To heat shield or not to heat shield?

[LethalEagle]

That is the question......
I see so many photos with the heat shield not on the manifold. How do you keep from frying everything near it? Is there a heat shield for a t3/t4 manifold? Can someone help answer these questions?

Thank you,

Lee

 

[L2RTSiAWD]

No there is no heat shield for the T3/T4 manifold. You can just thermal wrap it. Rob(Black95GSX) has done this to his manifold.

 

[Black95GSX]

There's 2 things you can do for the T3/T4 manifolds... you can have it ceramic coated, if you get the right stuff, it will last for a very long time and not fall apart. Problem is, it costs $175-200 to get the 'good' stuff that works.


I spent $25 and got the "header wrap" fiberglass style wrap. WEAR GLOVES when you do it, thick leather gloves. Otherwise your hands will itch for a very long time.

It works great, I can actually "touch" the manifold after running the car for hours. Also lowers intake temps due to less heat in the engine compartment (keeps heat in manifold).


Here's a pic of my setup:
http://www.eclipsegsx.com/images/valve cover/MVC-076F.JPG
http://www.eclipsegsx.com/images/valve cover/MVC-070F.JPG

 

[LethalEagle]

I thought about the wrap, but some say it may overheat and crack the manifold. Plenty of racers use it, so I think I will try the wrap.

Thank you both for fast answers........ and good ones.

 

[Black95GSX]

The people that complain about the wrap overheating the manifold and cracking it, probably purchased "cheep" manifolds to begin with.
First and foremost, I'm useing this as a generalization... I realize some high quality manifolds may crack... and it has nothing to do with the building of the manifold... just "luck"


A lot of tubular manifolds that crack, crack because they are too thin. I feel confident wrapping my SFP manifold, because they used thick runners. So far, no problems with my SFP manifold, I've been extremely satisified with it.

 

[4g63dsm]

Does the rap change your EGT's If the rap hold in the heat then the EGT's would be higher right so is that a false reading?

 

[Black95GSX]

No, it does not change EGTs

 

[rick]

egt is taken directly from the eg, not on the surface of the exhaust, but a probe that goes into it like an 02 sensor. right?

 

[Black95GSX]

Correct, you measure EGTs from the CENTER of the exhaust runner, not the actual manifold surface.