Manifolds

Ben_EP82

Fresh Recruit
Hey guys ive been looking at manifolds over the last couple of days but dont no which 1 to go 4. what do u think of the silk road mani?
Cheers
Ben
 

riko666

Member +
They're good, but they crack as well...and with something as expensive as that, you'll regret it more. Try asking Ivan if he has anymore of his last batch of Mild Steel Manifolds
 

Ben_EP82

Fresh Recruit
i was told that mild steel manis crack and u can prevent the stainless from cracking if u heat rap it, please correct me if im wrong mate
 

riko666

Member +
They can still crack but far less likely to as Mild Steel is much less susceptible to big variations of expansion during a heat cycle than Stainless Steel. Mind you, most Stainless Steel manifolds are thicker in gauge than the equivalent Mild Steel ones whihc has something to do with it...

And heat wrap...that's fairly wrong, as in most cases, it'll help a manifold crack, not only by trapping moisture and bringing the onset of corrosion, but also by maintaining more heat within the manifold, for greater thermal expansion
 

Ben_EP82

Fresh Recruit
ok fair enough, very well explained! how much will i be looking at paying for a mild steel one mate? More than the stainless?
 

Timmy

Member +
Unlike most cars it is more expensive to make a mild steel because of the tight bends blah blah ect. Ivans used to go for around the £300 mark.
You can get a way with a silk road mani if you use trd engine mounts and a torque dampner and braced cat or decat.
 

sx_turbo

Lifer
@ timmy you can have all the engine bracing you like and the silk road mani will still crack, ask kuk-grant and a couple of others.

@ben-ep82 there is no mild steel mani left at the mo as every one has stopped making them. SPEEDVISION is a trader on the old site and shall be coming over to the new one shortly, and he has some mild steel ones in development, it should only be another couple of months till there available.
 

riko666

Member +
I will cry if JAM Stopped making them....where's their steel supply damnit, run and steal some from China
 

Ben_EP82

Fresh Recruit
So how unlikely is it for the mild steel to crack? If it did, is it as easy repairable as a stainless would b?
 

Franza1

Supermoderator & Area Reps Manager
There are many reasons why a Manifold cracks,

Main one is thermal shock or brittleness caused by rapid heating and cooling cycles, Theoretically speaking wrapping a manifold would make it less pron to cracking as it allows the manifold to cool slower therefore retaining the elastic properties of the steel, Moister can be solved by buying a paste that is painted on and seals the Wrap form moister,

corrosion isn't really a factor as it won't effect the manifold enough to cause failure without significant damage.

As for manifolds available, Sasha from WEPR has some new Evo Manifolds available but they require Modification of the turbo lines and a smaller radiator
 

riko666

Member +
lol.. tbh thats bull..
Not really, Mild Steel is physically easier to weld than Stainless steel...if I went to my materials lectures I could tell you why, I just know it's got to do with the smaller quantity of Carbon in Mild Steel
 
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