Originally Posted by propr'one
How does "wrapping" it fatigue the metal?
Not being a dick, i'm curious.
Basically what it comes down to is the metal cannot dissipate the heat towards the outside now... the wrap keeps it in, and that extra heat is what will cause the fatigue.
The proper way to keep underhood temps down is by ceramic coating the inside of the tubes. that way the heat doesn't get trapped and won't fatigue the metal.