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Old 12-22-2021, 06:11 PM
jwoolworth jwoolworth is offline
Join Date: Nov 2015
Location: Canon City, CO
Posts: 1
Default Airbox for O-320-A2A

I have an O-320-A2A on my RV-9A. This is a narrow deck, parallel mount engine with the carburetor in the extreme aft part of the sump. I ordered a Vanís airbox kit for the O-320 but it is not compatible with this engine due to the aft location of the carburetor (the airbox interferes with the engine mount and the nose gear leg). I talked with an A&P who told me that airboxes for this application do exist but Iím not sure where to find one.
Any thoughts or leads?
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Old 12-22-2021, 06:33 PM
rockwoodrv9 rockwoodrv9 is offline
Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 3,017

Iím not sure what box you have by your description. Do you have a picture? The FAB is a tricky part to get right. If it is the same as mine I have some pictures. I have a D2A
Williamston MI
O-320 D2A
Flying N376E
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Old 12-22-2021, 07:29 PM
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sbalmos sbalmos is offline
Join Date: Oct 2011
Location: Liberty Twp, OH
Posts: 699

I originally had the same issue with my IO-320-E1A. Honestly, if you're willing to go down this route, is to swap out the sump for one that has the airbox intake in the midpoint. Also if it was like mine, it may be that the -A1A also has a vertical oil pickup line inside. That's another very easy thing to swap out - two bolts to take out the tube, a plug to remove to allow oil pickup through the normal in-case pickup, and a new oil pickup screen, etc.
Scott Balmos - RV-9A N112SB
Cincinnati, OH, KHAO
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Old 12-22-2021, 07:51 PM
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Vlad Vlad is offline
Join Date: Oct 2008
Location: Utah
Posts: 8,527

Jim if you decide to sell the airbox kit I am interested.
Не имей сто рублей, а имей сто друзей.
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Old 12-22-2021, 07:54 PM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,762

Yes, easiest solution might be what sbalmos suggests because of the tight space between the carb & gear leg.
If you are up for a fiberglass adventure, you could come up with a custom snorkel affair using a K&N conical filter & inlet.
Now would be the perfect timing for Dan H to step in with an elegant solution.
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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Old 12-22-2021, 09:12 PM
Zero4Zulu Zero4Zulu is offline
Join Date: Nov 2008
Location: Scio,Oregon
Posts: 313

I changed my sump to the more forward carb position but when I bought my RV6A with a O320 B3B (aft position carb) the builder made the FAB work with a custom top plate.
Steve S.
Rebuilt RV6A Flying!
Scio, OR
EAA Ch. 292
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