I'd be more worried about the pigeon walking around on the hot pipes.
I would agree with that. I had the passenger side header in my hands and was able to inspect it carefully and I saw no other evidence of any potential failure. The metal we cut around the hole, was intact. Also, I have not heard of anyone else with any problems with the headers.There is probably noting wrong with the material in the headers
:zwthstpd:There is probably noting wrong with the material in the headers, but all know that you should not put water on hot steel. It may crack. Thanks for the information about the drain of the AC.
Even the best steel will fatigue under the conditions described by GoldBird.Hmmm I wonder if they were made from CHEAP China steel
I bet it is a pain with the 4.6l in the way.....I tell you though, even with all the open room I have, it took me quite a few hours...err days to fit mine.Thanks for the heads up Mike. I'm sure no one wants to pull their headers...what a royal pain.
I guess I don't need to worry since I have no ac on my motor.
Right you are, I didn't even see that. Due to the angle that the camera was at, I'm not sure the firewall is 6-8 inches from the hole, but it sure appears to be forward of the hole. The camera was not pointed straight down, so the perspective is scewed.Judging by the first picture, I have to disagree with your diagnosis. That first pic shows both the hole in the primary tube as well as the A/C drain on the dash, and you can see that the hole is a good 4-6" forward of the firewall.
Assuming my theory is correct, and I'm not sure it is, it's the cooling process that stressed the metal, not the actual water hitting the metal. I'm thinking that when the water hit the tube, the coating lost heat to the water, the metal underneath lost heat to the coating, causing contraction, that would be the cooling process caused by evaporation. The coating may have slowed or mitigated the cooling somewhat, but ultimately if the water evaporates, the surface it hits will lose heat, and in turn, so will everything in contact with the surface losing heat. I mean, that's just the cooling process in general, material doesn't gain cool, it loses heat, and heat travels from hot material to cooler material. But that comes from someone with only an undergraduate degree in chemistry, I'm sure there's someone out there more qualified chemistry or physics or metallurgy than I that can explain or discredit the theory.jet-hot coating didnt help either?
I'm sure you're right, but I can't check it 'til it's back together. I knew the water hit the header somewhere. There are no other marks anywhere on the header, and with it in my hands, I couldn't really tell where the hole lined up in relation to the firewall....I'd also have to dis-agree, the drip normally lands on the spot where the tubes connect and even if it was reciving a daliy drip you would see the witness mark.
Now that explanation never occurred to me. There's no corresponding hole in the top of the hood, thoughLooks like a bullet hole to me.
... and you need to go back to skool school...BTW, Your welder needs to go back to welding skool!