|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

06-14-2019, 08:48 AM
|
|
|
|
Join Date: Apr 2011
Location: Madison, AL
Posts: 15
|
|
Quote:
Originally Posted by elev666
I understand you?re concern about vibration breaking primer lines, ( had one break on my Skyhawk that had no engine monitoring to alert me to a lean cylinder) when I installed mine I put it right next to the gascolater since there is only fuel flow in the lines when power is applied to open the Solenoid , I put a vibration loop in the copper line before T?ing off to # 1 & 2 Cylinders
In your scenario you?re putting pressurize fuel up to the engine in a expensive limited life fuel line unnecessarily , my 2 cents , cheers
|
Good point. I think as long as I use flexible fuel line from a firewall mounted solenoid to an engine-mounted distribution manifold (see other post) it should minimize my vibration induced cracking concern. Thanks!
|

06-14-2019, 09:45 AM
|
 |
|
|
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
|
|
You really don't need a primer unless you live in Alaska.
__________________
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
|

06-14-2019, 02:13 PM
|
|
|
|
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
|
|
We do a different approach. Yes teflon hose from the solenoid to a tee at the center sump under the mechanical pump. Depending on how many cylinders are being primed, each side of the tee routes a stainless rigid tube to the primer nozzles or in the case of a 3rd cylinder, to another tee then to each cylinder. Mimics the Lycoming primer diagram.
WE have done the cylinder lines in teflon hose, but it gets pricey because the -2 nozzle fittings are custom made. Looks cool though.
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
|

06-14-2019, 07:06 PM
|
|
|
|
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,089
|
|
Quote:
Originally Posted by david_rv8a
thanks for the photo. I think I saw the same pic on Google. Q. Did you fabricate your own distribution block? I considered this approach also. thanks.
|
I did. The fitting used for the copper line are machine thread, not taper thread. I tapped the block, but I also pro-sealed them in for insurance.
If I were to do it again, I would probably just prime one cylinder.
I ended up changing the routing a bit and added a second clamp, I don't think I have a good picture though.
__________________
Colin P.
RV-6A #20603
Complete 5/10/19
PP SEL / A&P
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
|

06-20-2019, 11:38 AM
|
 |
|
|
Join Date: Jan 2005
Posts: 4,285
|
|
Quote:
Originally Posted by WingsOnWheels
If I were to do it again, I would probably just prime one cylinder.
|
That is what I was going to say, one jug is enough.
As far as no primer, that's an option. The punp throttle method is doable. HOWEVER don't over do it and WAIT.
- Pump throttle (accelerator pump blows raw fuel into carb throat)
- Raw fuel will drip down into your air box, so wait and let it evaproate.
- Optional pump while cranking.
- Don't over prime, 1 or 2 max. A back fire might set your plane aflame.
- Only needed when cold.
Down side of direct primer into jug it raw fuel removes oil film from cyclinder. With fuel pump on just a short hit of the prime button is needed.
__________________
George
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767
2020 Dues Paid
Last edited by gmcjetpilot : 06-25-2019 at 08:51 AM.
|

06-24-2019, 01:15 PM
|
 |
|
|
Join Date: Oct 2009
Location: Edson, Alberta, Canada
Posts: 483
|
|
Vans Primer position
I ran a short flex hose from Gascolator as per Vans plans.
I then installed a "T" and continued on to the engine pump with flex hose tested at 2500 PSI. All of which is protected from heat using fireflex.
To provide fuel to the solenoid simply attached it to the "T" and then ran primer 1/4" line with a vibration circle in it to the #1 and # 2 cyl.
In Canada it is good to have primer, although i would agree that you could use the pump in the MArvel Carb prior to a start. I did have a fire once with that method and it was easy to happen, this was in my C182.
Hope this helps sorry no pics, maybe later.
Dave C.
__________________
Dave Cobb
[color="Red"]=VAF=2019 Donation - and a bit extra for great work![/COLOR="blue"]
Empennage RV 7 - Tipper
Wings complete
Dynon installed and running
Fuse closer to completion, Canopy complete
AME reviewed and repaired O-320-Lyc installed
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 03:17 AM.
|