K&N Filters
03-08-2003, 10:18 PM
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K&N Filters
My wrench believes they work great in most vehicles if you keep them oiled; however, if they dry out he has seen them let dirt through. He recommends checking them at every oil change and spraying LIGHTLY with K&N oil if they are dry.
The filter material turns white when it is really dry.
In my opinion he is the best wrench in town; however, we are both learning to work on 928s.
He has seen some soaked with oil. Some have also had motor oil or tranny fluid on them!
After installing a K&N on my 1999 4X4 3/4 ton Suburban my mileage improved 15%. I haven't had a problem with dirt getting by and I have used it for 12 months.
Due to the size of the filter and previous posts I plan to stick with an OEM filter in the 928.
The filter material turns white when it is really dry.
In my opinion he is the best wrench in town; however, we are both learning to work on 928s.
He has seen some soaked with oil. Some have also had motor oil or tranny fluid on them!
After installing a K&N on my 1999 4X4 3/4 ton Suburban my mileage improved 15%. I haven't had a problem with dirt getting by and I have used it for 12 months.
Due to the size of the filter and previous posts I plan to stick with an OEM filter in the 928.
03-09-2003, 12:21 AM
#6
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</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">Originally posted by Jim Bowers:
<strong><<...>>
After installing a K&N on my 1999 4X4 3/4 ton Suburban my mileage improved 15%. I haven't had a problem with dirt getting by and I have used it for 12 months.
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">The ONLY time that a different air filter will make a difference is when the filter is the limiting factor in the airflow to the engine. Most of the time the THROTTLE takes this honor. Unless you drive the car at or beyond the point where opening the throttle more makes no difference in engine output, you are fooling yourself about the effects of the filter.
Many/most folks usually do some maintenance at the same time that a new "miracle" filter is installed. Mileage increases, due to the new plugs, wires, cap & rotor, etc, and from the oil change that also happened at the same time. There's also a psychological influence that's attached to your right foot; do a blind test where the only thing that's changed is the filter and the driver doesn't know it. At least then you'll stand a chance of getting a more objective result.
My two sense. <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />
<strong><<...>>
After installing a K&N on my 1999 4X4 3/4 ton Suburban my mileage improved 15%. I haven't had a problem with dirt getting by and I have used it for 12 months.
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">The ONLY time that a different air filter will make a difference is when the filter is the limiting factor in the airflow to the engine. Most of the time the THROTTLE takes this honor. Unless you drive the car at or beyond the point where opening the throttle more makes no difference in engine output, you are fooling yourself about the effects of the filter.
Many/most folks usually do some maintenance at the same time that a new "miracle" filter is installed. Mileage increases, due to the new plugs, wires, cap & rotor, etc, and from the oil change that also happened at the same time. There's also a psychological influence that's attached to your right foot; do a blind test where the only thing that's changed is the filter and the driver doesn't know it. At least then you'll stand a chance of getting a more objective result.
My two sense. <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />
03-09-2003, 12:45 AM
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I was at the local Polaris dealer this week and the only filter they use in the racing ATVs is K&N and they service them after each day of racing. The chief wrench said it shaves a few tenths off of their times. He also stated they are not worth the cost and effort for the average ATV owner.
I also saw Polaris 0-50 synthetic oil ($6/qt.)that Polaris recommends for all of their ATVs and snowmobiles.Has anyone up North tried it in a car?
Both my light and heavy mechanic use K&N in their personal vehicles. They are a little bit of a pain to maintain, but the one in my Suburban is doing a fine job so far.
I also saw Polaris 0-50 synthetic oil ($6/qt.)that Polaris recommends for all of their ATVs and snowmobiles.Has anyone up North tried it in a car?
Both my light and heavy mechanic use K&N in their personal vehicles. They are a little bit of a pain to maintain, but the one in my Suburban is doing a fine job so far.
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03-09-2003, 01:26 AM
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Welll, I found dinosaur bones down in the inlet which clearly had passed through the K&N- and traces of diesel fuel on the hot wire due to the trasmorphigrization of the oil impregnated in the filter element.
Ran like hell though.
Ran like hell though.
03-09-2003, 07:23 AM
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Jim,
An individual here in our PacNW group did some experiments on the dyno with a K&N and new stock filter.
Turns out that the stock filter made more power than a K&N. A couple of brainpicking here in there, came to the conclusion that smoother incoming air produces more power than turbulent air.
A K&N makes a difference on most common cars applied, because they are usually equipped with small "price-efficient" filters. But it looks like the Porsche engineers were a step ahead.
Also, the oil on the K&N messes with the MAF in a bad way. That's why most 928 owners are switching back to their stock filters.
-Andrew
An individual here in our PacNW group did some experiments on the dyno with a K&N and new stock filter.
Turns out that the stock filter made more power than a K&N. A couple of brainpicking here in there, came to the conclusion that smoother incoming air produces more power than turbulent air.
A K&N makes a difference on most common cars applied, because they are usually equipped with small "price-efficient" filters. But it looks like the Porsche engineers were a step ahead.
Also, the oil on the K&N messes with the MAF in a bad way. That's why most 928 owners are switching back to their stock filters.
-Andrew
03-09-2003, 05:47 PM
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Hi Jim,
I have run a K&N in my S2 for 6 years/40k miles without any problems. The power differences are too small to bother about, I can't tell any difference.
Sometimes it is tricky to get the K&N filter to sit proerly in the filter box, that's when people claim large particles pass through them.
If you grossly over oil them when cleaning, then this can cause problems.
The MAF burn-off will cope with a slight amount of oil (there is quite often oil mist from the breathers in there) but it's not very happy if drenched with oil !
I have run a K&N in my S2 for 6 years/40k miles without any problems. The power differences are too small to bother about, I can't tell any difference.
Sometimes it is tricky to get the K&N filter to sit proerly in the filter box, that's when people claim large particles pass through them.
If you grossly over oil them when cleaning, then this can cause problems.
The MAF burn-off will cope with a slight amount of oil (there is quite often oil mist from the breathers in there) but it's not very happy if drenched with oil !
03-10-2003, 01:38 AM
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Filters have a peak performance that hapens AFTER the've been in use for a while.
The oil on a K&N doesn't stay there, and when it leaves the filter, it takes the crap it filtered with it, right into your engine.
Like all engineers, the Porsche boys do whatever they can to improve performance in any way. If K&N filters worked, and the trade-offs where acceptable, they'd use them.
Why go through all the super exotic stuff they do if a filter can give 15% or even 5% increase in any measurable aspect? - Ruf
The oil on a K&N doesn't stay there, and when it leaves the filter, it takes the crap it filtered with it, right into your engine.
Like all engineers, the Porsche boys do whatever they can to improve performance in any way. If K&N filters worked, and the trade-offs where acceptable, they'd use them.
Why go through all the super exotic stuff they do if a filter can give 15% or even 5% increase in any measurable aspect? - Ruf
03-10-2003, 11:26 AM
#14
Burning Brakes
I have a Ford truck that works HARD for me. It is a '99 with 210k miles on it. I have had a K&N in it since about 20k miles. I switched because the truck, a turbo diesel, was plugging the paper filters every 5,000 miles. Now I clean it every 20k or so.
It is pretty common knowledge that the K&Ns let through more dirt along with some extra airflow. Tests I have seen show that by the time the filtering capabilities are equal (K&N filters better as it gets dirty) the paper flows more air at an equal level of particle removal.
I do not run one in my 928 and will not. I also do not run one in my G-wagen because it goes into dusty off-road places. The paper just works better.
Amsoil does make an oiled foam filter which tests show to be the best of both worlds. I doubt that there is a 928 fittiment though.
It is pretty common knowledge that the K&Ns let through more dirt along with some extra airflow. Tests I have seen show that by the time the filtering capabilities are equal (K&N filters better as it gets dirty) the paper flows more air at an equal level of particle removal.
I do not run one in my 928 and will not. I also do not run one in my G-wagen because it goes into dusty off-road places. The paper just works better.
Amsoil does make an oiled foam filter which tests show to be the best of both worlds. I doubt that there is a 928 fittiment though.
