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  #1  
Old 04-10-2023, 06:31 AM
mikelupo mikelupo is offline
 
Join Date: Jan 2020
Location: Massachusetts
Posts: 72
Default RV-10 Air filter box problem

Sorry. I have no photos to support this post.

This is a flying RV-10 (1100 hours) that uses the Van's provided filter airbox for the K/N-E3450 air filter.

I noticed during condition inspection that the filter does not fit snug at the top of the airbox anymore. I can see about a 1/4" gap. Thinking the air filter shrunk from washing/drying and re-oiling, I purchased a brand new one. Same outcome. My only conclusion here is that the airbox itself is the issue.

I think the problem is that the lower part of the air filter box has lost its "stiffness" or shape and no longer provides enough support to keep the air filter snug at the top.

Aside from ordering a new airbox kit (which are back-ordered), I'm curious what other owners have done to address this. Surely I can't be the first.

Thanks,
Mike
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  #2  
Old 04-10-2023, 06:41 AM
Tooch Tooch is offline
 
Join Date: Nov 2011
Location: Amelia, Va
Posts: 399
Default

Epoxy a sheet of aluminum on the bottom of the airbox. It will also keep the filter from rubbing through the fiberglass.
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  #3  
Old 04-10-2023, 07:14 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Default

Quote:
Originally Posted by Tooch View Post
Epoxy a sheet of aluminum on the bottom of the airbox. It will also keep the filter from rubbing through the fiberglass.
+1

I add a piece of Alum to the bottom to prevent the F/G from wearing away. In your case, just modify size or qty of Alum sheets to get the height you need. However, be sure to match drill the drain holes.
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  #4  
Old 04-10-2023, 07:18 AM
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larrynew larrynew is offline
 
Join Date: Oct 2007
Location: In New Braunfels, ist das Leben schŲn!
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Default

Quote:
Originally Posted by Tooch View Post
Epoxy a sheet of aluminum on the bottom of the airbox. It will also keep the filter from rubbing through the fiberglass.
+2

500 hours and filter still fits perfectly.
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  #5  
Old 04-10-2023, 08:31 AM
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rvanstory rvanstory is offline
 
Join Date: Dec 2016
Location: New Braunfels
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Quote:
Originally Posted by larrynew View Post
+2

500 hours and filter still fits perfectly.
+3 Same with my RV-10 after 420 hours.
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  #6  
Old 05-05-2023, 10:25 PM
dhmoose dhmoose is offline
 
Join Date: Jun 2010
Location: Portland, OR
Posts: 351
Default K/N E3450 size discrepancies

For what it is worth, I have seen the filters dimensionally change after a year of use. They typically shrink circumferentially and it is noticed by finding the old filter having space between it and the small tabs that keep it in place. I vaguely recall Vans speaking to this issue years ago but it seems like the only remedy was to replace the filters annually as opposed to cleaning/oiling the lifetime filters when needed. During my inspection today, I removed the air box and saw that the old filter didnít seem altered. When I went ahead and placed the new one in to compare, the new one was dimensionally smaller in height and didnít make contact with the top plate allowing air to bypass the filter. When I compared the two filters side-by-side on the bench, there was an an obvious height difference. Strange.
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  #7  
Old 05-06-2023, 08:14 AM
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Walt Walt is offline
 
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 7,324
Default

Do a search on "shrinking air filters".
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  #8  
Old 05-06-2023, 08:37 AM
Kyle Boatright Kyle Boatright is offline
 
Join Date: Aug 2005
Location: Atlanta, GA
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Quote:
Originally Posted by larrynew View Post
+2

500 hours and filter still fits perfectly.
Interesting. 85 hours on the one in the Rv-10 and the bottom shrank in diameter so much the filter no longer sealed against the air box. I assume the bottom sees more fuel exposure in shutdown than the top and that was the causal factor.

The filter was cone shaped when I removed it.

The ones on the RV-6 have lasted 5 years or so.
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  #9  
Old 05-13-2023, 01:00 AM
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ScottSchmidt ScottSchmidt is offline
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Join Date: Dec 2005
Location: Salt Lake City, Utah
Posts: 1,182
Default It Shrunk

Like others have said, it has shrunk and needs to be replaced.
You be surprised how much it has changed shape when you get the new one.
Once you look at it again you will also see how much it has shrunk in diameter. I just replaced mine again this annual.
I think this is the part number for the Tempest brand rather than K&N.

https://www.aircraftspruce.com/catal...s_08-17580.php
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