Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: JamesV6CDX on 15 November 2009, 16:54:48

Title: 2.6 Exhaust Manifold on 2.5 engine
Post by: JamesV6CDX on 15 November 2009, 16:54:48

Hi Guys

I'm fitting 2.6 manifolds to my 2.5 as one of a few upgrades.

Am I right in thinking I need to use the 2.6 exhaust manifold gaskets, rather than  2.5 ones?

If so, anyone have the part number for said gaskets please?

The part  I have here is 24416110 - which I believe is the gasket for 2.5 and 3.0 and hence not suitable?

 :y

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: tunnie on 15 November 2009, 16:58:18

I wonder why the changed them, the heads are basically the same  :-/

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: JamesV6CDX on 15 November 2009, 17:24:00

I think it's to do with the SAI...

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: Marks DTM Calib on 15 November 2009, 17:26:12

Yes, you need the 2.6/3,2 gaskets....you also need to chop about 5mm off the lip at the top of the front pipe.

Not got a clue about the part number though.

They do flow better and are nicely made!

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: Andy H on 15 November 2009, 17:29:01

Quote

I think it's to do with the SAI...

Yes. I think the lighter manifolds absorb less heat to allow the pre cats to warm up quicker.

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: JamesV6CDX on 15 November 2009, 17:30:49

Quote

Yes, you need the 2.6/3,2 gaskets....you also need to chop about 5mm off the lip at the top of the front pipe.

Not got a clue about the part number though.

They do flow better and are nicely made!

Cheers Mark

Do you think the benefits will be noticable? Would it be beneficial to port the exhaust ports at all, or not?

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: Marks DTM Calib on 15 November 2009, 18:07:31

As per the engine basics, exhaust port porting makes little to no difference as the gases are not pumped.....and compared to the restriction of the bog standard manifolds.....

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: RobG on 15 November 2009, 20:21:05

EPC states these for 2.6/3.2  MANIFOLD,EXHAUST (FOR CYLINDER NOS. 1,3,5)     24422261   
18  MANIFOLD,EXHAUST (FOR CYLINDER NOS. 2,4,6) (NLS.)      24422262 

GASKET,EXHAUST MANIFOLD   
 12992739 

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: Martin_1962 on 15 November 2009, 22:21:40

Quote

Hi Guys

I'm fitting 2.6 manifolds to my 2.5 as one of a few upgrades.

Am I right in thinking I need to use the 2.6 exhaust manifold gaskets, rather than  2.5 ones?

If so, anyone have the part number for said gaskets please?

The part  I have here is 24416110 - which I believe is the gasket for 2.5 and 3.0 and hence not suitable?

 :y

I think I'd fit the whole lump

Title: Re: 2.6 Exhaust Manifold on 2.5 engine
Post by: Marks DTM Calib on 16 November 2009, 08:48:54

Quote

Quote

Hi Guys

I'm fitting 2.6 manifolds to my 2.5 as one of a few upgrades.

Am I right in thinking I need to use the 2.6 exhaust manifold gaskets, rather than  2.5 ones?

If so, anyone have the part number for said gaskets please?

The part  I have here is 24416110 - which I believe is the gasket for 2.5 and 3.0 and hence not suitable?

 :y

I think I'd fit the whole lump

I would not bother, no advantage unless you can get the compression back up.