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[feeutfo]

Ever wondered what is in the mid section silencer?

Double skinned. Two sections cut away in the top left corner of the pic prove that. With an internal cannister with perforated ends that feed into wire wool/wadding(most of which is missing) for silencing. Internal perforated pipe points the noise away from the exit pipe bottom right.


Most of the internals had rotten away and the wadding has gone, although some remained tucked in the corners.

Proves that once the general condition of the exhaust has deteriorated, it's not worth trying to patch up and repair. Bin it. Eternal mid sections fitted. 

[GastronomicKleptomaniac]

Horrid inefficiency in the name of noise reduction.

I might drive a two-ton car, but in my mind I'm an F1 engineer

Ta for sharing

[feeutfo]

Yeah, not exactly free flowing, I guess.

Although its said the exhaust manifold is the most restrictive.


...and I'm not sure how I managed to post this here. Ment go put it in car chat. Loosing it.

[05omegav6]

Nowt wrong with that Just change the cotton wool and you're good to go

Can you buy 2 1/4" scaffold pipe

Joking aside, what makes the manifold so restrictive?

[feeutfo]

Dunno. Although its a plenum chamber design rather than a single pipe per cylinder outlet. Presumably to do with engine tune for torque rather than outright top end bhp.

[GastronomicKleptomaniac]

Nowt wrong with that Just change the cotton wool and you're good to go

Can you buy 2 1/4" scaffold pipe

Joking aside, what makes the manifold so restrictive?

Packaging reasons, one would imagine - it's not the most efficient design compared to a 3-2-1 manifold. Cheaper too

[05omegav6]

Dunno. Although its a plenum chamber design rather than a single pipe per cylinder outlet. Presumably to do with engine tune for torque rather than outright top end bhp.

Nowt wrong with that Just change the cotton wool and you're good to go

Can you buy 2 1/4" scaffold pipe

Joking aside, what makes the manifold so restrictive?

Packaging reasons, one would imagine - it's not the most efficient design compared to a 3-2-1 manifold. Cheaper too

So a similar design could be used to ensure that the down pipes on a V8 didn't foul anything, with minimal impact on output, bearing in mind the 400+ bhp output

[feeutfo]

Here's the relevant area on Robs Monaro.

Not the clearest pic in the world, but shows the plug caps might be an issue for clearing the steering box as well.

[05omegav6]

Presmably the column must connect to the rack in more or less the same place as where the steering box lives 

Perhaps the solution would be to use the front end set up from the VZ platform with flaired front  wings

Any idea what the front track is on the Omega or the Holden chassis, the book of blox that I've got for the Commodore doesn't even list the kerb weights though looking at it, the steering column connects to the rack between the exhaust and the block. The question the is just how tight to the block could the exhaust  run

Top end clearance is probably ok if you resist fitting a supercharger

[Kevin Wood]

IIRC, 2Woody reported that the Holden subframes are an inch or two wider than the Omega. I would imagine the same is true of the track.

[feeutfo]

And the chassis. Which has been mentioned on here before.

I also noticed on the Catera forum, that the show pics of the v8 omega engine bay appear to show the engine off centre, away from the drivers side.


Although the only reference is a plastic engine cover.

[05omegav6]

And the chassis. Which has been mentioned on here before.

I also noticed on the Catera forum, that the show pics of the v8 omega engine bay appear to show the engine off centre, away from the drivers side.


Although the only reference is a plastic engine cover.

It may be that it is off centre to the right All Omegas have a similar engine bay layout regardless of drive side.
I reckon that we probably have an easier job than our lefthooker cousins. LHD have the steering box, ABS unit, power steering reservoir and a bloody great big brake servo all fighting to fit into the back left hand corner of the engine bay

[feeutfo]

Also the drivers side bank was rearmost on Robs monaro.

[05omegav6]

It'll be tight, that's for sure A bit of rearranging me thinks...

Holden: chassis rail-exhaust-steering column-block-exhaust-chassis rail.

Omega would have to be: chassis rail-steering box-exhaust-block-exhaust-steering idler-chassis rail.

Just need to route the exhaust will keep pondering, but you might not like the solution

[feeutfo]

Got a feeling the back box is blocked now. Full up with rust flakes probably.