Cardboard hood insulator

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Cardboard hood insulator

Postby chrisgerman1983 [OP] » December 18th 2012, 4:09pm

I made a hood insulator out of two layers of cardboard. I used high heat contact adhesive and sealed the cardboard with wipe on poly. I don't have any numbers yet to prove the decreased warmup time but my windows now defrost before the hood and I have usable heat from the heater core much faster then before. I will take some temp measurements with and without the insulator. It helps my intake temp as well. Well worth the ten minutes it took :mrgreen:
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Re: Cardboard hood insulator

Postby DRZ » December 18th 2012, 4:51pm

I unhook the snout from the air cleaner assy that is designed for getting the engine cooler air in the summer and also picks up water in the spring high water periods. Put it back on for summer so it can do its cool air thing. The cardboard thing never occurred to me before. My LT astro-mino has a felt type pad under the hood stock.
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Re: Cardboard hood insulator

Postby chrisgerman1983 [OP] » December 18th 2012, 8:24pm

Mine also has the felt but the extra insulation helps. I also run a warm air intake in the winter. I ran some flexible aluminum ducting down to the exhaust manifold. My intake temp is usually around 50 degrees once I'm warmed up. It goes into closed loop almost right away. I used to be in open loop untill I was almost at work.
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Re: Cardboard hood insulator

Postby smokinjoe » December 20th 2012, 5:11am

Isnt cardboard kina flammable? Just seems like it may be a concern.
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Re: Cardboard hood insulator

Postby chrisgerman1983 [OP] » December 20th 2012, 3:12pm

It was a slight concern at first, until I read that the ignition point of cardboard is 800f. much higher then the plastic and rubber that is under our hoods. It would take direct flame to ignite. Most people have paper air filters and the intake is the only place I have ever seen flame come from an engine... other then the exhaust at the races.
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Re: Cardboard hood insulator

Postby chrisgerman1983 [OP] » December 20th 2012, 3:29pm

I have the numbers with and without the cardboard :blah: this is with a grill block and partial belly pan. The hood insulator on its own would not likely have any benefit. Not sure if anybody cares but ill post em up anyway.

All times were within 20 minutes of the temps beside each other
The warmup time for the coolant was not affected but intake temps were higher with the cardboard, the cool down time was significantly different. for anybody who drives through out the day it would make the difference between having heat and closed loop immediately or waiting a couple minutes. For anybody who doesn't know the importance of open/closed loop, My fuel economy doubles as soon as it goes closed loop :mrgreen:

with C/B ----- Without C/B

Engine on ----- Engine on
07:55 - 41f ----- 41f
07:57 - 59f
07:59 - 106f
08:01 - 129f
08:02 - 145f
08:03 - 161f
08:05 - 187f ----- 187f
Engine off ----- Engine off
08:17 - 167f
08:31 - 156f ----- 146f
08:48 - 144f
09:12 - 129f ----- 108f
09:43 - 122f ----- 97f
10:19 - 122f ----- 71f
12:12 - 75f ------ 61f
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