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09-24-2012, 08:53 PM
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Join Date: Jun 2007
Location: Fairbanks AK
Posts: 758
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Red Cube mouting possible issue
So I mounted the cube today, it is located just after the mechanical fuel pump before it gets to the silverhawk fuel injection servo. I was pleased with the way it turned out until a buddy of mine pointed out that fuel lines are mounted to the motor and the cube is mounted to the motor mount. Is this correct that the cube/fittings will be prone to cracking due to engine vibrations on the mounts when it it is fixed solid to a non moving piece?
-david
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RV-7 N87DX Built, Flown, and Sold!
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09-24-2012, 09:06 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Yep he's correct, especially with the short looking hose you have from the pump.
It's also generally recommended the the xdcr be located between the servo and the distribution manifold.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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09-24-2012, 09:11 PM
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Join Date: Jun 2007
Location: Fairbanks AK
Posts: 758
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I tried to find a way to put it between those 2 however with the setup I have there just is no room to get it in there with the mounting requirements. I spoke with the EI Guys today and he said there should be no problem putting it where I did. I guess I will ahve to come up with a new mounting solution. Back to the drawing board.
-david
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RV-7 N87DX Built, Flown, and Sold!
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09-24-2012, 09:12 PM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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I am going to concur with Walt - those lines just look way to short to me, and they are oriented such that when the engine moves, the end fittings will be pulled on with every cycle - that is a great way to have a fuel leak/fire. I'll be honest - that installation looks scary to me.
Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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09-24-2012, 09:19 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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One other thing, you do not want your fuel lines to go up hill and then back down hill, allowing a place for water and "gunk" to collect.
This may be more important in a carbureted engine but it is still a good practice.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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09-24-2012, 10:50 PM
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Join Date: Oct 2007
Location: Mission Viejo, CA
Posts: 212
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09-24-2012, 11:37 PM
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Join Date: Jun 2010
Location: Portland, OR
Posts: 337
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Hose sealant?
David, are you using RTV as a sealant for your hose/AN fitting connections? I see some on the hose side of your connections and I didn't think this is a place where any sealant is used. Just curious as I'm working on my FWF.
-David H
Quote:
Originally Posted by Flyguytki
So I mounted the cube today, it is located just after the mechanical fuel pump before it gets to the silverhawk fuel injection servo. I was pleased with the way it turned out until a buddy of mine pointed out that fuel lines are mounted to the motor and the cube is mounted to the motor mount. Is this correct that the cube/fittings will be prone to cracking due to engine vibrations on the mounts when it it is fixed solid to a non moving piece?
-david
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David Halmos
RV-10
Flying - 570+ hours
Portland, OR
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09-25-2012, 05:42 AM
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Join Date: Jun 2007
Location: Fairbanks AK
Posts: 758
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Quote:
Originally Posted by dhmoose
David, are you using RTV as a sealant for your hose/AN fitting connections? I see some on the hose side of your connections and I didn't think this is a place where any sealant is used. Just curious as I'm working on my FWF.
-David H
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David, The Red RTV was used to seal underneath the firesleeve before the hose clamp went on. It is not being used as a thread sealant.
-david
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RV-7 N87DX Built, Flown, and Sold!
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09-25-2012, 07:06 AM
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Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
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I would not recommend mounting to the engine... It will work for a while, but the vibration will reduce its service life. I suspect the best place is still in between the gascolator on the firewall and the engine driven pump. You'll get a momentary reading of higher flow when using the boost pump with the cube in that location, but it doesn't seem to affect the accuracy of the fuel totalizing due to the short duty cycle of the boost pump.
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Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
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09-25-2012, 07:45 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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Quote:
Originally Posted by Snowflake
I would not recommend mounting to the engine... It will work for a while, but the vibration will reduce its service life. I suspect the best place is still in between the gascolator on the firewall and the engine driven pump. You'll get a momentary reading of higher flow when using the boost pump with the cube in that location, but it doesn't seem to affect the accuracy of the fuel totalizing due to the short duty cycle of the boost pump.
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This was correct in years back Rob, but I talked directly with the engineering folks that make the red cube when we were mounting ours on Tsam last year, and the design has changed - vibration due to engine mounting is no longer an issue according to them.
Paul
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Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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