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Old 05-07-2019, 11:56 PM
jtate747 jtate747 is offline
Join Date: Dec 2017
Location: Roseville, CA
Posts: 11
Question Carb/Air filter clearance

(I am building an RV-6A. I have an O-360 out of a Mooney with 60 hours on it installed. Unfortunately, the air filter box is contacting the nose gear. There are many variables that can cause this, so I am wondering if ....
- The oil sump is deeper than normal for an RV? How deep is the normal sump?
- The Carb is taller than another standard configuration (6.5 inches from oil sump to base of carb)
- Other ideas?
Also, the engine is offset to the left about an inch, but I understand this may be normal.
Is there a shorter carb option? Smaller air filter?
The air filter box actually contacts the nose strut. I have not installed it yet.
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Old 05-08-2019, 04:10 AM
noelf noelf is offline
Join Date: Nov 2007
Location: Cary, N.C.
Posts: 1,185

I had the same issue when I built my -6A. I cut off the offending area from the fiberglass FAB and glassed in the area to clear the nose gear strut. I also had some issues with the bottom left side of the FAB contacting the cowling carb air inlet side and had to bevel the FAB to clear this area also.
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Old 05-08-2019, 08:53 AM
az_gila's Avatar
az_gila az_gila is offline
Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 9,952
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I made a small "bump in" where the nose gear is and also made a new mounting plate that took care of the offset and moved the FAB box a little further forward.
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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Old 05-08-2019, 01:03 PM
WingsOnWheels WingsOnWheels is offline
Join Date: Mar 2009
Location: Plano, TX
Posts: 1,909

I had a similar problem, but was able to make a new top plate and get it far enough away. Still requires that the nose gear fairing is modified.
Colin P.
RV-6A #20603
Complete 5/10/19
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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Old 05-09-2019, 07:05 PM
jtate747 jtate747 is offline
Join Date: Dec 2017
Location: Roseville, CA
Posts: 11

Thanks Gentlemen,

I will probably need to do a combo of the ideas above to make it work. Just making sure I am on the right path, before I start changing proven designs. Just seemed odd to me that “My” O-360 carb is lower than all the others ever built . . . .

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