Any negative affects from oiled air filter installation?

[ukvolvo]

Hi Everyone Happy Sunday,

As the title states i am curious about anyone reporting issues as a result of installing panel filters?

Newer vehicles definitely suffer from issues as the oil gets onto sensors like the maf further down the system long term. Long time since i have ran injection and such fancies haha

Any experience appreciated

Mick

[griston64]

The general consensus on here is that 940 Turbo's perform best with the standard filter.

[ukvolvo]

Originally Posted by griston64

The general consensus on here is that 940 Turbo's perform best with the standard filter.

Really is this perhaps because of what im saying?

Do people modify the airboxes to increase intake? I have heard there is a sneaky cold air feed on the wing behind it.

[Laird Scooby]

Originally Posted by ukvolvo

Really is this perhaps because of what im saying?

Do people modify the airboxes to increase intake? I have heard there is a sneaky cold air feed on the wing behind it.

Oiled air filters aren't really the way to go unless you're planning on something like a K&N replacement panel filter.

https://www.ebay.co.uk/itm/392259052853

That may or may not be the right one for your car, there are two different sizes available, that one fits my 760 which i think uses the same size as 940T models.

The cold air feed is there to be used in conjunction with the hot air feed from the exhaust manifold and is designed to give a constant air intake temperature. However the wax-stat that operates the diverter valve in the air intake usually fails in the hot position so you end up drawing in very hot air. There is a thread somewhere about these with some instructions about renewing the wax-stat but they're not cheap, they're fiddly to change and will eventually fail again. If i remember the name of the thread i'll find it and post a link.
I do know that the hot air feed from the exhaust carries a lot of airborne dirt/oil from the engine bay, hot air is moister than cold air so transmits the dirt more easily. It was turning my air filter black within a few months so i removed the hot air feed from the exhaust as it was also causing flooding and overheating of the fuel rails and inlet manifold.

[JJD1]

This debate has been done to death on some of the biggest car forums in the world . Buy any Ferrari or porsche . Open the engine air filter box and see what inside. Chances are its a dry paper filter.

[ukvolvo]

Originally Posted by JJD1

This debate has been done to death on some of the biggest car forums in the world . Buy any Ferrari or porsche . Open the engine air filter box and see what inside. Chances are its a dry paper filter.

I chose my side of the debate a very long time ago. I am just purely interested in if they damage MAF'S on 940's. I generally run cars so old its irrelevant. I am purely interested in maximum airflow through the standard airbox without detriment to the engine or ancillaries.

Technically these uprated style filters do filter less than paper which is why they can flow a little more. I care not for what the sale speel has to say about it as they filter well enough for me regardless haha

[ukvolvo]

Originally Posted by Laird Scooby

Oiled air filters aren't really the way to go unless you're planning on something like a K&N replacement panel filter.

https://www.ebay.co.uk/itm/392259052853

That may or may not be the right one for your car, there are two different sizes available, that one fits my 760 which i think uses the same size as 940T models.

The cold air feed is there to be used in conjunction with the hot air feed from the exhaust manifold and is designed to give a constant air intake temperature. However the wax-stat that operates the diverter valve in the air intake usually fails in the hot position so you end up drawing in very hot air. There is a thread somewhere about these with some instructions about renewing the wax-stat but they're not cheap, they're fiddly to change and will eventually fail again. If i remember the name of the thread i'll find it and post a link.
I do know that the hot air feed from the exhaust carries a lot of airborne dirt/oil from the engine bay, hot air is moister than cold air so transmits the dirt more easily. It was turning my air filter black within a few months so i removed the hot air feed from the exhaust as it was also causing flooding and overheating of the fuel rails and inlet manifold.

Sounds like its best binned anyway and ohhh yes i was only interested in a panel filter. No big cheesy heat soaked filters lol