What size pipe for manifold?

[koos]

As above, i'm gonna make my turbo manifold and wanted to know if anyone has an idea of what size pipe i should use? It's gonna be a log design, easier to make i reckon. Will make a plate for the head. Any help would be huge!!!!

[Turbo-Brown]

I made mine from 1 1/4" tube if I recall correctly (incidentally the same diameter as BMW used for the E36 M3 Evo engine manifolds by pure coincidence), but mine are 3into1 designs.

[WillG]

yep 1 1/4 (32mm) is the right size any bigger wont get nots on any smaller you restricting

[jmc330i]

1 1/4" for the primary pipes surely??

The 'log' section would need to be bigger wouldnt it?

[Turbo-Brown]

Yes, primaries only at 1 1/4" bigger after that if it's gonna be a log style manifold

[koos]

So 32mm(sorry metric only) for the ones coming off the head and the same size for the log? Is that correct?

[jmc330i]

Yeah 32mm for the primary pipes off the head.

The log would need be to bigger, but I would only be guessing as to what size it needs to be - it could also depend on the choice of turbo???

You could ask Ant what the size/dimensions of the BBR manifold are.

[martybee58]

If you need the flanges making for the head and the turbo I can laser cut them for you. I already have T3 flanges drawn so all i'd need is a exhaust manifold gasket and I can knock some out from mild steel up to 10mm thick. (as long as you are using a T3 that is.....)

PM me if you are interested.

Martin.

[e30_Turbo]

Martin,

You aint got a inlet mani flange on file do you?

I have a spare inlet manifold if you need to borrow it?

Thanks, Mark.

P.s. my primaries are 1 1/4 inch IIRC

[martybee58]

I dont Mark. But if you need one doing I can do it. I'll need the manifold though.