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Old 01-22-2018, 05:15 AM
RV3Kev RV3Kev is offline
Join Date: Sep 2017
Location: Traralgon Australia
Posts: 46
Default Firewall Recess for

I?m starting work on my firewall soon and I would like to keep open the option of using a CS prop. To do this it?s necessary to add a RV7/9 type recess into the firewall.

Does any have any information on the correct location on the firewall?
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Old 01-22-2018, 07:40 AM
Scott Hersha Scott Hersha is offline
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,955

If it's like the RV4, you'll need to modify the firewall where the bump out is for your rudder pedals - to make room for the aft mounted prop governor. This area would be bumped in between your rudder pedals. Vans has plans for this, and maybe even kit parts (stainless steel).
RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019 Flying
RV6/Used kit purchased 2021 building
Cincinnati, OH/KHAO

Last edited by Scott Hersha : 01-22-2018 at 07:43 AM.
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Old 01-22-2018, 09:04 AM
David Paule David Paule is offline
Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,994

I went through this on mine.

I bought both the F-601K-1 recess and the one for the RV-4. The RV-4 recess is completely useless for the RV-3 since the -4 has a far different firewall shape. The F-601K-1 recess was not tall enough so I had to add on to it.

I described this part of my construction iin my blog here on VAF, in posts 241 through 245. I'm repeating some of the photos below. If you're only adding the governor, the stock recess ought to be fine. Adding the filter changed things. Although it would be heavier, a remote oil filter might be appropriate here.

Here's what I learned for the locations of things:

This is the back of the engine:

The box I built:

It was so handy having the engine on hand before I started the firewall!

One thing that I'm not looking forward to is maintenance with the recess. While Andy Hill assured me that the filter can be changed, I think that both that and cleaning the recess might be difficult.

RV-3B, now skinning the fuselage

Last edited by David Paule : 01-22-2018 at 09:14 AM.
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Old 01-22-2018, 10:35 AM
sf3543 sf3543 is offline
Join Date: Jan 2005
Location: San Antonio, TX
Posts: 1,090

I also used the 601K-1 recess and it works fine without being modified.
The engine is an O-320-D1A with the angled oil filter adapter and MT governor using VAN's bracket. The bracket needed minor tweaking to work.
I mounted it centered on the FW with the top of the recess riveted to the top horizontal FW angle.
I have some detailed pictures but don't want to take the time to figure out how to post them.
Email me if you would like the pictures.

sf3543 at sbcglobal dot net

Good luck
Steve Formhals
A&P, Tech Counselor & Flight Advisor
Legend Cub
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Old 01-23-2018, 03:44 AM
randylervold's Avatar
randylervold randylervold is offline
Join Date: Dec 2004
Location: Mill Creek, WA
Posts: 617

I'm sorry I don't have the exact dimensions, but you could probably extrapolate from the photo at the top of this page...
Randy Lervold
RV-12iS, empennage/tailcone complete, wings currently, fuse in box
RV-3B, first flight 2007 - sold
RV-8, first flight 2001 - sold
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