86xxx
17th January 2008, 09:35 AM
<div class='quotetop'>QUOTE (70XIN @ Jan 17 2008, 01:57 AM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=470122)</div>
<div class='quotetop'>QUOTE (medwin46 @ Jan 15 2008, 01:22 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=469051)
<div class='quotetop'>QUOTE (70XIN @ Jan 15 2008, 01:56 PM) <{POST_SNAPBACK}> (index.php?act=findpost&pid=469036)
but the whole thing about cracking is just uneducated guessing, they are fine.
me, personally, will be using thick-as steam pipe[/b]
Its been proven time and time again, these (especially cheap ebay manifolds) stainless thin wall manifolds are just asking for trouble.
Stop and think about it for a second. You have a material that work hardens (as it heats and cools as manifolds do) that becomes brittle over a period of time. You have the weight of a turbo being supported out and away from the engine, which is a fair weight for even a steam pipe manifold to hold on its own. Being on ebay its even more so a cheap, ultra thin grade of stainless, more than likely the cheapest grade and not 304 as exhausts should be. The weight of the turbo, combined with the vibrations of the engine, added to the brittleness of the stainless, is just an uneducated wank factor purchase, and one that is garranteed to fail. It may take months or years, but it will crack, nothing is more certain.
If they are fine, why are you using steam pipe??!?
I made mine from steam pipe (thick wall black pipe), kept the runners as short as possible and as close to the bloack as possible, and have a solid support going down to the engine mount for support.... No breakage here.
[/b][/quote]
Because steam pipe was the only option at the time. I will continue to use it until it fails. I will probably even use it when i change to my trust turbo (different flange)
30psi4AGTE on toymods
Toysprinta on ae86dc
There are many others that haven't had a drama with 'ebay' manifolds in the slightest. Most these days are braced to help from cracking, honda, toyota, nissan manifolds to name a few. I know so many people (mainly non-toyota) that have had great success with ebay manifolds, that i'm happy to recommend them to anyone. If they aren't sufficiently braced (when they first 'came out'), you might have dramas, but it's a damn easy fix
Just because it's not your #1 choice medwin, doesn't mean it's crap. Please open your eyes, and leave your ego out of it.
Sorry if there are any stuff-ups. I'm on the turps, and its late, fun fun :)
[/b][/quote]
Lol There's no ego in my statement. Anyone who has any experience with fabrication knows what works and what doesnt. Fact is that stainless work hardens. When it is used in an application that is heating up to extreme temperatures and rapidly cooling, such as a manifold, this causes the metal to become brittle. When metal becomes brittle eventually it simply falls apart, crumbles. I have seen it personally, add the weight of a turbo sitting out on there and you're just asking for trouble.
FACT IS that thin walled stainless, even the best exhaust grade, will not last long under the extreme conditons that a turbo manifold is put under. Take into consideration the extreme heat of the manifold (and the fact that it is repeatedly heated to 800+ degrees and rapidly cooled, thus resulting in a brittle material), the vibrations from the engine shaking the beejesus out of it, with a 10kg mass hanging off the side of it acting as a lever. Anyone in their right mind can see that you are simply demading too much from this pipe, even if it is a hand made jobbie with top line materials and proper welding, lets not even think about the ebay manifolds thrown together in slanty eye land, non penetrating welds on shit material.
Just out of curiousity, how much experience have you had with metal fabrication and engineering?