Heat soak - vented hood options that are not "louvered"

Chuck33079 · 11-10-2013, 10:04 PM

Quote:

Originally Posted by SouthArk370Z

It should be one of those "can't do any harm" deals. If the pressure at the base if the windshield is high enough it will block any flow out. If higher than that, it will force a little cold air in. Removing/installing the seal (at least on the battery side) is fairly easy, so it would be worth a try. If it doesn't work, put the seal back on.

Aren't the HVAC intakes at the bottom of the windshield? I'd be afraid of sucking all that hot air into the cabin.

It would be easy enough to test. My concern would be the air coming in at the back of the hood and slowing the air coming through the radiator. Somebody needs to go test it with some yarn and see which way the air goes.

SouthArk370Z · 11-10-2013, 10:12 PM

Quote:

Originally Posted by Chuck33079

It would be easy enough to test. My concern would be the air coming in at the back of the hood and slowing the air coming through the radiator. Somebody needs to go test it with some yarn and see which way the air goes.

If I weren't letting my engine cool down to check the IAT sensor, I'd make a quick run and check that. I'd like to see if it will allow hot air into the cabin. If nobody else has done it when I finish with the temp test, I'll see what I can do.

Chuck33079 · 11-10-2013, 10:14 PM

Quote:

Originally Posted by SouthArk370Z

If I weren't letting my engine cool down to check the IAT sensor, I'd make a quick run and check that. I'd like to see if it will allow hot air into the cabin. If nobody else has done it when I finish with the temp test, I'll see what I can do.

I'd love to know. My uneducated guess is that it'll act like a cowl induction hood on a muscle car and let air go in, but I'd love to be wrong. It would be really easy to add venting to that area if it turns out to be helpful.

SouthArk370Z · 11-10-2013, 10:26 PM

Quote:

Originally Posted by Chuck33079

I'd love to know. My uneducated guess is that it'll act like a cowl induction hood on a muscle car and let air go in, but I'd love to be wrong. It would be really easy to add venting to that area if it turns out to be helpful.

My guess is that, at speed, the pressure in the engine compartment from the air coming through the radiator will overcome the pressure at the rear of the hood. From what I understand, it's not that much higher than ambient, just higher than other places on the hood.

If air is going into the engine compartment, it will probably not be a lot as it will have to overcome the pressure in the engine compartment.

I'm curious to see what happens. Not that I will have any use for the info, but I find it interesting.

synolimit · 11-10-2013, 10:33 PM

Quote:

Originally Posted by Chuck33079

I'd love to know. My uneducated guess is that it'll act like a cowl induction hood on a muscle car and let air go in, but I'd love to be wrong. It would be really easy to add venting to that area if it turns out to be helpful.

I took all the covers out of my engine bay. The battery and brake master lid and their plastic they clip into but not the rubber seal that seals the hood to the plastic covering the lower windshield. You're talking about that long rubber seal and the plastic at the window right? I left it for concern about backdraft too. I don't think those covers do anything right? Even though they have seals on them as well to keep heat away from the battery or brake master I'd guess.

Rusty · 11-10-2013, 11:43 PM

We've had this discussion before. The base of the windshield is a high pressure area. Why do you think the '70's Trans Am's, chevy muscle cars, nascar, and a few others all use that area for air inlet into the motor. The best idea so far has been synolimit's. It's directly behind the radiator, at the front of the hood. Which is a low pressure area. All you would need is a cover for it that has the opening in the rear of it. Facing the windshield. About 1.5"~2" high. The air moving over it would help suck out the heat from under the hood. Another idea would be fender vents. Think of the '70's Trans Ams. I had 2 of them. The vents on them worked. Because they got their air directly from the engine compartment. Not from the inner fender liner, like some vented fenders do now.

dmhenderson · 11-11-2013, 06:55 AM

Quote:

Originally Posted by SouthArk370Z

If I weren't letting my engine cool down to check the IAT sensor, I'd make a quick run and check that. I'd like to see if it will allow hot air into the cabin. If nobody else has done it when I finish with the temp test, I'll see what I can do.

Very cool. Definitely keep us posted.

11-10-2013, 11:43 PM	#6 (permalink)
Rusty A True Z Fanatic Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 70 Posts: 35,575 Drives: 2011 Nismo GM 6M Rep Power: 2684440	We've had this discussion before. The base of the windshield is a high pressure area. Why do you think the '70's Trans Am's, chevy muscle cars, nascar, and a few others all use that area for air inlet into the motor. The best idea so far has been synolimit's. It's directly behind the radiator, at the front of the hood. Which is a low pressure area. All you would need is a cover for it that has the opening in the rear of it. Facing the windshield. About 1.5"~2" high. The air moving over it would help suck out the heat from under the hood. Another idea would be fender vents. Think of the '70's Trans Ams. I had 2 of them. The vents on them worked. Because they got their air directly from the engine compartment. Not from the inner fender liner, like some vented fenders do now. Chuck33079 likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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