View Full Version : BMC Panel Filer
Anyone any experience of these, ie. How oily are they?
I ask this because of MAF problems with a K&N which I have had to clean and replace with OEM filter.( Yes, I take back everything I said in defence of the K&N in past threads ;) ! )
I might get a Green Panel Filter but BMC are supposed to be good, so just wondered.
Paul
both BMC and green are cotton gauze + oil. there is not a problem getting them fron the facotry it's when people clean them and spray too much oil onto them
It's exactly as vibrio is saying. You'll come into problems when becoming over zealous and over oiling it. I'd just stay away from the foam type filters (like ramair).
The only problem is that is what I heard and thought about the K&N until my factory oiled filter contaminated my MAF!
Paul
ibizacupra
02-09-2003, 11:10
Originally posted by psrob
The only problem is that is what I heard and thought about the K&N until my factory oiled filter contaminated my MAF!
Paul
Factory paper filter and MAF failures are unconnected...
MAF's fail... they're shite quality things.
Many things get blamed especially induction kits, and where it is true that over oiled and heavily coated filters can indeed track out onto the MAF element, that a lot of failures are just inherant in the iffy Bosch design.
Part of the engines breather system, introduces oil fumes back through the inlet tract, andf sometimes this can travel upstream towards the MAF.
Bill
Bill's right. I ran one in my old ibiza for over 200000km without a MAF failure.
My performance started going irratic sometimes. I had this on my old Cupra on which I also had a K&N. When I took the K&N out and took the MAF unit apart, the intake from the MAF onwards was coated in a slightly dirty, oily substance. I gave this all a good clean and was quite shocked just how much oil came back out on the rag. I took the MAF out the unit and gave that a good clean (not with the rag with isopropol 90%+ :D ).
I replaced the stock filter and ever since performance has been fine (touch wood!). I could really tell the difference after cleaning the MAF as well.
I think the oil level in the K&N varies maybe but I also reckon, especially with a panel filter being so close to the MAF and the large flat surface area of the panel filter, that a remapped turbo car with high boost can actually 'suck' the oil out of the filter. It can't help the problem anyway if they are overoiled. SAme could happen with any other engine which requires a lot of air. That's my theory anyway!
ibizacupra
03-09-2003, 08:06
Originally posted by psrob
My performance started going irratic sometimes. I had this on my old Cupra on which I also had a K&N. When I took the K&N out and took the MAF unit apart, the intake from the MAF onwards was coated in a slightly dirty, oily substance. I gave this all a good clean and was quite shocked just how much oil came back out on the rag. I took the MAF out the unit and gave that a good clean (not with the rag with isopropol 90%+ :D ).
I replaced the stock filter and ever since performance has been fine (touch wood!). I could really tell the difference after cleaning the MAF as well.
I think the oil level in the K&N varies maybe but I also reckon, especially with a panel filter being so close to the MAF and the large flat surface area of the panel filter, that a remapped turbo car with high boost can actually 'suck' the oil out of the filter. It can't help the problem anyway if they are overoiled. SAme could happen with any other engine which requires a lot of air. That's my theory anyway!
:) Well seeing as I practice what I preach.....(well sell :p) my own motor has been running Green filters for some 30K miles with zero evidence of oil track thru. Airflow thru my filters is VERY high compared to most. I keep checking my inlet tract for oil residue upstream of the MAF and still have yet to find any. downstream however, there is an oily coating (engine oil from crank case breather system, which is fed back into the inlet system)
I suspect most oil that actually coats the inlet is from the engine itself and not an induction kit. That said, over oiled induction kits will release the excess oil when airflow if driven thru them.... not seen this from the Green products I have been running personally tho. nearly 2 years on now. :)
regards
bill
I took my maf out again today and was supsrised that the protective grill from the unit was very slightly black with dirt and so was the intake pipe from maf onwards. This is with the oem filter and after having done about 2500 miles. I wiped it off and cleaned the maf again whilst it was out because some of this dirt must coat the maf itself I thought. I was suprised though with the stock paper filter letting it through and the air filter unit is well sealed. It was nowhere near as bad as with the K&N and there was only a very light oil film, which must be from the crank case breather like you say. To be honest, I did'nt really expect any dirt really.
The air box was full of dust. Mind you I suppose it is to be expected when I work by 2 cement making factories. I alway use really light throttle around there to avoid sucking it in. It's also a pain as your car always gets coated in a layer of dust every day, especially on calm dry days!
:)