Stock filter in, K&N out

Just switched back to the stock filter and noticed an immediate improvement in acceleration and the surging idle is gone...go figure! I'm sticking with stock....just my 2centsworth.

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Shakenbake (Chris Baker)
1974 911 Coupe
'91 "A" stock champion WV
'90 SCCA FTD
'99 SCCA 3x "A" stock winner

The difference was that dramatic. After reading all of those past posts I decided to do the same. I should have my stock filter in tomorrow. Maybe that will help cure my 50-60 rpm idle surges too....TargaEuro

Chris,

I am not sure what was happening with your CIS system, but almost the same symptoms on a 3.2 Carrera were reported and cured the same way about a year ago! Those paper filters must have a precise amount of pressure differential across them that the fuel injection 'EXPECTS TO OCCUR!

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Warren Hall
1973 911S Targa

K&N must have the world's greatest marketing. Why do so many people buy these things?

There filters are nothing more than hype for every auto they make them for.

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1988 black on black Coupe

Not only do people buy them, but they pay up to $400 (!!!!!!) for a filter on the end of a fancy PVC pipe! Unbelievable!

Hey guys, I am selling my K&N filter, I swear mine actually works, I just decided that I didn't need all that horsepower.
--I give you special price 299.99!

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___________________
Dante Oliverio
86 Turbo-Look Cab

K&N - for Kooks and Nuts

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1988 black on black Coupe

For sale, 1 K&N air filter for Porsche 911, 1974-1979 models. Guaranteed to increase horsepower by 50%. Comes complete with rejuvenation juice and cleaner to keep your engine wondering what the heck is going on. Have original boxes, make offer.

Chris

Were there ever any tests conducted to determine the amount of airflow a cis engine needed? I understand that on later cars an improvement to throttle response and performance was achieved by modifications to the airbox. This does not seem to hold true to the cis engines. I think that the increased airflow caused by the K&N filter element actually caused more issues with low end performance.


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Shakenbake (Chris Baker)
1974 911 Sunroof Coupe

I think you guys read the ads wrong: it doesn't say it'll increase horsepower, it says it will increase idle!!! So where's the problem?
regards,
jlex.

I trashed myine over a year and a half ago...screw those things


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Leland Pate
___'99 Dodge Dakota <-which pulls the "real" car
___'79 SC Targa
Which hopefully will be back together soon...

I just dyno'd my 83SC and got 183hp at the rear wheels.I use a K&N.The guys at the dyno shop we used said they have run tests with and without K&N filters.From their tests they concluded the K&N does benifit SOME cars and it does HURT others, the guys memtioned as an example a 1995 Nissan 300z
with a K&N it got 20hp more than stock !
They said the dyno is the only way to really
know if you are getting your moneys worth.
I agree !

I bet those puppies will sell well on EBAY. To bad they won't fit Honda, Toyota, Nissan, etc. street racers. You could double your money with a bit of hype.

You can never go wrong with a Porsche OE part.
Before you toss a Porsche OE part for some aftermarket thing, you should always ask: WHY? In other words, what EVIDENCE am I relying on to toss my OE part, what EVIDENCE (and I mean good, non-biased, reliable evidence) do I have that the aftermarket part works BETTER on my Porsche than the OE Porsche part.
That simple test will save you lots of time and money. If you run that test, one would never put a K&N on their car in the first place.

I bought my first four-wheeled vehicle in or around 1980. That's twenty years now that I've been replacing parts on German cars.

Aftermarket parts for German cars is quite a gamble. The German parts are fiercely local and will attack and reject Spanish and Asian parts. Apparently the racial thing survives.

It's not too hard to put "upgrade" parts on a Chevrolet or a Nissan, but where do you find parts better than the ones on Porsches? Who makes better electrical devices than Bosch? Who makes better wheels than Fuchs? Who makes better instruments than VDO? Etc, etc.

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'83 SC

Welllllll, we know that Lucus cannot make refrigerators, relays, switches nor gauges.
Chuck
83SC

Hello

The K&N do flow more then most airfilters on the marked. But they used the cheapest to compare. I remeber the factory used K&N on rallies as they will still flow even with dirt on it and you can wash it so your spare parts box is smaller.

A german Automagazine made an comparetest on a Diesel engine to find out whats up. Power increase none but engine had siliconose after 50 000 km, in words to much sand landed in there.

So cleaning and renewing the oil should be in much shorter intervalls then K&N says.

Well made with one car and a Disel you can´t generalize it.

On Ferraris the K&N allways give improvments as the original Filters are dirt cheap ( But sold oppesite ) and have on old cars a 5000 km Change intervalll ( Ever done on a 365 GT/x ? 5 hours work for 2 filters )

Grüsse

I'm a little puzzled--the undereducated engineer in me says the only way to flow more air is to either increase the surface area of the filter or increase the size of the holes in the filter. Since most of those K&N's that I see out there seem to be smaller than stock (no way that dinky cone has more surface area than a stock SC filter!), that must mean they're more porous.

Doesn't that mean you end up flowing more stuff besides air? Like grit???

Cheers from dust-storm land,

blue

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blue
'81 SC Targa

Originally posted by BlueSkyJaunte:
Since most of those K&N's that I see out there seem to be smaller than stock (no way that dinky cone has more surface area than a stock SC filter!), that must mean they're more porous.

Doesn't that mean you end up flowing more stuff besides air? Like grit???

Nail, head, hit. Another reason to avoid this overhyped piece of junk.

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1988 black on black Coupe

When I bought my 78sc some years back it had a K&N already installed, how long it was in prior to my purchasing the car, I wish I knew. I tossed it out and put a fresh K&N in soon after for peice of mind, why I went with the K&N again I guess I was just like most consumers. I was Ignorant to the adverse effects that it might have on the engine, I really didnt know better untill just lately reading other peoples experiences with the product. I put my old K&N up to the light and what do you suppose I saw....completely clear images right through it. Not good. There are many tiny holes but not so tiny that you cant see through to the other side. Try that with a stock paper filter and you will be able to make out that there is light behind it but you cannot see through it. Now I have never found dirt in my airbox but Im changing over anyway...TargaEuro