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09-23-2012, 06:34 AM
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CC Member
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Join Date: Feb 2001
Location: BRADENTON,
FL
Cobra Make, Engine: KIRKHAM 427 S/C, SHELBY 427 ALUM. STROKER
Posts: 1,396
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Not Ranked
footwell insulation
have done all the searches, but need to know what material works best for insulating the footwells, floor and firewall against heat. Sound insulation would be superfelous (sp?) on these cars, so thats not a concern. I'm thinking stainless steel plates in the engine compartment, but what in the interior?
All suggestions appreciated.!
__________________
"When Injustice becomes Law,
Rebellion becomes Duty." T. Jefferson
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09-23-2012, 08:55 AM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,599
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Not Ranked
I have a padding with silver paper on one side and the padding on the other. I glued this shiny side out all around the engine compartment and footwells. It does not look the prettiest, but,hey, its pretty cool in the cabin!!
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09-23-2012, 09:10 AM
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CC Member
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Join Date: Jan 2009
Location: Oceanside BC Canada,
Posts: 41
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Not Ranked
I used a combination of Dynaliner, and two sided aluminum foil backed insulation. The 1/2" Dynaliner I used on the floors on top of the insulation, and under the carpet. The foot box front and sides, I just used the insulation material, and carpeted over it.. All seams were covered in DEI Heat tape.
In addition to this, I added an aluminum "stand-off plate" at the front of the foot box directly behind the headers. Small sections of aluminum tubing were used as spacers, and it was attached with machine screws and lock nuts.
I'm very happy with the results. Even on the hottest days of summer, my feet stay plenty cool.
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09-24-2012, 12:53 PM
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CC Member
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Join Date: Mar 2012
Location: Heath,
TX
Cobra Make, Engine: Shelby American CSX 8000 Slab Side series, 289 High Pro , Eight Stack EFI system ,TKO500
Posts: 275
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Not Ranked
Quote:
Originally Posted by MOTORHEAD
have done all the searches, but need to know what material works best for insulating the footwells, floor and firewall against heat. Sound insulation would be superfelous (sp?) on these cars, so thats not a concern. I'm thinking stainless steel plates in the engine compartment, but what in the interior?
All suggestions appreciated.!
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This works well for me. George
KoolMat Hi-Tech Heat Insulation
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09-24-2012, 01:35 PM
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CC Member
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Join Date: Apr 2008
Location: Melbourne,
Vic
Cobra Make, Engine: Some polish thing... With some old engine
Posts: 2,286
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Not Ranked
The best way to deflect heat is gold foil.
As used on the mclarens and kirkham billet car.
The stuff ain't cheap, but...
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09-24-2012, 02:02 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,977
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Not Ranked
The best way is to stop the heat soak to begin with on the outside of the foot boxes.
Silcone sheets on the outside between the heat shield and footbox works wonders. Then you sound insulate and pad the interior as usual.
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Remember, It's never too early to start beefing up your obituary.
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09-24-2012, 04:53 PM
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CC Member
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Join Date: Apr 2006
Location: Los Angeles,
ca
Cobra Make, Engine: Hurricane Motorsports, 427w
Posts: 439
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Not Ranked
Here's the stuff I used:
http://http://www.lowes.com/pd_28929...ductId=1081449
It's FrostKing insulation. Foil on one side and adhesive on the other. It's the stuff recommended in the ERA build manual and it worked great. Maybe it's belt and suspenders, but I also used jute pad between this stuff and my carpet. Nice and quite (except for the sidepipe noise you want to hear) and no heat issues coming into the cockpit.
Matt
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Hurricane Motorsports #1053; 427w
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09-24-2012, 07:59 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,395
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The Stainless Steel plates that stand-off the fiberglass footwells are quite good by themselves. The air gap between the SS plate and the fiberglass is quite a good insulator since air is flowing thru this area when the car is moving. The plates should be Stainless Steel and not aluminum and polishing them increases their effectiveness.
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Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, & Cinema Tribute Cars.
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
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09-24-2012, 08:07 PM
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CC Member
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Join Date: Feb 2001
Location: BRADENTON,
FL
Cobra Make, Engine: KIRKHAM 427 S/C, SHELBY 427 ALUM. STROKER
Posts: 1,396
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Not Ranked
Thanks guys for all the leads & suggestions, that'll give me plenty of options !
__________________
"When Injustice becomes Law,
Rebellion becomes Duty." T. Jefferson
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09-25-2012, 04:14 AM
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CC Member
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Join Date: Jul 2004
Cobra Make, Engine: 347 Stroker Morrison Injection. Registered.
Posts: 1,440
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Not Ranked
__________________
Mando
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09-25-2012, 05:11 AM
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CC Member
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Join Date: Dec 2010
Location: Allen,
TX
Cobra Make, Engine: Werk77 289FIA
Posts: 1,295
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Quote:
Originally Posted by Blas
The plates should be Stainless Steel and not aluminum and polishing them increases their effectiveness.
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Not really- stainless steel is heavier, harder to work with and cost more. Polish them makes no difference because you handle heat radiation and not light radiation.
The aluminum cool down easier and they don't need to be very thick. All what a heat shield does is keep the heat directly from the surface.
With an 0.5 inch gap and a 18ga alu shield we talking about 250f (1 inch from the header) before and ambient temp after 0.5 inches.
What helps the most is to wrap the headers (150f one inch from header), in combination with the heat shields. That helps to lower the overall engine department temp.
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Scratch build 289 FIA see the Scratch builder forum on CC - sold
DRB GT40 MK1 red #49- sold
FF5 Mk4 #7733 302/T5/IRS - dark blue - sold
FF5 MK4 #7812 427/TKO/IRS - Guardsman Blue - sold
FF5 MK4 #8414 501/TKO600/48IDA Ollie the Dragon #91 - sold
FF5 Daytona Coupe 347/TKO/IRS Homage CSX2299 Viking Blue - sold
SPF 2063
Last edited by G-Pete; 09-25-2012 at 05:13 AM..
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09-25-2012, 10:37 AM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,395
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Conductive Heat Transfer through Aluminum with thickness 2 mm and temperature difference 200 C (382 F)
q / A = 250 (W/mK) 200 (C) / 2 10-3 (m) = 25000 (kW/m2)
Conductive Heat Transfer through Stainless Steel with thickness 2 mm and temperature difference 200 C (382 F)
q / A = 16 (W/mK) 200 (C) / 2 10-3 (m) = 1600 (kW/m2)
The emissivity coefficient - ε - indicates the radiation of heat from a 'grey body' according the Stefan-Boltzmann Law,
compared with the radiation of heat from a ideal 'black body' with the emissivity coefficient ε = 1.
Stainless Steel, weathered emissivity coefficient = 0.85
Stainless Steel, polished emissivity coefficient = 0.075
Way to technical for me, and while I have not personally confirmed the above technical information , I did stay at a Holiday Inn last night........
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, & Cinema Tribute Cars.
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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09-25-2012, 12:06 PM
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CC Member
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Join Date: Dec 2010
Location: Allen,
TX
Cobra Make, Engine: Werk77 289FIA
Posts: 1,295
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It is just amazing how the internet creates all kinds of engineers.
One click and you have the right answers and formulas...
WRONG!
I like to visit my last statement:
"The aluminum cool down easier and they don't need to be very thick. All what a heat shield does is keep the heat directly from the surface."
Ergo, alu heats up faster and the heat conductivity is higher. With other words, if there is any little airflow striking the alu the radiation will be lower, because of the rapid change of molecules (principle of heat sink).
Both shields will heat up to the same temperature inside the engine compartment eventually (no airflow) - the alu just a little faster, but is cooled down and radiates less on the other side when exposed to airflow.
As soon the fan kicks, in you have airflow.
As I said before, there is no gain (SS) with higher cost, more weight and harder handling.
Google tip: https://www.google.com/search?q=automotive+heat+shields&hl=en&client=fire fox-a&hs=sbb&rls=org.mozilla:en-USfficial&prmd=imvns&source=lnms&tbm=isch&sa=X&e i=0P5hUM2EIoje9ASNkIDACA&ved=0CAoQ_AUoAQ&biw=1785& bih=913
__________________
Scratch build 289 FIA see the Scratch builder forum on CC - sold
DRB GT40 MK1 red #49- sold
FF5 Mk4 #7733 302/T5/IRS - dark blue - sold
FF5 MK4 #7812 427/TKO/IRS - Guardsman Blue - sold
FF5 MK4 #8414 501/TKO600/48IDA Ollie the Dragon #91 - sold
FF5 Daytona Coupe 347/TKO/IRS Homage CSX2299 Viking Blue - sold
SPF 2063
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09-25-2012, 01:08 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,395
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I think the issue here is how you and I perceive the function of the heat shield as used in this case.
You stated: …’ alu heats up faster and the heat conductivity is higher…” And I totally agree with that statement, but then wouldn’t all that additional heat that is transferred so much more efficiently thru the aluminum plate once again be interacting with the footwalls’ fiberglass and ultimately with your feet? Especially during periods of low air flow behind the heat shield plate. I don’t think the idea here is to create a heatsink here with aluminum, the goal is to reflect or slow down the efficient transfer of heat from the headers to the footwell fiberglass And using a material that does not conduct heat as easily thru itself, like stainless steel, prevents the efficient transfer of heat back to the fiberglass on the footwell. We are not trying to extract heat from the headers or area around them and actually attempting to “cool” it.
And you were also correct in saying the stainless steel is a higher cost, has more weight and harder handling then aluminum, but these facts are not relevant to the question of heat transfer are they.
And regarding your opening statement… --------------------------!
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, & Cinema Tribute Cars.
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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09-26-2012, 05:47 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,555
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They may not even make this now but I used Thermotech on my Cobra. Easy to cut, bends as easily as a blanket and it will withstand up to 1500 degrees. I even had my transmission tunnel lined with it and worked great. It came in a roll and you just unroll it and either glue it in or use screws. I think it was about 1/4 inch thick with the shinny side out. I even replaced some of my aluminum heat reflectors with it as it lowered the temperature behind the shield more than the aluminum did.
Ron
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09-29-2012, 09:52 AM
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CC Member
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Join Date: Jan 2009
Location: Oceanside BC Canada,
Posts: 41
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I expect there is always some airflow within the air space, when using a foot box deflector plate, (regardless of material used), via convection, caused by the heat itself..Hot air rises, drawing in the cooler air from the bottom. This takes place regardless if your moving, or if your cooling fan is running. Granted, it might not be as rapid an air movement, but the hot air is not trapped.
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