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06-27-2023, 10:09 PM
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Join Date: Jun 2016
Location: Cameron Park, CA
Posts: 1,041
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Air filter popped out in flight
Well, this was unexpected. I came home from a short (1.2hr) test flight, and lo and behold during my post-flight walk-around I saw this inside my air inlet:
Here's another view with the cowl off:
IO-360-M1B, horizontal (snorkel) induction.
It looks like something caused the air filter to buckle and bend up out of the snorkel. Obviously it needs to be secured better, but what are the physics that would cause this to happen in the first place? I thought that the engine is always "sucking" air down through the filter element, and you're not going to see any back pressure from the snorkel.
No indication of trouble in-flight. My CHTs and oil temperature were a little high, but I've been struggling with CHT temps all through phase 1 so it was not unusual.
Looks like I'm on the hook for at least a trip to the Aviation aisle in Autozone for a new filter. I know the filter can probably be bent back into shape but they're not expensive. I'll need to build a better "top" to secure the filter body. I have some ideas--maybe something braced diagonally across the top to hold down the whole thing. Anyone have any good designs?
__________________
Ryan Drake
Cameron Airpark, CA
https://stiletto.smugmug.com/RV7
Donated 12/16/2022
RV-7A (N12VD)
Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.
Last edited by Draker : 06-27-2023 at 10:13 PM.
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06-27-2023, 10:17 PM
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Join Date: Aug 2019
Location: Western Australia
Posts: 1,724
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Looks unusual, was there any backfire event?
__________________
Paul vS
Building RV-6A #22320 O-320 FP, slow build, 80% done.
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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06-27-2023, 10:18 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 9,262
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Hear any backfiring? Maybe during start?
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06-27-2023, 10:30 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 4,509
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Looks like a back fire. I have seen it a number of times and all due to a backfire.
__________________
Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - SOLD
N258SM RV14A - IO390EXP119 - Out of Paint shop & flying
Dues paid
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06-27-2023, 10:46 PM
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Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 1,139
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I don't think you need to modify the filter hold down at all, just find out what caused the deformation.
Just for a data point, before first flight, I had a back fire and the filter never moved and its held down just like yours.
__________________
Michael Fleming
Joseph, OR
sagriver at icloud dot com
RV-7 Slider #74572
Started 11/2016
First flight 03/27/2023 
N526RM
Donated for 2023 and so should you 
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06-27-2023, 10:49 PM
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Join Date: Jun 2016
Location: Cameron Park, CA
Posts: 1,041
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No huge backfiring observed. I get the usual little baby "pop pop pops" when I reduce power to descend, but nothing monumental that I recall. Maybe I missed it. Sounds like the consensus here is backfire.
__________________
Ryan Drake
Cameron Airpark, CA
https://stiletto.smugmug.com/RV7
Donated 12/16/2022
RV-7A (N12VD)
Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.
Last edited by Draker : 06-27-2023 at 10:53 PM.
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06-27-2023, 11:25 PM
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Join Date: Dec 2010
Location: Louisville, KY
Posts: 899
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Merlin pops are at the exhaust pipes.
Is the back side of the filter lightly toast?
__________________
RV-6, bought from builder.
O-320, slider, carb, mags, FP
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06-28-2023, 01:00 AM
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Join Date: Jun 2016
Location: Cameron Park, CA
Posts: 1,041
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Quote:
Originally Posted by moosepileit
Merlin pops are at the exhaust pipes.
Is the back side of the filter lightly toast?
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Nope. Other than the wire mesh being deformed, the filter is in good shape.
__________________
Ryan Drake
Cameron Airpark, CA
https://stiletto.smugmug.com/RV7
Donated 12/16/2022
RV-7A (N12VD)
Never give up on a dream just because of the time it will take to accomplish it. The time will pass anyway.
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06-28-2023, 04:22 AM
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Join Date: Oct 2007
Location: Jackson, MS
Posts: 1,952
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Looks like it was compressed from the sides like you see cards bend when shuffling. Was the fit super tight and it was wedged in place causing it to finally bend and pop out?
__________________
Webb Willmott
KJVW
RV8 - Current Build
N414WW Reserved
V35B - Flying
RV7A - N32WW (Sold)
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06-28-2023, 07:10 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 9,036
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Looks to me like the sides of the filter got squeezed inward, causing the filter deformation. If it were me, I would get the cowl off and closely examine the snorkel and the baffle ramp assembly. You are looking for what will hit what when engine moves 1" in any direction. Guessing the snorkel assy is hitting something during the more extreme vibrations seen at startup.
Larry
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Last edited by lr172 : 06-28-2023 at 07:13 AM.
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