How many mile are K&N airfilters good for??
02-19-2003 | 03:19 PM
#2
Cap'n Insane the Engorged
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From: Where Mountains Meet the Sea
Unlimited (ten years) - they should be cleaned every 30k-50k miles. When cleaning don't over oil and let it sit on newspaper over night. This will decrease the chance of setting off your mass air flow sensor.
02-19-2003 | 03:49 PM
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From: Austin,TX
Rob
Are you at work or at home now?? My 996 is in CA and I'm in TX. I am packing and need to know the width and length of the trunk. If you have access to your car could you measure the dimensions. I have to leave in around 1.5 hrs so if you can measure before then great, if not thanks anyways.
Are you at work or at home now?? My 996 is in CA and I'm in TX. I am packing and need to know the width and length of the trunk. If you have access to your car could you measure the dimensions. I have to leave in around 1.5 hrs so if you can measure before then great, if not thanks anyways.
02-19-2003 | 10:44 PM
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Drifting
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From: redmond wa
K&N
Only good for as long as it takes the owner to figure out: A}It was a waste of money (NO GAIN!) or: B} the oil that wicks off the filter and into the intake airstream musses up the mass airflow sensor.
Musses up....contaminates the mass airflow sensor enough to foul up the fuel/air mixture and thereby over the long term result in fatal engine failure. When that happens be sure and remove the K&N before asking the dealer about warranty repairs.
Only good for as long as it takes the owner to figure out: A}It was a waste of money (NO GAIN!) or: B} the oil that wicks off the filter and into the intake airstream musses up the mass airflow sensor.
Musses up....contaminates the mass airflow sensor enough to foul up the fuel/air mixture and thereby over the long term result in fatal engine failure. When that happens be sure and remove the K&N before asking the dealer about warranty repairs.
02-19-2003 | 11:53 PM
#5
Cap'n Insane the Engorged
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From: Where Mountains Meet the Sea
It is against the law (Magnuson-Moss Warranty) for a manufacturer to require the use of a specific brand of air filter unless it provides a free replacement air filter.
They come pre-oiled just don't over oil when cleaning, to be safe buy a new one.
Porsche uses BMC (virtually the same as K & N) in their race cars.
K &N claims it increases air flow by 60%
IMHO it also improves the sound.
They come pre-oiled just don't over oil when cleaning, to be safe buy a new one.
Porsche uses BMC (virtually the same as K & N) in their race cars.
K &N claims it increases air flow by 60%
IMHO it also improves the sound.
02-20-2003 | 02:17 PM
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From: seattle
Increases air flow by 60%...
WOW!! 465HP amazing!
I think you really mean decreases airflow resistance by 60%...
And there's only two ways to do that:
More filter surface area...more "pores".
Less filtration capability...larger "pores".
WOW!! 465HP amazing!
I think you really mean decreases airflow resistance by 60%...
And there's only two ways to do that:
More filter surface area...more "pores".
Less filtration capability...larger "pores".
02-20-2003 | 02:41 PM
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Yeah these K&N filters are really not worth it. Ask yourself why they never publish any dyno results in their ads. Not a one. But we do get to see a little ping pong ball go up higher in a tube... Gimme real before/after dyno readings, or gimme a break.
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02-20-2003 | 04:01 PM
#8
Cap'n Insane the Engorged
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From: Where Mountains Meet the Sea
Air flow does not directly correlate w/HP, though less restriction does provide more efficient combustion.
Air filters are not rated by micron size on an absolute basis. The proper rating system for air filters is a testing procedure developed to measure the efficiency of the filtration media at varying micron sizes. These tests are performed in accordance with the Society of Automotive Engineer's testing procedure. K&N air filters have an overall efficiency rating of between 97% and 99%, exceeding industry standards.
As far as dyno results, the density of air varies with both the weather and altitude. There is more air in the same amount of space when the weather is cool than when it's hot. One way to get a performance boost is to only drive in cold weather. Since air is variable, air flow claims in absolute terms are not meaningful.
Air filters are not rated by micron size on an absolute basis. The proper rating system for air filters is a testing procedure developed to measure the efficiency of the filtration media at varying micron sizes. These tests are performed in accordance with the Society of Automotive Engineer's testing procedure. K&N air filters have an overall efficiency rating of between 97% and 99%, exceeding industry standards.
As far as dyno results, the density of air varies with both the weather and altitude. There is more air in the same amount of space when the weather is cool than when it's hot. One way to get a performance boost is to only drive in cold weather. Since air is variable, air flow claims in absolute terms are not meaningful.
02-20-2003 | 04:52 PM
#9
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From: redmond wa
465HP was a PUN....
But not altogether...
If my 01 C4 were to somehow suck in 60% more airflow I would fully expect the engine ecu to use the proper mixture ratio which I suspect would result in something on the order of 465HP, until the engine self destructed a few seconds later anyway.
But not altogether...
If my 01 C4 were to somehow suck in 60% more airflow I would fully expect the engine ecu to use the proper mixture ratio which I suspect would result in something on the order of 465HP, until the engine self destructed a few seconds later anyway.
02-20-2003 | 05:02 PM
#10
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From: redmond wa
I wonder...
Does filter efficiency really come into play at any time except at, or near, WOT?
And at WOT, HIGH flow rates, does the lack of higher atmospheric pressure become a greater limiting factor than the few percentage points of additional efficiency that might be gained from a freer flowing, K&N, filter?
Does filter efficiency really come into play at any time except at, or near, WOT?
And at WOT, HIGH flow rates, does the lack of higher atmospheric pressure become a greater limiting factor than the few percentage points of additional efficiency that might be gained from a freer flowing, K&N, filter?
02-20-2003 | 07:27 PM
#11
Cap'n Insane the Engorged
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From: Where Mountains Meet the Sea
</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by wwest:
<strong>465HP was a PUN....
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">LOL- you obviously don't know what a pun is.
I'm not sure about your second point either. In a NA engine at WOT the air density approaches that of atmospheric pressure. When the air density is less than atmospheric pressure a vacum is measured in the intake manifold, i.e. during idle.
<strong>465HP was a PUN....
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">LOL- you obviously don't know what a pun is.
I'm not sure about your second point either. In a NA engine at WOT the air density approaches that of atmospheric pressure. When the air density is less than atmospheric pressure a vacum is measured in the intake manifold, i.e. during idle.
02-20-2003 | 08:31 PM
#12
Drifting
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From: Roseville, CA USA
I guess there is no good reason to have one <img border="0" title="" alt="[Wink]" src="wink.gif" /> <img border="0" title="" alt="[Wink]" src="wink.gif" /> <img border="0" title="" alt="[Wink]" src="wink.gif" />
...unless of course you are winning the 24 hours of Daytona or LeMans or ???
<img src="http://pw1.netcom.com/~ljcook/images/GT3RS_BMC.jpg" alt=" - " />
...unless of course you are winning the 24 hours of Daytona or LeMans or ???
<img src="http://pw1.netcom.com/~ljcook/images/GT3RS_BMC.jpg" alt=" - " />
02-20-2003 | 09:22 PM
#13
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From: redmond wa
24 hours of Daytona.
Car #5, a Lola/Nissan came in first in class and seventh overall. You might have noticed that the rear spoiler said something like "West Family Foundation".
Nobody asked me but had I been asked I would have said use the minimum amount of air filtration that gives us the best performance but still with 99.99% probability that the engine will last 24 hours. A chicken wire filter may have met that criteria.
And, I'd have to check but I don't think K&N was one of our sponsors. Had they been, then I have no doubt that we would have been using a K&N regardless of actual benefit, other than having their money.
We get to present $150,000, lap pledges, to Seattle Children's Hospital next week.
Car #5, a Lola/Nissan came in first in class and seventh overall. You might have noticed that the rear spoiler said something like "West Family Foundation".
Nobody asked me but had I been asked I would have said use the minimum amount of air filtration that gives us the best performance but still with 99.99% probability that the engine will last 24 hours. A chicken wire filter may have met that criteria.
And, I'd have to check but I don't think K&N was one of our sponsors. Had they been, then I have no doubt that we would have been using a K&N regardless of actual benefit, other than having their money.
We get to present $150,000, lap pledges, to Seattle Children's Hospital next week.
