Interior Heat
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
On the other hand, if it's a heavily modded car, it'd work. I gave thought to the earlier comment on size, or overall length and I discussed, got confirming opinions and decided modify the grill design, by shortening it to two sections, instead of three to start. The 'less is more' thing, may just apply here.
A lot of really good info and great contributions on this.
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Maybe the fan idea is something to ponder too. For the ram air mod, with the ducts, have those powerful PC or Rack fans that run on 12v as well, so you'll have a dual source of cool air at a standstill too. We'll see how regular convection works too.
Racer
Joined: Jul 2013
Posts: 385
Likes: 3
From: Leesburg VA
The final solution will most likely be a combination of several strategies that will work together to finally resolve the heat issue some of us face.
I am excited by this effort, and feel F22 is making some solid progress that will help all of us that suffer with this problem.
John
Burning Brakes
Joined: Jul 2013
Posts: 1,139
Likes: 82
I think headers are a large source of the excess engine bay heat. For this and other well known issues, I'm not a huge fan of headers for street use. Those who say it kills performance should go for a ride in a well tuned big block car.
I'm currently restoring a 71 and debating whether to put "foil" type insulation on the inside or no. Insulation on the outside of the fiberglass shell would be fine but putting it on the inside of the car would "trap" heat between the glass and seems like it (the fiberglass)would break down over time.
The heat saga continues.
Kevin
I'm currently restoring a 71 and debating whether to put "foil" type insulation on the inside or no. Insulation on the outside of the fiberglass shell would be fine but putting it on the inside of the car would "trap" heat between the glass and seems like it (the fiberglass)would break down over time.
The heat saga continues.
Kevin
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
I think headers are a large source of the excess engine bay heat. For this and other well known issues, I'm not a huge fan of headers for street use. Those who say it kills performance should go for a ride in a well tuned big block car.
I'm currently restoring a 71 and debating whether to put "foil" type insulation on the inside or no. Insulation on the outside of the fiberglass shell would be fine but putting it on the inside of the car would "trap" heat between the glass and seems like it (the fiberglass)would break down over time.
The heat saga continues.
Kevin
I'm currently restoring a 71 and debating whether to put "foil" type insulation on the inside or no. Insulation on the outside of the fiberglass shell would be fine but putting it on the inside of the car would "trap" heat between the glass and seems like it (the fiberglass)would break down over time.
The heat saga continues.
Kevin
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Most of the interior heat is coming through the firewall after it becomes heat soaked...usually about 30 - 40 minutes into a drive. I think the hood venting will at least allow the heated air to mix with ambient air before entering the cabin vent system. This may open a new can of worms, but the primary source of cabin heating at this point seems to be the heat soak of the firewall. If that can be brought under control, then I feel the car will be much more comfortable.
The final solution will most likely be a combination of several strategies that will work together to finally resolve the heat issue some of us face.
I am excited by this effort, and feel F22 is making some solid progress that will help all of us that suffer with this problem.
John
The final solution will most likely be a combination of several strategies that will work together to finally resolve the heat issue some of us face.
I am excited by this effort, and feel F22 is making some solid progress that will help all of us that suffer with this problem.
John
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
I will be doing my exhaust in the next couple of months, from heads to exhaust tip, I am considering going to stock manifolds I just don't know how much "cooler" it will run than a good set of Doug's headers that are ceramic coated...
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Racer
Joined: Jul 2013
Posts: 385
Likes: 3
From: Leesburg VA
Go with the headers, believe me when I say that stock manifolds get the interior just as hot as headers do. I have side pipes as well, and the pipes get nowhere near as close to the firewall or floor as a under car exhaust system and my car is still a scorcher!
John
John
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
My exhaust, despite being new, is totally misrouted! Whoever installed it before I got it, missed routing it under the deep valleys under the car, with the factory heat shields, put it too close to the floorboards (and too high!), so take a real careful look and make sure they route it, like GM routed it and you'll avoid a lot of problems.
God, I'd love to get my hands on a thermal camera, because that would really, really help out. I couldn't really find any good pics to link to, for FLIR or Thermal Images, but from what I saw in my search, the engine is the hottest thing in the engine compartment, after all, it's producing the thermal energy that's going out the exhaust, is it not?
You've got a couple of months. I'm thinking, I'll be testing the grills out in less than a week, hopefully. And as mentioned, my design is being cut down in size, from a lengthy 36" with three cascading rectangles, to just two cascading rectangles, 24" in length.
Racer
Joined: Jul 2013
Posts: 385
Likes: 3
From: Leesburg VA
If you go to your local fire department, they may be able to take some thermal camera pictures for you. Most fire departments have one and most fire fighters seem to be car lovers, so they would probably be glad to help.
John
John
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
That's a great idea and I'll ask around. While IR Imaging has been around for awhile, it's still not cheap yet, but it's getting there. Another option would be to rent the equipment.
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
Thanks guys, I'll go with the headers then
Yeah I have a couple of months, waiting on my TKO 500 and supporting parts. I will also be spraying Lizard Skin heat barrier under the car (yeah I know some said to put it inside), I will be installing the tranny tunnel factory insulation along with horse collar and will probably use header wrap under the floor pan, from collector (to include collector), back.
Yeah I have a couple of months, waiting on my TKO 500 and supporting parts. I will also be spraying Lizard Skin heat barrier under the car (yeah I know some said to put it inside), I will be installing the tranny tunnel factory insulation along with horse collar and will probably use header wrap under the floor pan, from collector (to include collector), back.
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Update: Got the 1/8 insulation yesterday afternoon. It's a 30 foot roll and the stuff was so dense, I thought it was white cardboard at first! Like the back of a notepad it was, but just a touch more flexible. So I'm wondering, if it's really paper or not. I cut out a square and then got the bic lighter out of the tool box and tried to set it on fire.
Mmmm. Three seconds, five seconds, six seconds. That's good enough. I held it right above the flame and all it did was put some soot on it. So it's fiberglass. Today, dropped off the file at the sheet metal fab shop, so they can cut the hood grills. Hopefully, get it done by the weekend!
Also, having samples sent from BFG for their Silco Soft insulation. It comes in 1/4, 1/2 and 1 inch applications. It's German made, not cheap, but it's used for kilns, furnaces, nuclear power applications and such. It may be more cost-effective to go with a single layer of really superb matting, versus three or four of good stuff. We'll see. I'll test it out and figure out, some kind of BTU heat transfer test to see how long it takes to transfer heat from one side to another!
Mmmm. Three seconds, five seconds, six seconds. That's good enough. I held it right above the flame and all it did was put some soot on it. So it's fiberglass. Today, dropped off the file at the sheet metal fab shop, so they can cut the hood grills. Hopefully, get it done by the weekend!
Also, having samples sent from BFG for their Silco Soft insulation. It comes in 1/4, 1/2 and 1 inch applications. It's German made, not cheap, but it's used for kilns, furnaces, nuclear power applications and such. It may be more cost-effective to go with a single layer of really superb matting, versus three or four of good stuff. We'll see. I'll test it out and figure out, some kind of BTU heat transfer test to see how long it takes to transfer heat from one side to another!
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Why yes it does! A good IPA comes in right handy sometimes. Sipping a beer, staring at the task at hand, just allows a man to think in peace, for a few moments. It's no rare occasion, that some idea, will suddenly pop into your head, and for that, you are grateful.
Melting Slicks
Joined: Aug 2012
Posts: 3,487
Likes: 83
From: Titusville Florida
Was watching a show yesterday (car show of course), these two guys in the UK were building a Jaguar E-Type and the hood jumped right out at me, they put louvers on the hood I'm sure to evacuate under-hood heat.
http://en.wikipedia.org/wiki/File:19...E_Roadster.jpg
http://en.wikipedia.org/wiki/File:19...E_Roadster.jpg
Racer
Joined: Mar 2012
Posts: 250
Likes: 1
I'm loving all the ideas this thread has generated. It's really been an intriguing thread. F22, keep up all the effort. You're determination is awesome. I have one question though, with the vents on the hood, would water from driving in the rain be a concern?
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Update:
The Sheet Metal guy just called me and the Hood Grills are completed! He cut them on his huge CNC mill. I went with 0.09 Aluminum, to make it a little thicker and more substantial looking than 0.06. I will post pics tommorow, with them on the car (not mounted, just sitting on top of the hood, with a little bit of cushion hidden underneath to avoid damage to the paint).
I missed the response from Holden, and I apologize. Many of the hood grills from the aftermarket, come with a layer of sheet metal positioned an a 1/2 inch to 3/4 of an inch underneath the grill, to let heat out and keep the rain from coming in.
Because it sits on the outside of the engine on each side, I'm not sure how water would effect it. It could be an option, but I'm not ready to go down that road yet. First, I have to solve the problem of extracting the heat out of the engine compartment, then I can see if this experiment works.
Cutting holes in your hood is a scary thing, but I'm willing to take that chance, because I believe that something's gotta give! Hard to imagine, that there won't be some kind of immediate cooling effect, with 36" of venting, down both sides of the hood!
Pics tommorow!
The Sheet Metal guy just called me and the Hood Grills are completed! He cut them on his huge CNC mill. I went with 0.09 Aluminum, to make it a little thicker and more substantial looking than 0.06. I will post pics tommorow, with them on the car (not mounted, just sitting on top of the hood, with a little bit of cushion hidden underneath to avoid damage to the paint).
I missed the response from Holden, and I apologize. Many of the hood grills from the aftermarket, come with a layer of sheet metal positioned an a 1/2 inch to 3/4 of an inch underneath the grill, to let heat out and keep the rain from coming in.
Because it sits on the outside of the engine on each side, I'm not sure how water would effect it. It could be an option, but I'm not ready to go down that road yet. First, I have to solve the problem of extracting the heat out of the engine compartment, then I can see if this experiment works.
Cutting holes in your hood is a scary thing, but I'm willing to take that chance, because I believe that something's gotta give! Hard to imagine, that there won't be some kind of immediate cooling effect, with 36" of venting, down both sides of the hood!
Pics tommorow!
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
It might be because of my intimate relationship to designing them, etc, that I might be a wee prejudiced. I like the hood grills a lot. In the garage, they gleam right alongside the cowl hood and it looks good!
Pics tommorow...
Pics tommorow...