Header wraps

[tom jaffeux]

Who is wrapping their header? What are your results with the heat in the engine bay ?

 

[Don Frelier]

Works well for cutting the heat
Wrapping is pretty painful, but I was doing it when it was in the upper 80s.

 

[sam dupont]

I put a v8 into a car that overheated the open cockpit with the original 4 cylinder. The car came with no insulation and rubber mats on the floor. Wrapping the ram horn looking manifolds, I found water soaked header wrap lightly stretched went on nicely. Being an artist, I clamped with concrete tie wire. I got the idea from watching Insulators wrapping in oil refineries.

 

[gkent]

I works till the wrap is heat soaked - then it doesn't. If you think its an insulation, touch it and give us an update !!

 

[j-c-c-62]

Who is wrapping their header? What are your results with the heat in the engine bay ?

It is a rather short-sighted gain IMO.

Reason being and my experience:
"Thermal Fatigue
Thermal fatigue is a specific type of fatigue failure mechanism that is induced by cyclic stresses (thermal expansion and contraction) from repetitive fluctuations in the temperature (heating and cooling) of equipment. This type of fatigue is very important especially in power engineering, aeronautics and automotive engineering.

Thermal stresses arise in materials when they are heated or cooled. Thermal stresses effect the operation of facilities, both because of the large components subject to stress and because they are effected by the way in which the plant is operated. On cooling, residual tensile stresses are produced if the metal is prevented from moving (contracting) freely. Fatigue cracks can initiate and grow as cycling continues." What is Thermal Fatigue - Definition | Material Properties

Header Wrap increases the temperature of the underlying metal and that larger temp gradient as it cycles accelerates thermal fatigue.
Or everything has a price still holds true. Crumbling in your hand is the final price, only a matter of when.