yeah i have a crack in my exhuast manifold.blah i hate cast iron but i just put some jb weld on there for temporary issues until i can afford to buy a new one. stainless steel this time.

i was just wondering how long i should let it sit and set in to the crack before i can boost it again. its only tuned to 6psi. 95 integra se thanks

 

wait, you really put jb weld on an exhaust manifold?

wow!

 

What's he supposed to do? JB won't hold, but neither would a weld. Cracked cast iron is a losing situation.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EnzoSpeed &raquo;</TD></TR><TR><TD CLASS="quote">What's he supposed to do? JB won't hold, but neither would a weld. Cracked cast iron is a losing situation.</TD></TR></TABLE>

whats are you talking about?

welding cast iron isnt as hard as everyone makes it to be. i welded my old hf mani with my mig welder and it held up just fine and never cracked again. i ended up selling the mani and it still hasnt cracked in a year the other guy has had it..


putting jb weld on an exhaust mani, yeah thats a great idea.

wonder if there is a Honda tech Dumbass of the year award, this sure would rank high up there.

post a picture of your jb welded manifold, i would love to see it!

 

do not put JB weld on it , have it tig welded with a high nickel rod , also drill a small hole at each end of the crack to stop it from spreading , and then heat up the manifold with a torch and get it nice and hot , and then weld it up and let it cool down on its owen , dont run it under water just leave it be , should fix it for you.

 

^^that's great advice.

http://jbweld.net/products/jbweld.php

read the bottom right corner in bolt italics.

"Not recommended for use on manifolds, exhaust systems, and other engine components which normally operate at temperatures above 500° F."

for that to be the only warning on that page suggests that it's a really dumb idea to use it on exhaust manifold.

 

Wow. Probably the only thing on a car that you CAN'T use JBWeld for is the exhaust.

But live and learn. There has to be a reason that companies need to put "do not eat" warnings on rat poison and "caution: Hot" on hot coffee.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C1CYA &raquo;</TD></TR><TR><TD CLASS="quote">do not put JB weld on it , have it tig welded with a high nickel rod , also drill a small hole at each end of the crack to stop it from spreading , and then heat up the manifold with a torch and get it nice and hot , and then weld it up and let it cool down on its owen , dont run it under water just leave it be , should fix it for you. </TD></TR></TABLE>

You can also slow down the cooling process by burying it in sand. I just welded up a volvo t3 turbo to use a standard t3 flange. After I got done preheating it and welding the half moons shut I placed it in a preheated oven, shut the heat off, closed the door (I threatened death upon anyone who opened it )and let it cool down overnight. Came out pretty sweet

sorry no pics. I already flattened it all out.

PS burying a fully assembled turbo in sand probably isn't a good idea I recommend the oven method.