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Discussion Starter #1
Hi guys, just bought a pipercross freeflow replacement air filter for my V6, I'm supposed to oil (dirt retention additive!) the inside of the filter, should I stick my old MAF on for a few hundred miles to catch any oil, or just put a small (very) amount on, or even run it dry?
Any help gratefully recieved
Jason
 

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I think that if its supposed to be oiled then you have to use the oil as this is the part of the filtration system. You idea of using the old MAF is good and should alleviate any problem if the oil was to come off.

I thought most oiled filters come pre-oiled to ensure they dont get over oiled and cause problems.
 

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I think that if its supposed to be oiled then you have to use the oil as this is the part of the filtration system. You idea of using the old MAF is good and should alleviate any problem if the oil was to come off.

I thought most oiled filters come pre-oiled to ensure they dont get over oiled and cause problems.
Cheers, mine may be oiled already, but comes with a little spray tin as well..just assumed it was for me to oil it before fitting???
 

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I dont know the pipercross filters but my K&N came pre oiled (but no extra spray). It was inside a sealed bag which clearly had some oil on the inside showing the filter was already oiled...........
 

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and don't oil it from the inside !!! just sparsely from the outside ...
 

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Discussion Starter #6
and don't oil it from the inside !!! just sparsely from the outside ...
Instructions say to oil from inside?? But very sparsely
 

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Instructions say to oil from inside?? But very sparsely
well, I read the K&N instructions and it says ''oil from the outside''
but Piperflow may have a different construction, always follow the
factory instructions !! but imho when oiled from the inside the chance that the MAF gets dirty with oil is greater.
 

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I never recommend oiled filters, particularly K & Ns because of the migration problem in high under bonnet temperatures. As previously mentioned this will invariably cause a MAF sensor problem.

When cars with K & Ns are put on the rolling road, we always show the owner the power loss inflicted by this kind of filter as opposed to a good supplementary dry high tech free flow filter.

Oiled filters are fine if you are doing the Paris - Dakar and can change the filter every day or if crossing the Nullarbor Plain but other than that avoid like the plague.

I'm surprised that Pipercross have gone down this route - they never used to. Marketing pressures I suppose!
 

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Oiled filters are fine if you are doing the Paris - Dakar and can change the filter every day or if crossing the Nullarbor Plain but other than that avoid like the plague.

I'm surprised that Pipercross have gone down this route - they never used to. Marketing pressures I suppose!
As far as I can remember, Pipercross have always been oiled foam filters.
 

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David,

I stand corrected. Old age is creeping up on me. I was trying to remember the name of another producer of dry filters other than Jetex and thought that it must be Piper Cross. I was, in fact, thinking of RamAir***.

However high under bonnet temperatures will cause migration and as the oil heats up it will vaporise and become more sticky. Even if an engine was being tested under laboratory conditions where high temperatures were one of the parameters, the airflow would be gradually restricted causing a power loss.

I mention this having graduated as an automotive engineer from MIT in the '60s and then spent not an inconsiderable number of years specialising in fuel management systems. Latterly, in order to keep my hand in, I'm allowed to set up sidedraughts on BDAs and such like when I'm back at the workshops in Wales and here I set up carbs on Alfas, Lancias, WHYs (8 & 12 cyls) and Ducatis by invitation;) !


***And I remain standing waiting to be further corrected however, in my defence, I am talking particularities not generalities!
 

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Antmat, I listen to you carefully....
and I agree in general, but in my 156 the [email protected] sits in the standard
airfilter box and the intake is the V6 one, so the heating up problem
is not that big. I strongly reject the so-called open filters in the engine bay for obvious reasons. I fixed a couple of Alfa's with open filters and replaced the old filter house and a V6 intake, the owners were speachless about the difference, cars ran 100 % better.
And agreed , the standard 156 paper filter is OK, but I don't have to renew the [email protected] after 10.000 km, it is a pain in the *ss to renew an airfilter on a 156.
 

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Discussion Starter #12
Antmat, I listen to you carefully....
and I agree in general, but in my 156 the [email protected] sits in the standard
airfilter box and the intake is the V6 one, so the heating up problem
is not that big. I strongly reject the so-called open filters in the engine bay for obvious reasons. I fixed a couple of Alfa's with open filters and replaced the old filter house and a V6 intake, the owners were speachless about the difference, cars ran 100 % better.
And agreed , the standard 156 paper filter is OK, but I don't have to renew the [email protected] after 10.000 km, it is a pain in the *ss to renew an airfilter on a 156.
Well I see the points on both sides re oiled vs paper filters, I purposely have kept the airbox, because IMHO it is there to serve a purpose....Time will tell on my MAF though:eek:
It could be that plenty of the problems are from over oiling, or it could be that foam filters are NFG - One thing is for sure, I needed to change the filter anyway:p
 
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