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Old 01-27-2014, 08:34 AM
Brantel's Avatar
Brantel Brantel is offline
Join Date: Mar 2006
Location: Newport, TN
Posts: 6,798

Originally Posted by Walt View Post
Maybe someone can post the ID/OD of the replacement filter they bought (with no 'B' suffix) and I'll get the same on the new Van's filter.

Part E-3450 Product Specifications
Product Style: Round Air Filter
Height: 2.5 in (64 mm)
Inner Wire: No
Inside Diameter: 6.25 in (159 mm)
Outside Diameter: 7.75 in (197 mm)
Top Style: Open
Top Material/Finish: None
Air Filter Shape: Round
Filter Material: Cotton Gauze
Flanges: None
Package Contents: 1 Air Filter
Package Quantity: 1
Filter Re-Oiling Amount: 0.65 oz (19 ml)
Weight: 1 lb (0.5 kg)
Product Box Length: 8.5 in (216 mm)
Product Box Width: 3.63 in (92 mm)
Product Box Height: 8.63 in (219 mm)
Brantel (Brian Chesteen),
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Old 01-27-2014, 09:34 AM
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jthocker jthocker is offline
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I had one shrink and over the course of the 300 hrs this year, the relative movement had worn a hole in the bottom of the filtered air box.
Re glassed with 4 layers of cloth.
Jon Thocker
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Old 01-27-2014, 12:13 PM
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Walt Walt is offline
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Location: Dallas/Ft Worth, TX
Posts: 4,683

Well looks like you guys are right, the filter I removed is a full inch less in ID/OD measurements than the figures posted above by Brantel which matches with the filters I get from Van's.

I am amazed it could shrink that much!

So I guess the title should be changed to "The Amazing Shrinking Air Filters".
Walt Aronow, Dallas, TX (52F) RV7A, IO360, C/S, 1500+hrs

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Last edited by Walt : 01-27-2014 at 02:24 PM.
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Old 01-27-2014, 12:36 PM
xavierm xavierm is offline
Join Date: Aug 2005
Location: Los Angeles, CA
Posts: 439
Default Get them replaced

K&N will replace filters that shrank under their 'million mile warranty'. I've had a few replaced.
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Old 01-27-2014, 01:18 PM
larosta larosta is offline
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Location: Redlands, CA
Posts: 124
Default K&N Engineering Contact Info

Perhaps a call to them is in order. They have been pretty responsive to serious technical inquires in the past.

Send all product related inquiries to: If your question is vehicle specific, please provide the vehicle's year, make, model, and engine size in your email.

Phone: (800) 858-3333 or (951) 826-4000

Mailing Address:
K&N Engineering, Inc.
PO Box 1329
Riverside, California 92502

Physical Address:
K&N Engineering, Inc.
1455 Citrus St.
Riverside, California 92507
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Old 01-27-2014, 05:49 PM
Wayne Gillispie Wayne Gillispie is offline
Join Date: Apr 2009
Location: USA
Posts: 1,494

The air filters made of cotton shrink just like our clothing, especially when exposed to thermal cycles, 100LL and engine oil...oil draining down intake tubes and over priming.

This particular filter is undersized for the air volume passing through it for any of our engines of 360 cu in or greater turning 2700 rpm. Add to this the ram effect at 160-180 kias and it is easy to see why they shrink.

K&N does not warranty filters used for off road use.

I bonded a .032" aluminum plate to the fiberglass bottom to prevent the filter from wearing through and to provide better attachment for the alternate air door.
Good judgment comes from experience, and a lot of that comes from bad judgment.

Last edited by Wayne Gillispie : 01-27-2014 at 06:49 PM. Reason: Aluminum plate
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Old 01-27-2014, 06:27 PM
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jjconstant jjconstant is offline
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Old 01-27-2014, 11:12 PM
RVJeff RVJeff is offline
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Location: Pompano Beach, FL
Posts: 29
Default Another data point to all the data points...

I'm coming up on 400 hours and my filter has been filtering since March 2008. It's probably starting to get close to the picture that Walt posted at the very top. I need to think about getting a new one as well. Funny how these things shrink and thanks for the explanation why, guys.

So, there's another data point about the ever shrinking K&Ns filter.
Jeff Liebman
400 Hours on the Hobbs
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Old 01-28-2014, 01:55 PM
FlyArmy FlyArmy is offline
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Location: AZ
Posts: 180

This thread got me looking at my air filter while I have the plane apart. Almost 400 hours and 7 years old...don't think it's ever been replaced or cleaned but I'm not certain of that since I bought the plane flying. I looked on amazon and got a replacement E3450 after some automatic discounts when I went to checkout for $12 (only 7 left at that price). Can't beat that...hope it fits and hope others can benefit from that. Only one worked with the discount...I couldn't get more than 1 at that price.
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Old 01-28-2014, 02:15 PM
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LifeofReiley LifeofReiley is offline
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Originally Posted by xavierm View Post
K&N will replace filters that shrank under their 'million mile warranty'. I've had a few replaced.
Correct... while down for condition inspection, just send yours back in for warranty if shrunk up, it is covered. they do shrink.
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