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  #1  
Old 02-20-2021, 06:49 AM
buchaneer buchaneer is online now
 
Join Date: Jun 2014
Location: Washington Tyne & Wear England.
Posts: 33
Default Firewall penetrations

Looking for an up to date diagram for firewall penetrations and/or advice for cutting holes for my set -up.
New IO 320 Lycoming
Sensenich FP metal prop
New style tricycle engine mount
Wondering where to place the b/head fitting for FI fuel supply and whether Vans drawing positions are current for new engine mount with regards to pipe, cable and heater box penetrations.
Want to do as many penetrations as possible prior to mounting engine mount for obvious access reasons

Duncan
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Duncan Kenworthy
QB RV-9A Tip-up (has become slowbuild !!)
Tail feathers and wings done apart from glasswork! Working on the rest!
Reg number reserved: G-RVSK
Donation made for 2020
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  #2  
Old 02-20-2021, 09:26 PM
622BH 622BH is offline
 
Join Date: Nov 2011
Location: Albany, OR
Posts: 170
Default Think to the Future

Once upon a time...
I used the Van's designated firewall pass-throughs. For the Lycoming provided Fuel Injection system they worked well.
Though I toyed with the idea of FlyEFII fuel injection system during the build, I went with the factory provided system. Well, at 75 hours and much frustration with the ancient IO technology I ripped it out. BUT, that mandated some new holes being punched through the firewall to accept the required fuel return lines to the newly required Andair Duplex Valve and installation of the return lines from that to the tanks.
Now, after 200+ hours on the old FlyEFII system, I upgraded to their new System 32, which required new penetrations in the firewall...
See where this can go? IF you absolutely KNOW you will never upgrade, the stock penetrations will work for you. But think very seriously about possible upgrades to systems and you'll be better prepared for the possibility / probability of needing "more holes." But you won't know where to put them until you get to that upgrade.
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  #3  
Old 02-21-2021, 08:56 AM
9GT's Avatar
9GT 9GT is offline
 
Join Date: Jan 2010
Location: Southern Michigan
Posts: 2,074
Default

Here is what I did: Made a template of the firewall and used that to cut out a sheet of OSB and transferred the engine mount locations. Mounted the engine and mount to it hanging from my engine hoist. I had to replace the IP supports the original builder buggered up so I used those and mounted to the aft side of the OSB and mounted my IP to that. Some of the Vans locations worked well but others did not, so I was able to drill holes in the OSB and route, then test the control cables. When I was satisfied of the FW penetration locations, I disassembled and transferred the locations to the actual firewall.
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David C.
Howell, MI
RV-10: #41686 Under Construction
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2020
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  #4  
Old 02-21-2021, 10:05 AM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,183
Default Firewall

I'm working FWF on my 7A slider with new gear and mount. There may be similarities so here's what I've found so far specific to the new gear on the 7A.
1. There are a couple revised drawings. Call and ask if you don't have them.
2. The throttle cable pass through is in a different location. It's at the bottom of the recess.
3. Cowl attach at the bottom is a little different. It's shown on the drawing.
4. These are a few parts specific to the new gear. Ask Vans.

Not specific to the gear.
1. The fuel line penetration has a doubler that ends up under one of the contactors. I fabricated a larger doubler.
2. I chose the larger RV10 oil cooler and mount and firewall mounted it on the Port side. It does require the prop governor cable penetration to be moved about 1" to the Port side to clear the duct. Might need a slightly longer cable. I haven't got that far. It will be fed from a blast gate on the #4 baffle and controlled by a cable. Haven't made that hole either.
3. I chose a stainless cabin heat control. It also require the cable pass through. Haven't done that either.
4. I'm using eyeball style penetrations for the three main controls.
5. Im using these for the smaller Bowden cables.
https://drive.google.com/open?id=1nQ...zv_Sdmsxk20Xy1
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #5  
Old 02-21-2021, 03:04 PM
buchaneer buchaneer is online now
 
Join Date: Jun 2014
Location: Washington Tyne & Wear England.
Posts: 33
Default Firewall penetrations

Cheers thanks for the replies, food for thought.

Larry :-
Thanks for all those pointers will check them out.
One thing as I am going for FI and an Andair pump I was planning on putting the fuel supply bulkhead fitting through the redundant Vans fuel pump doubler plate. Would that position work?
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Duncan Kenworthy
QB RV-9A Tip-up (has become slowbuild !!)
Tail feathers and wings done apart from glasswork! Working on the rest!
Reg number reserved: G-RVSK
Donation made for 2020
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  #6  
Old 02-21-2021, 05:51 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,183
Default Fuel line

Quote:
Originally Posted by buchaneer View Post
Cheers thanks for the replies, food for thought.

Larry :-
Thanks for all those pointers will check them out.
One thing as I am going for FI and an Andair pump I was planning on putting the fuel supply bulkhead fitting through the redundant Vans fuel pump doubler plate. Would that position work?
Check your plans. On the 7A the fuel pump doubler is not of any use because the electric fuel pump is in the tunnel.
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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  #7  
Old 02-21-2021, 05:59 PM
Desert Rat Desert Rat is offline
 
Join Date: Aug 2018
Location: 50-50 Wichita KS & Scottsdale AZ
Posts: 481
Default

Hey Wirejock. That link to home made firewall passthroughs for bowden cables is pure gold. Thanks for sharing that.
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AGI, CFI, CFII, MEI, A&P, Janitor
RV7 Empennage & Wing done
Fuselage in process
#72651
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  #8  
Old Yesterday, 03:21 PM
buchaneer buchaneer is online now
 
Join Date: Jun 2014
Location: Washington Tyne & Wear England.
Posts: 33
Default Firewall penetrations & new engine mount

Thanks to some pointers from Larry I have progressed making some of the penetrations. Battery box and contractors mounted but still have an issue where the other items for a IO 320 fuel injected engine are placed on my QB firewall. This is because all the drawings Vans gave me all seem to be for carburated engines, CS prop and tail dragger orientated.
A couple of questions:-
Is the given position for the heater control still current for FI?
I have a doubler plate and nut plates on the firewall for a fuel pump for a carburated engine. If I mount my fuel line bulkhead fitting through this will it be in a suitable position to connect easily to the engine fuel pump ( will be making my own hoses) I've picked up that the the other place stated clashes where I have mounted my solenoids.
Another problem I have is regarding my new engine mount with leg mod.
The QB fuselage came with the 4 corner mounting points drilled 1/4" and the new mount has 3/16" holes. As I don't have a lathe to make some stepped bolts to hold in position prior to drilling out holes how did others get the mount positioned properly prior to drilling out all the holes.
Like others have stated I am finding difficulty in sourcing FWF diagrams and info regarding engine mounting and peripherals.
Any info to make this phase simple appreciated as I an not keen in opening my my engine crate yet as it won't be fitted for a while.
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Duncan Kenworthy
QB RV-9A Tip-up (has become slowbuild !!)
Tail feathers and wings done apart from glasswork! Working on the rest!
Reg number reserved: G-RVSK
Donation made for 2020
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  #9  
Old Yesterday, 04:01 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,183
Default Firewall Forward

Quote:
Originally Posted by buchaneer View Post
Thanks to some pointers from Larry I have progressed making some of the penetrations. Battery box and contractors mounted but still have an issue where the other items for a IO 320 fuel injected engine are placed on my QB firewall. This is because all the drawings Vans gave me all seem to be for carburated engines, CS prop and tail dragger orientated.
A couple of questions:-
Is the given position for the heater control still current for FI?
I have a doubler plate and nut plates on the firewall for a fuel pump for a carburated engine. If I mount my fuel line bulkhead fitting through this will it be in a suitable position to connect easily to the engine fuel pump ( will be making my own hoses) I've picked up that the the other place stated clashes where I have mounted my solenoids.
Another problem I have is regarding my new engine mount with leg mod.
The QB fuselage came with the 4 corner mounting points drilled 1/4" and the new mount has 3/16" holes. As I don't have a lathe to make some stepped bolts to hold in position prior to drilling out holes how did others get the mount positioned properly prior to drilling out all the holes.
Like others have stated I am finding difficulty in sourcing FWF diagrams and info regarding engine mounting and peripherals.
Any info to make this phase simple appreciated as I an not keen in opening my my engine crate yet as it won't be fitted for a while.
The plans are there. Look carefully at the legends and notes. It's pretty confusing.
Heater control was fine for my IO360M1B. Just under the recess. Scat is angled Starboard. I bought a stainless heater box and Turbo Heat Muff but they are basically the same except my box control is on the FWF side.
I would stick with the Vans location for the fuel line. It puts the line in the right place for the pump. The conflict is easily managed with a new doubler. Check my blog. It worked out perfectly and both contactors fit where Vans intended.
The engine mount issue might be solved using drill bushings. Either make four or buy them from McMaster. 1/4" OD x 3/16" ID. Insert into the firewall holes. Insert 3/16" bolts into three. Add nuts and tighten so it can't move.
Drill the fourth from inside. Insert 1/4" bolt and tighten a nut. Repeat for each till all four are done.
You're using the new gear, check the hole location for the throttle. It moved to the recess.
__________________
Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.

Last edited by wirejock : Yesterday at 05:21 PM.
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  #10  
Old Yesterday, 05:15 PM
wirejock's Avatar
wirejock wirejock is offline
 
Join Date: Oct 2005
Location: Estes Park, CO
Posts: 4,183
Default Photo

Duncan
Mine is a 7A, IO360M1B with the new mount and gear.
Maybe this photo will help.
Click image for larger version

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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 01/01/2021, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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