In article <c7a6mi027jb (AT) news3 (DOT) newsguy.com>,
Nom <Nom (AT) Somewhere (DOT) Somewhere> wrote:
Well, they once did. 'Oil bath' filters were the norm at one time. Till
technology moved on and more efficient filtering became affordable.

That's the point. A K&N neither improves filtration or flow - unless you
compare it with a blocked paper one. And its filtration is considerably
poorer than a paper one within its service interval.

There's plenty of independent research to support this. K&N are fitted for
looks and or noise - not improved performance. Indeed, they can often
*reduce* performance - a prime example being the Rover V-8 injection as
fitted to the SD1 Vitesse, etc.

--
*I finally got my head together, now my body is falling apart.

Dave Plowman dave.sound (AT) argonet (DOT) co.uk London SW 12
RIP Acorn

The message <c7a7lg$1d7$1 (AT) titan (DOT) btinternet.com>
from "Martin \(Please note spammers email address used\)"
<avtoteplo (AT) altern (DOT) org> contains these words:

That's quite likely 'cos they're produced in such small numbers that
it's cheaper to buy in a filter than develop one in-house.

--
"Bother", said Skipweasel as he molished a little jig.

Some alternative inlet arrangements , including alternative air cleaners and
induction kits , as well as producing increased noise levels and potential
icing problems when cold , can produce significant power loss.
Cars that use by-pass type MAF sensors (e.g. many Fords , Nissans Jaguars
etc.) , reley on the air-flow through them being reasonably laminar to meter
correctly , indeed the engine's 'calibration' will take account of this. We
have measured , for example on a Mondeo 2 Litre , a drop of 8 BHP in the mid
range when a certain well known (and highly hyped up) make of air filter was
fitted in place of the paper original.
Mike

"Dave Plowman" <dave.sound (AT) argonet (DOT) co.uk> wrote


And they can often reduce power indirectly, because they can encourage poor
location. Example is the much-used fitting of two K&N cones to Rover V8s
with twin SUs. 99% time they're slid straight onto the intakes of the carbs,
which means they'll soak up all the underbonnet and engine heat, and they're
certainly not in the line of fire in terms of airflow. It seems very few
people consider keeping standard trunking in place, and fitting the K&Ns
ahead of this.

--
Ken Davidson
DocDelete


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.676 / Virus Database: 438 - Release Date: 03/05/04

In article <Hm7mc.373$NK4.8349 (AT) stones (DOT) force9.net>,
DocDelete <docdelete (AT) thehomeofnospam (DOT) org> wrote:
Of course not. They're fitted for looks and noise, not improvements in
performance.

--
*Never miss a good chance to shut up *

Dave Plowman dave.sound (AT) argonet (DOT) co.uk London SW 12
RIP Acorn

Dave Plowman wrote:
But it improves both - that's the whole point ! Most top-level motorsport
cars use the oil-coated-filter setup - they don't use paper filters.
Specifically, a BMC filter-equipped car won LeMans for about the last 5
years running !

But it's not !

Poppycock.

Huh ?
You can't see or hear your filter element ! I'm not talking about cones
here.

No, you're talking about cone filters. A completely different story.

Guy King wrote:
So they're obviously excellent then. If they weren't more than a match for a
paper element, then Aston would be using said paper element !

In article <c7cqv202ua7 (AT) news3 (DOT) newsguy.com>,
Nom <Nom (AT) Somewhere (DOT) Somewhere> wrote:
Are you saying that current Astons use them? Older ones used all sorts of
bought in rubbish...

--
*Why do they put Braille on the drive-through bank machines?

Dave Plowman dave.sound (AT) argonet (DOT) co.uk London SW 12
RIP Acorn

In article <c7cqsn02u89 (AT) news3 (DOT) newsguy.com>,
Nom <Nom (AT) Somewhere (DOT) Somewhere> wrote:
Err, a racing car will have its engine rebuilt regularly. Do you want this
on your road car?

Do a search on Jim Conforti for a start.

But with exactly the same claims from K&N and their supporters...

If the factory paper filter reduced power by increasing the airflow
resistance, simply removing it would give an instant increase in power.

--
*When companies ship Styrofoam, what do they pack it in? *

Dave Plowman dave.sound (AT) argonet (DOT) co.uk London SW 12
RIP Acorn

The message <c7cqv202ua7 (AT) news3 (DOT) newsguy.com>
from "Nom" <Nom (AT) Somewhere (DOT) Somewhere> contains these words:

Eh? It's more likely that they have a "sports" image which complements
the Aston brand and that they're easier to fit wheras a paper filter
would need a filter box designing and tuning and so on.

--
"Bother", said Skipweasel as he molished a little jig.