What are these bags under the engine manifold?
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Join Date: Dec 2009
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The area where these bags sit gets very hot, what do you think? 200°F plus? If you were going to replace them, I imagine you'd have to get them from the dealer because that plastic can handle the high temps.
So the functionality is
Sound insulator
Heat spread away from the intake manifold
and keeps the hoses in place
Not bad!
So the functionality is
Sound insulator
Heat spread away from the intake manifold
and keeps the hoses in place
Not bad!
#13
On the other hand, in moderate temps (70-80F), they are probably effective at keeping the heat away from the manifold. In even lower temps, including snow conditions, they keep the heat from radiating away from the lower half of the engine, and this is good. A combustion engine loves heat, to a point.
So, I think it 'depends', but for most conditions, they do serve to keep useful heat at the engine block and slow its convection to the intake manifold. Therefor, the manifold may run a little bit cooler for it.
In extremely cold conditions, they are very useful. In moderate weather/temps, they serve well. However, in Scottsdale and Phoenix today where the outside temp was 118F, the heat insulator bags are not doing much. Hot is Hot.
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