VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-10
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 01-01-2009, 03:40 PM
Wayne's Avatar
Wayne Wayne is offline
 
Join Date: Jan 2005
Location: Rocky Mountain House, AB
Posts: 107
Default firewall placement of fuel return fitting

I plan on using a IO-540 with a purge valve and thus need a fuel return line back to a tank. Since I dont have the engine yet and unsure of firewall "clutter" I was wondering where to put the bulkhead fitting for the return fuel line? It would be nice to install this with the wide open spaces as I am doing the rest of the fuel system.

Thanks
__________________
Wayne
RV 7 "eh?" C-GOYA - 420 hrs
RV 10 C-GOOH - 350 hrs
R44 160 hrs
grounded by stroke Sept 3/07 - and back flying Feb 2010. Don"t ever take flying for granted !
Reply With Quote
  #2  
Old 01-02-2009, 12:08 AM
Deems Davis Deems Davis is offline
 
Join Date: Jun 2006
Location: Anthem, Az
Posts: 168
Default Here's where I put mine

purge line coming from purge valve

http://deemsrv10.com/album/Sec%20FF4.../DSC04985.html

purge line as it enters the center tunnel (enroute back to fuel tank)

http://deemsrv10.com/album/Sec%20FF4.../DSC04988.html
__________________
Deems Davis
RV10 N519PJ
http://deemsrv10.com/index.html
Reply With Quote
  #3  
Old 01-02-2009, 10:03 AM
Wayne's Avatar
Wayne Wayne is offline
 
Join Date: Jan 2005
Location: Rocky Mountain House, AB
Posts: 107
Default thats what I needed

Thanks Deem - thats what I was looking for. I had actually gone to your site and couldnt find the pic I needed.

Have a great 09
__________________
Wayne
RV 7 "eh?" C-GOYA - 420 hrs
RV 10 C-GOOH - 350 hrs
R44 160 hrs
grounded by stroke Sept 3/07 - and back flying Feb 2010. Don"t ever take flying for granted !
Reply With Quote
  #4  
Old 01-02-2009, 11:23 AM
David Clifford David Clifford is offline
Banned
 
Join Date: Jun 2006
Location: Howell, MI
Posts: 220
Default

Can anyone tell me what the purge valve is for or does? When I plumbed the Cozy MKIV with a Superior XP IO-360, I did not use one and it starts and runs just fine. I am a ways off the decision point on my RV-10, but I do plan on using an IO-540 and would like to know if I should plan on using one.
Reply With Quote
  #5  
Old 01-02-2009, 11:47 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 13,622
Default

Quote:
Originally Posted by David Clifford View Post
Can anyone tell me what the purge valve is for or does?
Releases pressure from system at engine shutdown.

Acts as a backup engine kill.

Allows heat soaked fuel to be purged for easier hot starts.
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #6  
Old 01-02-2009, 12:39 PM
w1curtis's Avatar
w1curtis w1curtis is offline
 
Join Date: Jan 2005
Location: Eastern, PA
Posts: 828
Default

Quote:
Acts as a backup engine kill.
And sometimes act as a primary engine kill at the most inopportune time when not properly safety wired.
__________________
William Curtis
SB RV-10 40237, Status, Panel, Engine, Paint, Me, NE RV-10 Page, Cessna 177RG, AF Missions
“Be who you are and say what you feel because those who mind don't matter and those who matter don't mind.” - Dr. Suess
Reply With Quote
  #7  
Old 01-02-2009, 01:28 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 13,622
Default

Quote:
Originally Posted by w1curtis View Post
And sometimes act as a primary engine kill at the most inopportune time when not properly safety wired.
Yep, that was a big concern of mine.

I chose to use a different shaped/colored knob (handle?) for my purge control, and mount it slightly away from the primary engine controls.

http://aycu32.webshots.com/image/409...3100502_rs.jpg

Chrome "T" handle to the left of the black throttle knob.

It is also recessed a bit under the panel.
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #8  
Old 01-02-2009, 02:00 PM
DanH's Avatar
DanH DanH is online now
 
Join Date: Oct 2005
Location: 08A
Posts: 7,237
Default

A few notes:

The firewall bulkhead fitting should be steel, not aluminum.

Locating the fitting and its line someplace other than the lower firewall cooling air exit region is a plus...fire follows airflow.

Consider backflow. Many installs run the purge line directly to a tank, or to a fuel supply line somewhere inboard of a tank. If the hose burns off a purge line firewall fitting mounted below the tank fuel level, there is nothing to stop gravity flow of fuel into the fire. A purge line firewall penetration mounted at some reasonable height above the fuel supply is one answer (easy with an RV). The other approach is a check valve in the purge line somwhere behind the firewall.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #9  
Old 01-02-2009, 02:24 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 13,622
Default

Quote:
Originally Posted by DanH View Post
A few notes:

The firewall bulkhead fitting should be steel, not aluminum.

Locating the fitting and its line someplace other than the lower firewall cooling air exit region is a plus...fire follows airflow.

Consider backflow. Many installs run the purge line directly to a tank, or to a fuel supply line somewhere inboard of a tank. If the hose burns off a purge line firewall fitting mounted below the tank fuel level, there is nothing to stop gravity flow of fuel into the fire. A purge line firewall penetration mounted at some reasonable height above the fuel supply is one answer (easy with an RV). The other approach is a check valve in the purge line somwhere behind the firewall.
Dan, excellent observations.

Check valve ----- never thought of it.

I wonder if a high loop would do??
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #10  
Old 01-02-2009, 02:33 PM
frankh's Avatar
frankh frankh is offline
 
Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
Default I put mine up high

To avoid the gravity backflow if the line somehow broke off north of the firewall..Highly unlikely but as I had the option then why not.

Not sure what system your using but the 4 banger AFP system's purge valve is to th right of center line on top of the engine.
I basically came straight back, thru the rear baffle so my firewall hole is up high in board of the upper right engine engine mount.

Steel bulkhead fittings are available for cheap from your local hydraulics shoppe.

Frank
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 07:12 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.