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  #1  
Old 06-24-2021, 10:44 AM
Lycosaurus's Avatar
Lycosaurus Lycosaurus is offline
 
Join Date: Mar 2006
Location: Ottawa, ON
Posts: 663
Default Ever-shrinking K&N air filter - a continuing saga

VAFers have well documented the K&N filter shrinkage. Mine has lasted almost 12 years and it has shrunk a little, though my need for replacement is due to the rubber seal portion having hardened like a rock. Time for a replacement.

So I ordered a replacement filter No. E-3260 for the o-320. Looks like this filter also shrinks during the manufacturing stage. This new one is about 0.160" shorter than my older one. Anyone see this too, or am I just lucky?

This means I need to add additional proseal to the bottom lip of the emergency air intake.
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  #2  
Old 06-24-2021, 02:26 PM
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9GT 9GT is offline
 
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Default

Are you sure you got the right one? I have the Vanís FAB for mi IO-320 and it uses an E-3450.
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  #3  
Old 06-25-2021, 09:41 AM
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Lycosaurus Lycosaurus is offline
 
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Location: Ottawa, ON
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Quote:
Originally Posted by 9GT View Post
Are you sure you got the right one? I have the Vanís FAB for mi IO-320 and it uses an E-3450.
The dimensions for both models are specified to be 2.5" in height. The new filter measures 2.24", while the old one has shrunk to about 2.4". The E3260 fits the bottom aluminum plate of the filter assembly perfectly, just like the original, therefore I believe I have the correct filter. I will double check my measurements though, and report here if different.

Here are the specs for these filters from the K&N web site (knfilters.com):

E-3260
Height.................. 2.5 in (64 mm)
Inside Diameter..... 5 in (127 mm)
Outside Diameter... 6.375 in (162 mm)

E-3450
Height.................. 2.5 in (64 mm)
Inside Diameter..... 6.25 in (159 mm)
Outside Diameter... 7.75 in (197 mm)
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  #4  
Old 06-25-2021, 10:55 AM
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Ralph Ketter Ralph Ketter is offline
 
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Location: La Luz, NM
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Default E-3250 in E-3260 box?

Did you check the part number on the filter itself? Maybe you got an E-3250 packed in an E-3260 box.
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  #5  
Old 06-25-2021, 11:13 AM
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Lycosaurus Lycosaurus is offline
 
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Location: Ottawa, ON
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Quote:
Originally Posted by Ralph Ketter View Post
Did you check the part number on the filter itself? Maybe you got an E-3250 packed in an E-3260 box.
Hmmm... there were no numbers stamped on the filter that correspond to the model numbers. I may make a call to K&N and find out more on how to identify which filter it is. Thanks for pointing this out.

E-3250
Height..................... 2.25 in (57 mm)
Inside Diameter........ 5 in (127 mm)
Outside Diameter...... 6.375 in (162 mm)
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Last edited by Lycosaurus : 06-25-2021 at 11:25 AM.
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  #6  
Old 06-25-2021, 07:17 PM
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Lycosaurus Lycosaurus is offline
 
Join Date: Mar 2006
Location: Ottawa, ON
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Talking Update

So here is an update...

I checked the box the filter came in, and it looks like the filter number and bar-code was placed over a previous sticker. I tried peeling it off, and it in fact looks like the previous sticker was an E-3250 (look at the 2nd image, with the 2 labels partially removed, exposing the back of the 2nd label... E-3250).

I purchased this filter via Amazon, full-filled by them, came in from California to Canada (could not find that filter in my part of the country). Called K&N tech support regarding the dimensions and my suspicion it was mis-labeled. I informed him that I had purchased the filter from Amazon and that I had started modifying the filter for my off-road vehicle. After checking the specs, the tech took down my contact information and said they would check their stock for quality control, and after checking one filter, they would send one to me as a warranty issue. Wow! Nice on K&N for owning it.

I may have wasted some time and effort on ordering and modifying the first filter, but am pleased they are sending me a replacement. Hopefully I will get some flying done this summer, as my annual inspection has been dragging out for too long now.
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  #7  
Old 06-25-2021, 10:41 PM
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bruceh bruceh is offline
 
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Location: Ramona, CA
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I replaced mine last year. Got the new one from Van's. Here they are side by side. The original lasted 6 years.


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  #8  
Old 06-25-2021, 11:35 PM
McStevens McStevens is offline
 
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6 years? 12 years!

Why?
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  #9  
Old 06-26-2021, 04:11 AM
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plehrke plehrke is offline
 
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Location: Defiance, MO
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Quote:
Originally Posted by Lycosaurus View Post
informed him that I had purchased the filter from Amazon and that I had started modifying the filter for my off-road vehicle.
.
.
.

I may have wasted some time and effort on ordering and modifying the first filter, but am pleased they are sending me a replacement.
How/why are you modifying the filter?

I too need to modify the filter as the slightly off center snout in the filter box from intake snorkel to my Bendix fuel servo puts the heads of two of the bolts that hold on the servo under the filter. I carve out a bit of relief in the rubber upper cap of the filter to accommodate. The good thing is that it really traps in the “ever decreasing” filter. What I don’t like is that I can’t clock the filter differentially each annual to change which section of the filter faces forward and gets all the bugs.
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Last edited by plehrke : 06-26-2021 at 04:30 AM.
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  #10  
Old 06-26-2021, 10:52 AM
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Lycosaurus Lycosaurus is offline
 
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Location: Ottawa, ON
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Quote:
Originally Posted by McStevens View Post
6 years? 12 years!

Why?
There is an aluminum plate that fits on the bottom of the filter. Over time and flight hours, the filter's rubber components shrink and make it so that plate becomes a difficult fit. The rubber has hardens over time, likely to exposure of fuel mist. My old filter had close to 1100 hours.
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