What inlet manifold?
Turbo Mini Forums

Hi,
I need to decide what inlet manifold I should get.
I think there are three options that I could uss in combination with an HIF44 carb and FusionFabs exh. manifold.

Op 1 MG Metro standard, op2 MG Metro turbo or op3 high flow manifold from Moss Europe.

Price wise the Moss manifold is atractive. But what manifold would you use from performance point of view?

Thanks
Ralf

The Vizard yellow book shows the MG Metro item having a good flow rate above others available.

Shane

wow, you mean the standard Metro one, not the turbo inlet?
Does it make sense to port the manifold a little?

Ralf

Yep, pretty sure from memory the Mg one flows a higher CMF than the turbo one , I'd have to dig out the book to double check.

Shane

I really wouldnt worry too much. Either will work fine.

Although the turbo one had thicker flanges I believe to better match the exhaust manifold flanges.
So if your exhaust manifold has thinner flanges and a normal intake clears it, it may suit better.

Or I'm sure I remember something along those lines.

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

I use the Std Metro one as nothing else would fit with my large bore Matty exhaust manifold.

'Where does the engine go?'

great infos, many thanks.

@Shane, I checked the CFM of MG Metro inlet in Vizard's book. Looks very good with 145. But couldn't find the CFM for the turbo one.

Flange thickness is a good point, my fusion fabs flange is about 9,8mm thick.
Is the MG Metro flange about 1mm thinner?


Ralf

Edited by Ralf on 22nd Nov, 2020.

I used to run a turbo inlet manifold with a Mirage manifold years ago the I had to thin the inlet flanges to match those of the Mirage exhaust. Im not sure the thickness of flange Matt uses on his though.

I’ve tested all the above manifolds on my flowbench, the details are on my FB page somewhere.
In terms of airflow the standard turbo one is awful. The MG one is good, but the best I’ve tested for a single HIF44 is the cast Maniflow one, though with a bit of work all can be improved upon.

Phil.

WWW.TURBO-MINI.COM

thanks Phil, I ordered the cast Maniflow.


Ralf

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

I found it a massive restriction. Fitted to one of my heads it limited airflow compared to when the head was tested on its own.
The manifold wasn’t just slightly turbulent either, it roared like a hurricane!
When flowing with the Maniflow the head flowed its full potential.

Phil.

Edited by Turbo Phil on 22nd Nov, 2020.

WWW.TURBO-MINI.COM

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