Quote:
Originally Posted by ctgottapee
The issue is, and the reality is, that the insulating effect is darn near not scientifically measurable to any meaningful value.
The bubble foil has nearly zero insulating value on the underside of the hood when trying to keep heat in, and that is when you don't include all the other avenues of heat loss.
If you were to do accurate A-B-A testing you would see no difference.
There are other methods that do work, but they have limitations to:
-like The coolant heat retention method used by the prius; surely they would just line the hood for a $1 in bubble wrap if it actually worked.
-or frost heater type fittings plugged in to electrical source.
The engine is designed to shed heat fast; you can't alter that with a little cardboard.
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I will live in my delusional, non-scientific world and say that, simply by temperature of the hood a minute after driving, tells me that it is working. Even cardboard has an R-value. If the R-value of both the cardboard and the bubble foil comes out to about 1, that's still double the resistance compared to air. With how little space you have to work, it's hard to find any material that will insulate beyond that.