F6A exhaust manifold. . .I think. . .

[Almost a Mini]

Probably a resonably long shot - but I'm looking for an exhaust manifold from a F6A turbo.
This is so that I can mount a VZ21 turbo to my DOHC turbo F5A engine (which uses a slightly different manifold).

This is the F5A manifold that I already have:


As far as I can work out, the F6A (and possibly F5B) manifolds are more or less the same, other than two of the manifold-to-turbo bolts are in different positions - as indicated by the red dots in the pic below:


Can anyone help me out?

[JohnnyB]

the manifold your describing sounds like a single cam one.



The front manifold is from a Single cam F6A turbo and it has square ports.

The rear one is off a DOHC F5A turbo and has round ports like the one you have pictured.

The DOHC manifold wont fit on the SOHC and vice versa, Sounds like you have a SOHC turbo to bolt onto the DOHC motor.

[Brayden]

Johnny is spot on the money.

[Almost a Mini]

Excellent. . .great information.

In that case, what does a DOHC F6A manifold look like, in terms of the orientation of the turbo-mounting bolts? The same as the DOHC F5A?

And further to that, do you know if FWD and RWD versions of the DOHC F6A's used the same exhaust manifolds? A new F6A Cappuccino exhaust manifold can be bought direct from Suzuki for around $250. . .

[JohnnyB]

In that case, what does a DOHC F6A manifold look like, in terms of the orientation of the turbo-mounting bolts? The same as the DOHC F5A?

The F6A DOHC turbo manifold should look identical to the F5A DOHC one. But no matter what you find you will be stuck with the turbo not fitting.

I think you should be looking for a turbo to suit the DOHC manifold not the other way around.

P.S Dump pipes are also different from the SOHC and DOHC motors

[Brayden]

Manifolds and dump pipes are also different between FWD and RWD models.

Just to add another variable, the F6A turbo is slightly larger than the F5A, and the mounting flanges are slightly different.

[Almost a Mini]

Just to add another variable, the F6A turbo is slightly larger than the F5A

Physically larger, or larger in an airflow/boost potential way?

I have both a VZ8 (DOHC F5A) and a couple of VZ21's (SOHC F6A(?)) and, apart from the exhaust housing mounting flange, they appear to be externally identical. . .

I wonder if the exhaust housing from the VZ8 could be fitted to the VZ21?

I guess the easy way to answer that, is to go out and pull them apart. . .

Thanks for your help, guys. . .I'm pretty sure this is the only place in the English speaking world where I could get this info. . .

[Brayden]

I have the turbo from an F6A and F5A, and I tried swapping the inlet housing over - turns out the impeller wheel on the F5A is a few mm smaller. So although the physical size of the turbo is the same (except the mounting flange) the trim of each turbo is slightly different.

Next time I remove the turbo from my ute I'll take measurements to demonstrate.

[blueprintute]

This threas has me worried that my turbo manifold wont fit now, it has square ports, has an IHI turbo on it, id on the turbo reads "RHB31".
I'll have to try to mount it up on the weekend to see of i have the right one, spewin if i dont!

[Brayden]

Depends on what motor you're trying to put it on!

[Almost a Mini]

Okie dokie. . .after pulling a couple of turbos apart. . .

This is a VZ8 (from a DOHC F5A) exhaust housing:
From the top:


And sitting flat on the dump pipe face:


And this is a VZ21 (from a SOHC F6A) exhaust housing:
From the top:


And sitting flat on the dump pipe face:


Interestingly, the VZ8 housing has a 32mm bore, and the VZ21 has a 28mm bore. . .

Now, does anone know the bore of a VZ24 (fitted to DOHC F6A's, I think)?

My reason for asking this is, that if the VZ24 exhaust housing has a 28mm bore, it would be an easy way of being able to mate up a VZ21 turbo core and a DOHC F5A. . .

[blueprintute]

Depends on what motor you're trying to put it on!

F5a

[Brayden]

DOHC or SOHC? The square port manifold will fit a SOHC but not DOHC.

[blueprintute]

DOHC or SOHC? The square port manifold will fit a SOHC but not DOHC.

SOHC. Cheers for that