Hi Mount Manifold.

[lcxu105]

Hi everyone. Looking at making a custom made manifold for my car as the turbo I have has inturnal gate and all off the shelf units won't allow me to use it. Turbo is a gtx3076r inturnal gated. Engine is in a lc torana so not enough room to run std hi mount manifold either. Is there any rules or information on making a manifold. Do the runners have to be certain length?

[lcxu105]

Well I have started to make the manifold. Can anyone tell me if I'm on the right path

[XRATED]

Hi Dave,

Before you go any further, have a look into merge collectors for a 6cy to t3/4 flanges.

Cheers

J.

[FJ RB25]

I too have the same problem with room and not being able to buy something off the shelf, I purchased a merge collector from someone who manufactures them for a living.

Thumbs up to making your own manifold to, something that not everyone can do.

Not sure if you have done this yet but I have been told that you need to rack the whole manifold together first so you can have all the runners in the right spot.

Let me know if you want the place where I got my merge collector from.

A fella here in Perth told me the standard exhaust manifold fitted in his Ranna RB25 swap.

Edited October 16, 2014 by FJ RB25

[lcxu105]

I have the std factory manifold atm. Want to use bigger turbo. So I have to make a custom manifold.

[Ben C34]

That's a tidy engine bay.

Where is the air cleaner - turbo inlet pipework?

[lcxu105]

Goes down beside the engine and has a pod filter. Gets cold air directly to it from brake duct at front.

[FJ RB25]

Very nice LC you have there

[lcxu105]

Thanks for that. It is in issue 203 of zoom mag if you want to have a read.

[lcxu105]

I'm making my own murge collecter. 1 will join into 2 then into 3 and the same in reverse for 6 5 and 4. Then 3 and 4 merge together in the collector just before the t3 flange. The waste gate will come off there.

[FJ RB25]

Ah cool, I think I stopped buying Zoom around the 200 mark, cheeky buggers were running exactly the same cars and stories in another mag.

I will have to hunt that issue down.

Looks like you know what you are doing by those welds, look forward to seeing the end product.

[lcxu105]

Thats only the root runs. Cap weld still to be done. I'm a boilermaker by trade. So it helps

[FJ RB25]

Yes the root welds, certainly does help being a boily doing your own fab stuff, I am a HD mechanic, I know how to weld but still to give Tig welding a go.

Lots of practice

[lcxu105]

No one has been able to answer my question. Is there any rules to follow with the length of the runners for the exhaust manifold

[hairdryer33]

I guess not, people still make power with log manifolds so just make one up see how it goes? Nothing to loose?

[lcxu105]

Looks like it. Just need to keep runners short to maintain heat.

[hairdryer33]

If you can put more pics up, im interested in this build

[lcxu105]

Will do when I get off my fat arse and do some more

[XRATED]

No one has been able to answer my question. Is there any rules to follow with the length of the runners for the exhaust manifold

No hard and fast rules about overall length or equal length... volume, heat and velocity.

I'd be looking at merge angles, turbulence and pressure loss.

What size flange are you intending to use?

[lcxu105]

T3. I have looked at how the pipe will meet each other and have tried to keep all joins away from bends to help flow