augustbailbonds

Watching speed channel today and see commercial for Accel Kool Blue air filters. Are they better than K&N?

August Spillers
81 928s (in need of some pimpin')

sweanders

I prefer the stock ones, using an air filter that isn't doing it's job properly can kill the engine.

Jfrahm

I do not care for K&N, I saw too much grit in the intake boots of my motorcycle fitted with K&N's. With K&N you have to hope that dust and grit hits an oily fiber and sticks. Some just passes through.
The Accel appears to be the same sort of thing. I'd pass on both.

-Joel.

Nicole

Sometimes, Porsche does something right. It does happen, believe me!

You might want to do a search on this board regarding K&N, and you'll get an idea of the risk you would be taking with an aftermarket filter.

To the best of my knowledge, nobody has ever proven that the factory intake filter is any kind of bottleneck - they kept it the same up to 5.4 Liters and 354HP. Even stroker engines run well with it - it's doubtful an '81 needs more air than those.

There are lots of other nice things to enhance your 928. The following sites will give you some ideas:

www.jageng.com
www.devek.net
www.928intl.com
www.928gt.com
www.hookedoncars.com

Enjoy!

PS: Where are you located geographically? Make sure Ron H has your business card, just in case...

hacker-pschorr

Stock - I've seen too many 928's with K&N filters with debrit on the MAF screen that should NOT have made it through the filter.

mspiegle

you need to properly keep your filter oiled. If you don't, it won't work. Also, changing your filter all the time will make matters WORSE. The filter actually needs to be dirty to work properly.

John Struthers

Irk!
Here we go again...
If you are just pimpin your sHARk take Nicole's advice/suggestions.
As to the K&N's I just pulled mine on saturday.
Keep in mind I have an 82' -aka early model - and do not have the hot wire.
I have had zero oil pooling, zero dust, or, grit residue as witnessed by the fabled white cotton sock wipe test. Others have commented that there were major bug parts that got by the filter, which is
physically impossible. I have on one occasion noticed that because of the angle of the airbox/filter that you can if you are lazy and don't disconnect the air tubes and don't completely remove the top cover you can spill/knock debris into the lower box when removing the filter. If you don't seat the filter properly things will also slip by. If your bungee's are dry rotted and you hit a bump debris can slip by. In the case of late model -hot wire, and high compression- sHARKs there is enough anectdotal
information (even for the likes of me) to indicate that oil off of the filter even when correctly
applied is being sucked across the hot wire coating/disabling it and eventually pooling in low lying areas of the intake system along with oil from the smog pump or recirculation/breather components of the engine. Little is mentioned of the countless numbers of intakes with dust, grit, and oil residues in the intake systems of stock air cleaner equipped sHARKs which I have witnessed while searching for sHARKs in the past. I have desert raced and Moto Crossed bikes -the latter in Pennsylvania- neither desert sand nor 'Talc'ed shale and clay dust got past the K&N's on my bikes unless we screwed-up and overtightened the clamps which would oval shape the intakes on the back of the carbs letting grit by.
I have offered to take the discarded K&N's off of peoples hands when they went back to stock filters but for some reason everyone wants money to discard them????To be fair there are some sHARKs as mentioned above that I WOULD NOT put a K&N on. Also some diesel applications as well as any application with a hot wire sensor.
There is a site with with severe testing parameters but final flow rates where the K&N is shown to have failed indicate that the paper element would stop flowing air -clogging - at roughly the same time. There must be hundreds of test's on the same site for and against the K&N or the OEM filters.
I suggest a grain of salt... before you go pro or con.
If you feel uncomfortable don't use the K&N.

Mongo

neither, I prefer the EXPENSIVE ORANGE

Sierra Shark

I have used K&N on my 86 euro with horrible results. Got a little more H.P. but totally messed up my intake. I know of S4 owners who used K&N and had trouble with the hot wire getting build-up and sending false readings. Nicole is right, you can acheive lots of H.P. gain with other less painful mods ie; flow through exhayst, muffler bypass, Nology wires, chip set, etc.... Stick to the stock filter. Porsche got this one right. Best of luck.

Imo000

"Got a little more H.P. but totally messed up my intake."

Please, elaborate on this?

hacker-pschorr

IMO,
I can't speak for Jeff but a few VW owners I know are/were fighting the dealers because they all installed K&N filters. Withing the first year - still with the factory oil - engine light problems. The dealers found the K&N oil all over the intake and covering the hot wire on the MAF.

Sierra Shark

That's it in a nutshell. To much oil blow by in the intake choked it down and MAF was a mess. And yes I followed the instructions to the letter. I even tried less oil than what it whould use and the same problem. You have to remember how much air that intake system sucks in to begin with. That's no V-6 under the hood. However, out of fairness, I have run a K&N in my 1998 Dodge Ram truck without any problem. And that bad boy is subjected to alot of off road dirt.

PorKen

I have a theory that the some of the 'bug parts' might have come from compromised hoses to/from the charcoal cannister, which lives in the (dusty, dirty) front fender.

Nicole

Aside from the problems mentioned here - why would anyone voluntarily increase the maintenance needs of their 928??? As if old cars like ours wouln't already need enough attention...