K&N filters

I had one on my Rangie 3.9 and took it off for 2 reasons
1 fine dust in the MAF after a trip to Yeranderie
2 Oil contamination of my MAF. 14CUX MAFs are almost unique in that they do not have a burn off cycle on shutdown.
3 I tested the restriction of the barrel aircleaner and snorkel by using a vacuum gauge, to decide on whether to disconnect the snorkel while on bitumin. The total restriction of cleaner , element and snorkel was only 12 inches of water at full throttle. I think the paper filter and canister only added about 5 inches of water. This is nothing. At cruise say 100Kmh there was positive pressure at the MAF, a tiny bit maybe 0.5 inch .
So for a V8 there is no real reason to change to a cone K&N other than noise which makes you think you are going faster.
The only advantage , if miniscule is at Max revs full throttle, a position you are rarely in with a V8, but of course in a diesel you are there most of the time while moving.
Regards Philip A

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Originally Posted by Kandy

:confused: mmmmmm, well thats been somewhat enlightening, some knowledgeable stuff on filtration in the links though some didnt "link".
I couldnt find the specs on paper filtration to compare to the K&Ns. On looking at the K&N you can actually see through it (just) as it is a lot thinner (less surface area) so must give better flow, well thats good but its the questions raised on actually stopping the finer particles. Only one person gave a personal experience of finding some fine dust in the air intake, others said theirs is clean with no MAF? issues. Well when I get the right one I will decide then, (use it or ebay it) as more info may be available.:eek:

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Try this link http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm
Regards Frank.

Thanks Frank but unable to get to that link--- I just get homepage of a communication company ? Im just about talked out of K&N -- sounds like there is a risk factor of entry of fine particles, who needs it.
Steve.

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Originally Posted by Kandy

Thanks Frank but unable to get to that link--- I just get homepage of a communication company ? Im just about talked out of K&N -- sounds like there is a risk factor of entry of fine particles, who needs it.
Steve.

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Steve, if you look at all the trucks on the road, many of which do millions of Klms you will not find a K&N filter, they are all Paper element filters, Why? because they keep the engine destroying dust out, Regards Frank.

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Originally Posted by tombraider

That must be the asthmatic V8 gasping for the air to keep up with all the petrol its guzzling :p

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its not my car that needs a "puffer"---:p

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Originally Posted by PhilipA

The only advantage , if miniscule is at Max revs full throttle, a position you are rarely in with a V8, but of course in a diesel you are there most of the time while moving.
Regards Philip A

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:D:p:p:p:p:D:D:D:p:p:p:p

Ahhh
the filter discussion rises again.
Heres a short story long.
A good shooting mate of mine Jim Keane, makes filters, Ausfil in Kogarah. mainly for mining machines, liquid and air. Really big ones.and small made to order ones too.
Some years ago when i had the pajero i bought a finer filter from a 4wd expo. Showed Jim he doesn't mince words, and told me in no uncertan terms to put it it the bin as it was a useless piece of junk, as the holes in the foam were too big to be effective and that oiling wouldn't make a great difference.
He then went on to describe how filter medium should work down to a certain micron level. He showed me some of the air filter medium he uses in his products that would trap particles as small as mite poo.fine dust too.
He recommended I stay with a good brand of paper filter and to change it regularly. We were going to make some for the pajero, but the cost was going to be high.
thats my play on filters.

john

I did see somewhere ( a site that explained the workings of a maf) that the use of foam filters was not good for the maf as it let too much air flow past it and it affected the way it measured whatever it measures :p and that the maf was designed for a certain amount of air flow or internal atmosphere and you could use more fuel by using a non standard type of filter.
But how much worse can fuel economy get on a Landrover petrol lets face it. I dont use mine much and here why. I did 200 k on the weekend towing my camping trailer on flat ground and it used 45 litres. My truck gets better milage and it carries 8500kg. My Landy is nice to drive but I might have to sell it and buy a diesel :(

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Originally Posted by JohnE

Ahhh
the filter discussion rises again.
Heres a short story long.
A good shooting mate of mine Jim Keane, makes filters, Ausfil in Kogarah. mainly for mining machines, liquid and air. Really big ones.and small made to order ones too.
Some years ago when i had the pajero i bought a finer filter from a 4wd expo. Showed Jim he doesn't mince words, and told me in no uncertan terms to put it it the bin as it was a useless piece of junk, as the holes in the foam were too big to be effective and that oiling wouldn't make a great difference.
He then went on to describe how filter medium should work down to a certain micron level. He showed me some of the air filter medium he uses in his products that would trap particles as small as mite poo.fine dust too.
He recommended I stay with a good brand of paper filter and to change it regularly. We were going to make some for the pajero, but the cost was going to be high.
thats my play on filters.

john

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I concur with all above;) ........just do some searches on here and also google some tests done on various filters [oil, air intake, pre filters, EFI and diesel and "small" paper air filters for carbied motors]......

......I'm trying to find some very good info/stuff [comparo tests] on this I've got.....will post it up as soon as I find it.

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Originally Posted by bellaposs

I did see somewhere ( a site that explained the workings of a maf) that the use of foam filters was not good for the maf as it let too much air flow past it and it affected the way it measured whatever it measures :p and that the maf was designed for a certain amount of air flow or internal atmosphere and you could use more fuel by using a non standard type of filter.
But how much worse can fuel economy get on a Landrover petrol lets face it. I dont use mine much and here why. I did 200 k on the weekend towing my camping trailer on flat ground and it used 45 litres. My truck gets better milage and it carries 8500kg. My Landy is nice to drive but I might have to sell it and buy a diesel :(

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Not too sure about some of that, but.......

basically problems with foam and oiled foam etc is that holes are too big! .....they let in too much rubbish.....MAF 's don't like being subjected to dirt! nor is it good for engines in general.......

Sure you can have "filters" with better/higher air flow rates than paper ones that "strangle your engine" (usual emotive descriptions used by foam/oil and other manufacturers) - but you also need better filtering medium than something that screens out pidgeons that got in the way of your vehicle's road!