Homemade manifold idea
Turbo Mini Forums

Just looking for some help on my manifold idea working , picture shows a metro manifold with 2x flanges from lcb manifold one will be welded to metro manifold then other to t2 plate . With lcb manifold pieces welded Inbetween with a flexi for expansion. Will the size of pipe cause a flow issue from turbo to manifold . http://s46.photobucket.com/user/Sam413522/...a08bd8.jpg.html

Edited by sam138 on 8th Dec, 2014.

I dont think the pipe size will be your problem. Are you implying you are going to weld the steel pipe to the cast iron manifold? that wont work.

I wouldn't put a flexi pipe before the turbo. If it's springy steel with braiding over the top, I can imagine it overheating, loosing it's springy-ness and failing. Design a support that holds the weight of the turbo, but not so rigid that it stops the pipes expanding how they want to.

Edited by PhilR on 9th Dec, 2014.

You can get various flexi's or slip joints if you really needed one.

And welding to cast iron can be risky, but a flanged setup like you shod, cant really see a problem with it.

It's a little crude, but it would work ok. and no the small pipe size wont be a problem, but to try and merge or shape the end at the metro manifold so it has some degree of flow ability

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Don't forget the pressure pre-turbo is more than a flexi tube would be expected to see. If it doesn't give way, I have a vision of it stretching like a concertina when the turbo spools!

Weld a bigger flange onto the steel one, then bolt onto the cast manifold. It will be easier for you to change it at a later date, or if you want to remake the complete manifold from tube and sell the cast one.

Looks ok, but you might want to use better material than the LCB pipe.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Looks okay, as wil said I'd get it made up in stainless at an exhaust place, and make sure you create a support for the turbo, heat wrapping or coating the manifold extension/adapter would probably help too.