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  #1  
Old 04-22-2012, 08:08 AM
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Mr Charles Mr Charles is offline
 
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Default 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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  #2  
Old 04-22-2012, 08:35 AM
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N941WR N941WR is offline
 
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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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  #3  
Old 04-22-2012, 01:29 PM
penguin penguin is offline
 
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Quote:
Originally Posted by Mr Charles View Post
... someone mentioned older 4's didn't have a firewall recess for the govenor...can someone provide info on this for me?
That is correct

Quote:
Originally Posted by Mr Charles View Post
how to retrofit...ideas?
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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  #4  
Old 04-22-2012, 05:30 PM
rv4dude rv4dude is offline
 
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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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  #5  
Old 04-22-2012, 06:31 PM
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Mr Charles Mr Charles is offline
 
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Default 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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  #6  
Old 04-22-2012, 06:45 PM
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rv6rick rv6rick is offline
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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 View Post
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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  #7  
Old 04-23-2012, 03:40 AM
131RB 131RB is offline
 
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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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  #8  
Old 04-23-2012, 12:06 PM
asav8tor asav8tor is offline
 
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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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  #9  
Old 04-24-2012, 01:14 AM
Clouddancer Clouddancer is offline
 
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Default 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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  #10  
Old 04-24-2012, 01:09 PM
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Mr Charles Mr Charles is offline
 
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Quote:
Originally Posted by Clouddancer View Post
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.

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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