Is this too warped to use?

[doradox]

Steve I'd agree if this was a structural part with your argument, however it is not. I think the main reason they make it in one piece is for production reasons. it is easier to make everything line up when welding when it is one piece sense they need to be in a line. The original part this replace isn't one piece and the mounts are designed to be that way. I'd be concerned about cutting it otherwise. Also the cuts would need to be in the correct spot otherwise you would be correct also and it would weaken the mount. In other-wards the part is structural over engineered

Yes, it is easier to line things up during welding and keep them aligned after welding because of the flange structure. Taking this header, designed and manufactured with a solid flange, and cutting it after the fact defeats the purpose of using the solid flange structure to maintain alignment. Cutting a part compromises it's structure. Is it compromised to the point of the entire assembly failing? Possibly not, but that's not the point. Can it still maintain port and bolt hole spacing? Who knows. It wasn't designed to do so after being cut up in the field. No engineer would even for a nano second wonder if his design would still perform if some joker took a hacksaw to it. Are other headers designed with separate flanges? Yes, and they were designed and processes specific to that design were used to maintain proper spacing after manufacture.

Steve

[doradox]

1)Because then i'd be wrong-and i'm not.

2)In your world,it's a fact.But here on earth-it isn't.

3)Catagorically false.As long as there is proper port alignment,whether the flange is solid or cut is completely 100% irrelevant.

4)On the contrary.

Your stuff is comedic gold.

1. Yes you are. (how do you like that for fact filled and compelling argument?)

2. You are right, the air, where once there was steel, between the cut flanges will help maintain their alignment. Everybody knows that. There is no chance that residual stresses in the tube will cause the now free end of the flange to move out of position. That's just crazy talk.

3. "as long as there is proper port alignment" ? You're right. As long as you get lucky and after cutting up this header the ports are still aligned then they are still aligned. Why didn't I think of that? See the part about the air helping to keep them aligned.

4. Oh no! The dreaded "on the contrary" argument. Well, I just have to say that one was well played. I just took an old multi-flange header and bent some of the tubes out of alignment and all the other headers in my shop suddenly became misaligned. I hope I didn't mess up everyone's headers. So I guess you are right. They do matter to this one specific header we are discussing! Who could have imagined such a thing?

Steve

[moonpup]

All this talk about compromising, and yet so little of it going on!

[LeonV]

Ztrain is a complete troll. Look him up by searching, he starts arguments about everything and stubbornly thrusts his wowing intellect at everyone. It's funny, I resisted to comment before his last post, but I was going to say that he's just going to come back and say how right he is. There's no stopping it!

Doradox, this is pure comedy! Oh look, here he comes again...

[grantf]

Who cares? Why did I read these stupid posts? Why am I writing this?

I am going to work on 280z bits now.:stupid::stupid::stupid:

[Inf]

...There is no chance that residual stresses in the tube will cause the now free end of the flange to move out of position. That's just crazy talk...

Correct.

These tubes are welded up on a jig, and when they're welded on, the pipes will be pre-strained towards the port on the flange they're welded to. There's probably not an economical way to manufacture it such that all the pre-strain will be removed.

Thought experiment:

Take a wire coathanger and bend it out into a straight wire. Next, bring the ends around and weld them together so the wire makes a circle. If you then cut the weld, that wire is going to straighten out somewhat, at least into a U or C shape, if not nearly straight. Same principle, just the strains will be a lot smaller since we're not talking about something that is so flexible....

[Z train]

Ztrain is a complete troll. Look him up by searching, he starts arguments about everything and stubbornly thrusts his wowing intellect at everyone. It's funny, I resisted to comment before his last post, but I was going to say that he's just going to come back and say how right he is. There's no stopping it!

Doradox, this is pure comedy! Oh look, here he comes again...

Leon-you're like a sundial at night

Correct.

Thought experiment:

Take a wire coathanger and bend it out into a straight wire. Next, bring the ends around and weld them together so the wire makes a circle. If you then cut the weld, that wire is going to straighten out somewhat, at least into a U or C shape, if not nearly straight. Same principle, just the strains will be a lot smaller since we're not talking about something that is so flexible....

Before you cut teh weld,put the hanger in a oven heated to 1300 degrees first.Then see what happens.

[doradox]

Before you cut teh weld,put the hanger in a oven heated to 1300 degrees first.Then see what happens.

Assuming you want to stress relieve and not harden (you did leave out the critical cooling phase definition and wire hanger is typically low carbon steel which doesn't harden well) why would you waste the time and money to do that? In other words, what's your point?

Steve