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04-22-2012, 08:08 AM
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Join Date: Apr 2010
Location: Near Springfield, MO
Posts: 120
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Firewall recess for govenor?
I purchased a 4 built in 93 and am trying to convert from FP to a CS...someone mentioned older 4's didn't have a firewall recess for the govenor...can someone provide info on this for me? Pics of the recess...how to retrofit...ideas? I have a PCU 5000 located, which I understand is a fairly small govenor...will it work without firewall modification? Also, I am concerned because I have a Christianson inverted oil system, and think I may have a lot of stuff "in the way" for govenor installlation...anyone have this combination on a completed 4 ?
Thanks!
Charles
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04-22-2012, 08:35 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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I don't know about the -4 but if I had to do this on my -9 (assuming the recess wasn't installed during the initial build), you would have to remove the engine and engine mount to get access to the firewall.
You will need to cut a hole and then rivet the recess in place. One advantage to doing all this is it will give you the opportunity to inspect the engine mount and firewall.
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Bill R.
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04-22-2012, 01:29 PM
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Join Date: Jan 2005
Location: England
Posts: 1,087
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Quote:
Originally Posted by Mr Charles
... someone mentioned older 4's didn't have a firewall recess for the govenor...can someone provide info on this for me?
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That is correct
Quote:
Originally Posted by Mr Charles
how to retrofit...ideas?
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Use a stainless steel dog bowl, get one with as wide a flange as possible to give room to rivet it in. Cherrymax rivets might be your best bet.
Pete
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04-22-2012, 05:30 PM
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Join Date: Dec 2005
Posts: 83
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Ditto on the SS bowl, seen it done, and it looks nice. Minimal air gap seams compared to building a box from a SS sheet.
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04-22-2012, 06:31 PM
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Join Date: Apr 2010
Location: Near Springfield, MO
Posts: 120
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Recess followup
Great idea on dog bowl! But however I build or install recess, what about rudder pedal travel interference on the inside? Won't any recess protrude into my rudder pedal area?
Charles
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04-22-2012, 06:45 PM
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JOAT-MON & Moderator
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Join Date: Apr 2005
Location: Vincent, Ohio
Posts: 737
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That 'someone' was me  . When I read your earlier post about wanting to convert to C/S I kinda' thought that you may have overlooked this since you weren't the builder.
Adding the recess is not difficult. As mentioned, best to remove the engine but that doesn't take long either. If you are going to use the dog food bowl you may as well just fab up the recess per the plans...either way works fine. I've never seen an issue with the rudder pedals so I wouldn't expect any with your installation.
Instead of asking for pics may I suggest you post a pic of your install, this might speed up your responses....the future recess area would be a good place to start.
Good Luck!
Quote:
Originally Posted by Mr Charles
I purchased a 4 built in 93 and am trying to convert from FP to a CS...someone mentioned older 4's didn't have a firewall recess for the govenor...can someone provide info on this for me? Pics of the recess...how to retrofit...ideas? I have a PCU 5000 located, which I understand is a fairly small govenor...will it work without firewall modification? Also, I am concerned because I have a Christianson inverted oil system, and think I may have a lot of stuff "in the way" for govenor installlation...anyone have this combination on a completed 4 ?
Thanks!
Charles
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04-23-2012, 03:40 AM
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Join Date: May 2009
Location: Colorado
Posts: 302
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Just wondering how familiar you are with your engine and install. Some engines have the governor mounted on the front of the engine. Obviously if that were the case no recess would be required.
Ryan
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04-23-2012, 12:06 PM
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Join Date: Oct 2006
Location: Seattle, wa
Posts: 679
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Dog food bowl will not work on the -4. If you look at the firewal you will see it has a step where your feet go. The middle of the step is where the cutout needs to be......
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04-24-2012, 01:14 AM
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Join Date: Aug 2009
Location: Switzerland
Posts: 178
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that's how our firewall recess looks like
Charles,
That's how our firewall recess looks like. The previous builder planned to install a O-320 with a constant speed prop and governor. Presently we do not use it, because we go the fixed pitch route. Notice that it's not completely symmetrical.

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RV-4 SN2416 in slow progress
Switzerland
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04-24-2012, 01:09 PM
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Join Date: Apr 2010
Location: Near Springfield, MO
Posts: 120
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Quote:
Originally Posted by Clouddancer
Charles,
That's how our firewall recess looks like. The previous builder planned to install a O-320 with a constant speed prop and governor. Presently we do not use it, because we go the fixed pitch route. Notice that it's not completely symmetrical.

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Thanks everyone...yes, I am somewhat familiar with engine/govenor setup...I have the pad on rear accessory case...right side, opposite fuel pump. The govenor I have is a PCU 5000, from an O -540 where it was mounted upper left front of cylinders...my understanding is same govenor for either location. The PCU is smaller than most other govenor choices...but assume by comments that I will still need to build the recess? This may all be a moot point as I am questioning whether I have a hollow crank (posted questions other threads)...but if I do have, will go ahead with swap!
Charles
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