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[duggs]

I normally hang on EVERY bit of advice on here and move ahead accordingly...BUT...I found a large old K&N cone filter the other day and plonked it inside the original air box, removing the panel filter of course and securing the K&N.

To me, inside the box, it doesn't make a jot of difference to the noise BUT I am 120% sure she runs alot better, seemingly smoother and certainly quicker off the mark...so its either the cone or "slight" mod I carried out to the air pipe in the front grill thats doing something. either that or the engine is about to blow up and this is her going out in style.

[zirk]

General opinion on here is that the Vx setup works fine, the biggest issue is your feeding Hot Air from the Engine Bay with a Cone Filter, unless you can feed cold air from the Front of the Car, as for noise well it can be the Umph feeling, its your choice, also don’t forget that most cone filters require oil to capture the small bits of crap in the air.

[tunnie]

With the standard setup are you using a geniune air filter? Mine was lumpy and stuttered but when I fitted a geniune filter things were much better

[Jimbob]

also...how dirty was the one you removed?

[TheBoy]

I normally hang on EVERY bit of advice on here and move ahead accordingly...BUT...I found a large old K&N cone filter the other day and plonked it inside the original air box, removing the panel filter of course and securing the K&N.

To me, inside the box, it doesn't make a jot of difference to the noise BUT I am 120% sure she runs alot better, seemingly smoother and certainly quicker off the mark...so its either the cone or "slight" mod I carried out to the air pipe in the front grill thats doing something. either that or the engine is about to blow up and this is her going out in style.

As has been implied, if your old air filter was passed its best, then any air fiilter will appear to be better.

The surface area of a genuine GM air filter (£9 + VAT on TC) is way larger than any 'performance' filter.

Pattern filters for the standard airbox are OK, but the genuine GM one is much, much better.


Air filters, much like other service item, don't leave it untiil Vauxhall's schedule to change, change it when it needs doing.  I tend to do mine anually

[Jimbob]

I normally hang on EVERY bit of advice on here and move ahead accordingly...BUT...I found a large old K&N cone filter the other day and plonked it inside the original air box, removing the panel filter of course and securing the K&N.

To me, inside the box, it doesn't make a jot of difference to the noise BUT I am 120% sure she runs alot better, seemingly smoother and certainly quicker off the mark...so its either the cone or "slight" mod I carried out to the air pipe in the front grill thats doing something. either that or the engine is about to blow up and this is her going out in style.

As has been implied, if your old air filter was passed its best, then any air fiilter will appear to be better.

The surface area of a genuine GM air filter (£9 + VAT on TC) is way larger than any 'performance' filter.

Pattern filters for the standard airbox are OK, but the genuine GM one is much, much better.


Air filters, much like other service item, don't leave it untiil Vauxhall's schedule to change, change it when it needs doing.  I tend to do mine anually

Yup, if you can tell the difference....you left it too long!

[TheBoy]

if you can tell the difference....you left it too long!

Exactly

[bigdods]

Air filters, much like other service item, don't leave it untiil Vauxhall's schedule to change, change it when it needs doing.  I tend to do mine anually

As its only £9 mine is replaced at every service so thats 3 times a year. Have to let the miggy breathe properly !

[TheBoy]

Air filters, much like other service item, don't leave it untiil Vauxhall's schedule to change, change it when it needs doing.  I tend to do mine anually

As its only £9 mine is replaced at every service so thats 3 times a year. Have to let the miggy breathe properly !

Yup, no harm in doing it more regular.  Currently, mileage on MV6 was around 6k per year, though that is going back up now I am tractorless 

[duggs]

Thanks for al your input..interesting read.
In fairness, the old filter did look a bit grubby.

Maybe I'm being a bit dim but one thing puzzles me.
Granted the original filter is bigger, spanning the whole box. Air shoots in filters then and down into the carb or whatever. Surely a cone, secured directly inside the airbox sucks the cool air from all around itself,
as it "rushes" in, providing better, more direct airflow.
Appreciate that they are generally pants if sitting outside in the engine bay but from inside the sealed airbox surely they work better.

[TheBoy]

Thanks for al your input..interesting read.
In fairness, the old filter did look a bit grubby.

Maybe I'm being a bit dim but one thing puzzles me.
Granted the original filter is bigger, spanning the whole box. Air shoots in filters then and down into the carb or whatever. Surely a cone, secured directly inside the airbox sucks the cool air from all around itself,
as it "rushes" in, providing better, more direct airflow.
Appreciate that they are generally pants if sitting outside in the engine bay but from inside the sealed airbox surely they work better.

In an airbox, I cone won't have space to 'breath'.

Added to that, the surface area is smaller than GM one. Less air MASS = less performance.

[duggs]

OOOOOOOOO ok !

Guess the increased performance must be down to the old GM one being old and grubby.

[NiallyV6CDX]

Not necessarily.
I know how everyone on here bangs on about how performance filters are smaller than the standard panel on the omega...some are some aren't.
I have a K&N filter cone, (not for an omega incidentally, but adapted to fit) which has a small inverted filter section inside the top of the cone too, the area of the filter is 525.4cm2. The standard panel filter has an area of 505cm2. Add to that that the paper used in the standard filter is more flow resistant than the cotton fibre in the K&N and the K&N (a big enough one at least) will definately allow more flow.
However, as has also been mentioned if you are then just sucking in a load of hot air, you will reduce, not increase the performance as the air will be less dense and therefore offer less oxygen.
So it is very important if you do change to a cone filter, you make sure that it is placed in a way that provides cold fresh air to it.
Also the oil used in the K&N has been know to damage the MAF sensors on the omega, so oiling sparingly is very important.
Its easy to work out the area of your cone filter versus the standard one. The standard one is approx 505cm2.

[duggs]

Well !  I don't know what size she is....but its quite a size.  It will only JUST fit inside the old airbox and is getting fresh cold air all the time.

When I say "inside" the airbox..its literally inside...totally enclosed and as mentioned with the lid back on...My V6 seems a lot happier, a sight deal quicker also.

[TheBoy]

Not necessarily.
I know how everyone on here bangs on about how performance filters are smaller than the standard panel on the omega...some are some aren't.
I have a K&N filter cone, (not for an omega incidentally, but adapted to fit) which has a small inverted filter section inside the top of the cone too, the area of the filter is 525.4cm2. The standard panel filter has an area of 505cm2. Add to that that the paper used in the standard filter is more flow resistant than the cotton fibre in the K&N and the K&N (a big enough one at least) will definately allow more flow.
However, as has also been mentioned if you are then just sucking in a load of hot air, you will reduce, not increase the performance as the air will be less dense and therefore offer less oxygen.
So it is very important if you do change to a cone filter, you make sure that it is placed in a way that provides cold fresh air to it.
Also the oil used in the K&N has been know to damage the MAF sensors on the omega, so oiling sparingly is very important.
Its easy to work out the area of your cone filter versus the standard one. The standard one is approx 505cm2.

Cone filters additionally need a fair amount of space around them to allow them to breathe best, which does mean you'll never really get the best from them in Omega (and still get a decent cold feed).

As to the standard size, where did that info come from?  The genuine GM one is approx 50%-70% larger than, for example, the Halfords pattern one.


To be honest, intake it not the restriction on the Omega, you need to work around the manifolds first, particularly on 2.5/3.0