Thermal blanket for engine

[hayden55]

I've removed my oem sound insulation from my hood, and threw on a sheet of standard craft paper backed r-13 over my engine from side to side. Makes a huge improvement in holding in heat. It would be on the prius when the engine would shut off the temp would go 1..2...3...4...5... essentially losing a degree a second (in 25-30F. Now with insulation it really doesn't lose it very fast.
It was pretty much impossible to stay in hybrid mode (above 150F) without. Now with upper and lower grill blocks, i can use a small amount of heat and get almost summer gas mileage in 45mph and down scenarios.

[Phase]

Originally Posted by twj347

Do you know what kind of aluminum bubble insulation you used, or what its temperature rating is? I looked into using this type of insulation before, but the stuff I found is only rated for temperatures up to 180 °F.

No idea. I don’t even think my hybrids engine bay can get that warm in cold months.