM   #3
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Hey Nick, like the experimentation and was thinking about hood vents on my drive back from CCV.

I think it comes down to the pressure differentials while driving. The grill is going to be high pressure, as is the base of the windshield. The engine compartment is likely to be low pressure, is my current thinking. So, looking for "extraction" while driving is going to be difficult, if my thinking is sound (no guarantee on that!). The trick will be finding a lower pressure location above the hood vs under the hood. Seems like some streamers taped around and at the center of your vent would give you an idea of what is going on, is air getting sucked into or exiting out of the vent. Some (safely taken) pics would be great!

No question the heat will rise once parked, but traveling at 60, the vent may actually be reducing the airflow through the radiator if it is acting to equalize pressure behind the radiator by inducting air like cowl induction. (Take all this with a few grains of salt as it is strictly amateur logic!!). Interested in the conversation!!
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Old 08-28-2016, 02:41 PM   #4
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Here is a picture from the inside, unfortunately it doesn't fit behind the radiator but otherwise clearance it good.

I get the thinking on the pressure differential but with so tight space I have to think that any increased ventilation will help. "Perhaps" the design creates some lift and sucks hot air out, I don't know.

I also have the bottom of the bumper air scoop and saw a dramatic improvement with Trans Tmp after that and are running low deltas so if I can get the Engine to cool down faster once parked I'll be happy with that.

I may look into an engine compartment thermal sensor and test with the vent Open & Close, for now, will run for a few weeks before I decide to touch my original hood.
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Old 08-28-2016, 06:15 PM   #5
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Hey Nick, like the experimentation...Seems like some streamers taped around...pics would be great!
; ) What he said.
And of course we want to see the video.

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Old 08-28-2016, 06:22 PM   #6
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Quote:
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But lacking proper thermocouples its all biased by what I was hoping to find.
Looks good!

Dude.....I've got a a giant ziplock bag of thermocouples of a few form factors and a battery powered display for them......I can put them in Juli's car and you can walk across the street and get 'em.....


Quote:
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Seems like some streamers taped around and at the center of your vent would give you an idea of what is going on, is air getting sucked into or exiting out of the vent. Some (safely taken) pics would be great!
Great idea! 1" long yarn and scotch tape.....also stick some on/around the cowl and take some pics!...either you or nick...or both!
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Old 08-28-2016, 07:20 PM   #7
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The best write up by far I've seen on hood louvers. The particular application is a '97 Jeep but it's a well thought out approach.

Hood Vents :: Oman4x4.com


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Old 08-29-2016, 12:00 AM   #8
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Interesting read, I guess I'll be buying some Yarn and getting the GoPro in the next few weeks.
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Old 09-05-2016, 01:43 AM   #9
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Didn't somebody do this with sewing thread? I was just going to attach a temp probe to one of my vents and drive during a cool day to see what's happening, just never did it.
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Old 09-06-2016, 02:18 PM   #10
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I'm really interested to see the results of these tests. I like that hood-top vent, looks nice and seems like it would be the most effective place to draw heat out, especially off the turbo. In the winter, that heat coming thru the doghouse is ok; driving across Nebraska in the summer, not so much.
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