One way to give a little bit more air to the Bmw E34 engine
is to change the air filter to a less restrictive one like
K&N or by removing the filter box and replacing it with
a cool air induction filter (more expensive).
Pros: If you have a sport exhaust, the sound will
be deeper. Maybe a little increase of acceleration. It is
the last time that you'll buy an air filter (if you clean
and oil it).
Cons: I must warn you that some people think that
the K&N type filters do not filter the air as good as
the stock filter and might harm your engine.
Cold air intakes non insulated are getting the warm air of
the engine. This will LOWER
Rob Levinson from UUC Motorwerks says that "it
is really doing every E34 owner a disservice for three reasons:
First, conclusive tests from independent labs show
that K&N filters, no matter how well-oiled and cleaned, let
through huge amounts of large particulate that damages engines.
Oil analysis shows 5x as much silicate contamination. Additionally,
the oil from these filters tends to muck up the MAF and cause
an engine-damaging lean-run condition.
Second, an open element filter like that sucks in hot
underhood air and subjects the filter to "fan wash", the swirl
that creates a vacuum effect. On the E36 M3, we measure a
15hp loss from open cone filters.
Third, the E34 airbox is designed with an integral
velocity-stack style venturi at the opening. Running one of
these engines on a dyno, you can cause a 5hp drop just from
putting your finger on the stack lip. Removing that airbox
undoes a lot of good BMW engineering. Yes, these filters make
a "really cool" noise... but noise
does not equal power. Stick with a stock paper
element in the factory airbox, you're not getting any more
power with a K&N garbage-filter, just damaging your motor."
Jim Conforti (AKA the Land Shark) did some testing:
This was a scientific test, not one done by filter manufacturer
X to show that their filters are better than manufacturer
Y. The test results are pretty irrefutable as the test lab
tests and designs filters where "screw ups" are absolutely
NOT allowable (I can't say any more for security. Think "Glow
in the Dark").
A scientific test was done on TEST filters where air was
loaded with ACCTD (some standardized "test dust" called AC
Coarse Test Dust) and sucked through the TEST filter then
through an analysis membrane. From the Quantity of dust injected
and the amount that gets through the TEST filter and is then
captured on the analysis membrane we can calculate the efficiency
of the TEST filter in Question.
BMW Stock Filter, Eff. Area of Media: 8.4 sq ft.
K&N Replacement, Eff. Area of Media: 1.6 sq ft.
The filters are the SAME size. They both fit in the
STOCK BMW M3 airbox. The difference is that the STOCK
filter has 65 pleats 1.5" deep and the K&N only 29
pleats each 0.75" deep.
Now, remember this ratio: " 5.25:1". It's
the ratio of the AREA of STOCK to K&N. It's very
important and will come into play later.
The STOCK filter efficiency started at 93.4% at 0 loading
and increased to 99.2% efficiency as the loading increased
to a max tested of 38.8 gm/sq ft of dust.
The K&N filter efficiency started at 85.2% at 0 loading
and increased to 98.1% at the max tested loading of 41.38
Now, I hear you. "Jim, that's only a FEW PERCENT".
But is it?
Let's look. If we had 100 grams of dust on a new BMW
filter we would let through a total of 6.6 grams of dust in.
If we used the new K&N filter we get 14.8 grams of dust.
That's 224% (TWO HUNDRED TWENTY FOUR PERCENT!!) more dust
ingested initially, stock vs. "free flow" and this
ratio is pretty much held. Somewhere between 200-300%
more dirt gets "ingested" anywhere across loading
equivalence. The more INTERESTING thing is when you look at
what happens to the DP or Differential Pressure at a constant
airflow as you dirty both filters equally with time.
The test used a rate of 75gr of dust per 20 min. Here's
where the AREA difference comes MAJORLY into play. See,
even though the BMW filter flows a bit less at the SAME loading,
it also LOADS UP 5.25 times SLOWER due to it's LARGER effective
area. So what happens is that the K&N initially
flows better, but as the dirt continues coming in, the K&N
eventually flows WORSE while still letting MORE dirt in.
Now, does any of this additional dirt cause problems?
I dunno. I suppose we could have a few people do some independent
oil analyses on different motors using both K&Ns and Stock
filters. Get enough of them, and you'd have a good statistical
basis. For me though, it's simple: More DIRT = BAD.
The additional short-term airflow might make sense on a track
car. IMHO, it doesn't for the street.
-- Jim Conforti
It is incorrect. The difference between 99.2% and 98.1% (his
results) is 1.1% not 224% as he states!!! (bmwE34.net:
who didn't go to school, Jim was measuring the amount of dust
that goes inside the engine). Furthermore, does
he realize that 96% meets OEM standards? K&N has been
around for over 30 years and we sell over 2,000,000 units
a year. If there were any sort of problem, one would think
we would know by now and so would everyone else. One Internet
"expert's" opinion is not reason for concern and
should be taken loosely at best.
That information is 100% untrue. Don't believe all you
read on the Net. Most is opinions not based on any sort of
factual evidence. Our filters are tested by an outside, independent
laboratory. They have been proven to stop at least 99% of
particles on a SAE dust test. This test uses particles as
low as the 0 - 5 micron range and goes up to 20 microns.
For comparison, a paper filter also stops 99% on the same
test and the OEM minimum standard is 96%. Foam is generally
the worst media with a typical efficiency rating of 75 - 85%.
To get higher ratings, the foam must be more dense and therefore
way more restrictive. The "tack" characteristic
of a K&N allows for increase filtration without loss of
flow as well. The testing procedure used is SAE J-726 using
ISO Test Dust.
This test is the standard of the air filter industry. The
test procedure consists of flowing air through the filter
at a constant rate (airflow rate is determined by the application)
while feeding test dust into the air stream at a rate of 1
gram per cubic meter of air.
As the filter loads with dust the pressure drop across the
filter is increased to maintain the prescribed airflow rate.
The test is continued until the pressure drop increases 10"
H2O above the initial restriction of the clean element (in
this case .78" to 10.78" H2O). At this point the
test is terminated. The dirty filter element is then weighed.
This weight is compared to the clean element weight to determine
the total Dust
Capacity. The amount of dust retained by the filter is divided
by the total amount of dust fed during the test to determine
the Cumulative Efficiency.
The K&N filter achieved the following results:
- Dust Capacity: 305grams
- K&N Cumulative Efficiency: 99.05 %
Holding the filter to the light is useless, pin holes are
That is what makes a K&N filter. There are actually hundreds
of microscopic fibers that cross these holes and when treated
with oil, capture and hold the very fine particles. On the
same hand, they allow the filter to flow more air than paper
or foam. The filter is 4 ply cotton gauze unlike some competitors
synthetic material filters. The synthetics do not
have the very small fibers that natural cotton does. Also,
the oil can be pulled off of a foam filter contaminating electronic
sensors. It will absorb into cotton and stay in the media.
In fact, Honda and Toyota only recommend K&N filters when
using aftermarket high flow filters as K&N is the only
brand of filter the oil does NOT come off of. They will not
cover a failed sensor if foam filters were used.
We got started over 30 years ago making filters for motorcycles
and off road racers. The filters did so well that these guys
wanted them for their cars and trucks. We started making filters
for these applications and here we are today. If they did
not work, we would not still be here and growing every year.
We now make filters for Chrysler/Mopar, Ford Motorsports,
Edelbrock, Rotax Engines, and Harley Davidson. We come as
original equipment on the 2000 Ford Mustang Cobra-R. We even
made filters for the Apache helicopters used in Desert Storm
because of maintenance problems with the original paper design.
If they work in these conditions they will work for you.
Rick from knfilters.com (Information emailed by Martin)
If you are looking for an increase
of power, this is not the right item, go to the sharked