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Stupid Air Filter Question

 
Old 10-04-2009, 09:57 PM
  #31  
whiteNSXs
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Originally Posted by worf928 View Post
If it makes you feel better to run your air filter upside down and to choke-off air to the mass-air sensor, and to run the air filter in an orientation contrary to the German-language printing that appears on an actual Porsche filter then by all means do so.

You are however, still, quite wrong.
Well, in that case I stand corrected. Thanks.
This picture threw me off to make that mistake. For some reason, my filter fits better with the curved side facing down. Just went to the garage flipping the filter back with the curved side facing up.
Steve
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Old 10-04-2009, 10:00 PM
  #32  
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Originally Posted by Mrmerlin View Post
Pay no attention to the arrows stamped on the sides of the 928 filter they are for packaging when the filter is made..
( I have seen arrows that point in both directions on different filters)
So a little bit of common sense is required here......

On a 928, The filter has 2 sides , with the filter sitting on a flat surface the raised part is the the side thats facing the incoming air, the flat part faces the MAF/ throttle body.
Note, This Only applies to the 928 air filter housing.


Steve if the filter that you have fitted ( in any of your other cars) can be installed so that a raised portion of it faces away from the throttle housing then you should install it this way, it will increase the air box volume.
Once a filter has been installed it is not a wise idea to try to clean it so it can be turned around. as fine particles will be sucked into the engine.
Replace the filter and install it the correct way.

That said there are some filters that will only fit one way and are in fact made to fit one way as in the bigger or raised side faces the throttle, in that case install the filter the way it fits best into the air cleaner housing

BUT for a 928 the filter should be sticking up when you fit the top cover of the air cleaner housing
Got it. Thanks. It is unique to the 928 with the curved side facing up. Just went down to switch it back.
Steve
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Old 10-04-2009, 10:03 PM
  #33  
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Originally Posted by whiteNSXs View Post
Got it. Thanks. It is unique to the 928 with the curved side facing up. Just went down to switch it back.
Steve
your using a new filter ?
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Old 10-04-2009, 10:13 PM
  #34  
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No, I have a new filter that I just put in with the curved side facing down. But I just went to the garage to put the old but good filter back to the way it came (curved side facing up.) I have not driven the car.
Steve
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Old 10-04-2009, 10:36 PM
  #35  
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Steve just to be clear............ if you have a filter that was positioned incorrectly then you turn it over and install it, the dirty side will now be facing the intake and any loose dirt will be sucked into the engine.

From your lats post it is not really clear what your doing?????
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Old 10-05-2009, 12:22 AM
  #36  
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Originally Posted by Mrmerlin View Post
Steve just to be clear............ if you have a filter that was positioned incorrectly then you turn it over and install it, the dirty side will now be facing the intake and any loose dirt will be sucked into the engine.

From your lats post it is not really clear what your doing?????
He thought the PO had the filter installed wrong so he bought a new one to install it the way he thought it should be. But the PO was right so he put the old filter back the way it was. He said he did not start the car. He should be fine.
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Old 10-05-2009, 12:32 AM
  #37  
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Originally Posted by namasgt View Post
He thought the PO had the filter installed wrong so he bought a new one to install it the way he thought it should be. But the PO was right so he put the old filter back the way it was. He said he did not start the car. He should be fine.
Exactly. I now have the old but good filter back in the car with the original configuration from the previous owner. That is, curved side facing up. It was however much better fitting with the curved side facing down. I have a Purolator one made in Austria.
Steve
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Old 10-05-2009, 11:19 AM
  #38  
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Steve you are correct about the filter fitting better, but operational wise it should have the ridge facing away from the throttle plate.
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Old 10-06-2009, 06:59 PM
  #39  
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Mr. coffin? Please meet Mr. Nail:
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Old 10-06-2009, 07:28 PM
  #40  
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How'd you get an air filter that says 'dot' on it?
And where are those stinkin' arrows that point to upside/airflow/magnetic west.

(mein kar was built in West Germany.)
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Old 10-06-2009, 08:36 PM
  #41  
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If you install it backwards it says N380-d0i
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Old 10-06-2009, 09:20 PM
  #42  
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Originally Posted by worf928 View Post
If you install it backwards it says N380-d0i
.............and thats the K&N number; we all know that story.

I believe the lid is fully secure unless Nosferatu rises.
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Old 10-06-2009, 09:26 PM
  #43  
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Originally Posted by worf928 View Post
Mr. coffin? Please meet Mr. Nail:
Don't tell any body, but that is why the filter in my car is a Porsche filter, so I could tell for sure which way it goes.
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Old 10-07-2009, 01:48 AM
  #44  
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for a quick reference if you look at the molded portion in the center edge of the filter it has the edges at slight angle the narrow portion should face down, the wider area should face up kinda like a funnel.
Nice pictures
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Old 10-07-2009, 11:09 AM
  #45  
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And for those K&N luvrs, note the pleating density of the N380-d0i paper air filter element.
Lots larger surface area to trap dirt/silt/filth.

Did joke to a few 928'ers at the Joisey Shore Tech Session that there's an easy way to free a few scant HP from the motor using the paper air filter, just take a sharp object and punch a few aerating holes in the filter.
Voila. Instant flow more air.
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