REFLECTOR: Franklin Magneto/inspection/priming questions
Laurence Coen
lwcoen at hotmail.com
Tue Aug 4 12:00:27 CDT 2009
John,
Sorry about getting short with you but if you blow yourself up, who am I
going to harass then? In answer to your question, nothing. In fact when I
first started the engine, I primed for about three seconds and got
underneath and sniffed the intake and couldn't smell gas. When I cranked
the engine it fired immediately. It would seem to me that you are dumping
way too much fuel into the manifold when you prime. You might try a short
squirt and wait a minute for vaporization and then crank. Just be careful.
Larry Coen
N136LC
--------------------------------------------------
From: "John Dibble" <aminetech at bluefrog.com>
Sent: Tuesday, August 04, 2009 7:50 AM
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: Franklin Magneto/inspection/priming questions
> Sorry, Larry, I'm not ignoring your advice and will check if I have the
> spray nozzle
> and if not, look into installing one. This will take time and given that
> I have 700
> hours without incident and know how to avoid fuel flowing out the
> induction, I have
> other higher priorities to address first. That said, it seems like
> priming while the
> engine is already turning would be an even safer, if not failsafe,
> procedure that I can
> use immediately. Since this procedure is not normal, I wanted to solicit
> comments from
> the wealth of knowledge on the reflector.
> I prefer to think of my self as difficult, but not impossible, to help. I
> am curious
> to know what you see on the ground below your air intake after priming for
> 5 seconds
> without turning the engine.
>
> John
>
>
>
> Laurence Coen wrote:
>
>> John,
>>
>> I tried to help you, Mike Watson tried to help you but now I think you
>> are
>> beyond help.
>>
>> Larry
>>
>> --------------------------------------------------
>> From: "John Dibble" <aminetech at bluefrog.com>
>> Sent: Monday, August 03, 2009 7:40 PM
>> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>> Subject: Re: REFLECTOR: Franklin Magneto/inspection/priming questions
>>
>> > I think I might try using the primer while the engine is cranking,
>> > unless
>> > there is a
>> > reason not to.
>> >
>> > John
>> >
>> > Laurence Coen wrote:
>> >
>> >> John,
>> >>
>> >> I've never had a no-start. Your description of raw gas flowing out
>> >> the
>> >> induction would indicate to me that your primer has no nozzle and
>> >> dumps a
>> >> solid stream of fuel into the manifold. There are two things wrong
>> >> with
>> >> that, if that is the case. First you will dump a lot of fuel in a
>> >> very
>> >> short time making it difficult to do it right. Second, liquid fuel
>> >> doesn't
>> >> burn but vapors do. A nozzle both meters the fuel and atomizes it
>> >> which
>> >> improves vaporization. If you have a 1/8" pipe fitting into the
>> >> manifold
>> >> with no nozzle then that is your problem, not location.
>> >>
>> >> Raw fuel running out of the induction system has been the cause of
>> >> quite
>> >> a
>> >> number of engine fires on start-up.
>> >>
>> >> Larry Coen
>> >> N136LC
>> >>
>> >> --------------------------------------------------
>> >> From: "John Dibble" <aminetech at bluefrog.com>
>> >> Sent: Sunday, August 02, 2009 10:55 AM
>> >> To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>> >> Subject: Re: REFLECTOR: Franklin Magneto/inspection/priming questions
>> >>
>> >> > Larry,
>> >> > I have a similar prime setup. Have you ever primed and not started?
>> >> > Mine
>> >> > is connected
>> >> > to the front primer port and the fuel will pour out the carb if I do
>> >> > not
>> >> > start
>> >> > imediately. I'm considering moving it to the middle or rear port,
>> >> > but
>> >> > want to know if
>> >> > it will do any good.
>> >> >
>> >> > John
>> >> >
>> >> > Laurence Coen wrote:
>> >> >
>> >> >> Jeff,
>> >> >>
>> >> >> I too have a Goodman engine that sat for about five years. It
>> >> >> sounds
>> >> >> like
>> >> >> you took good care of it while it was in storage so I don't think
>> >> >> you
>> >> >> need
>> >> >> to do much but put in fresh oil and fire it up. That is what I did
>> >> >> and
>> >> >> three years later it is running fine with compressions running
>> >> >> 79/80.
>> >> >>
>> >> >> Priming is something you will need. Priming by pumping the
>> >> >> throttle
>> >> >> with
>> >> >> an
>> >> >> updraft carb is an engine fire waiting to happen. There are primer
>> >> >> manifolds that mount on the bottom of the intake manifolds but
>> >> >> they're
>> >> >> pricey. I built my own primer system that works very well. I
>> >> >> pressurize
>> >> >> the fuel system with the electric pump and have a solenoid valve
>> >> >> that
>> >> >> is
>> >> >> operated with push button on the panel. I inject fuel into the
>> >> >> center
>> >> >> primer ports on both sides of the engine. I made my own injectors
>> >> >> from
>> >> >> 1/8"
>> >> >> flare to 1/8" pipe elbows. The injector nozzle is a brass screw
>> >> >> threaded
>> >> >> into the elbow and center drilled with a #60 drill. Two to five
>> >> >> seconds
>> >> >> prime, depending on temp, does the job.
>> >> >>
>> >> >> Larry Coen
>> >> >> N136LC
>> >> >> SE/RG Franklin/IVO
>> >> >>
>> >> >> --------------------------------------------------
>> >> >> From: "Jeff Clough" <jclough48 at comcast.net>
>> >> >> Sent: Thursday, July 30, 2009 8:23 AM
>> >> >> To: "Velocity Aircraft Owners and Builders list"
>> >> >> <reflector at tvbf.org>
>> >> >> Subject: REFLECTOR: Franklin Magneto/inspection/priming questions
>> >> >>
>> >> >> > FINALLY getting around to hooking up my Franklin engine to
>> >> >> > hopefully
>> >> >> > test fire it soon......a few questions:
>> >> >> > 1: I have Rose dual ignition....am planning on using 1/2 of
>> >> >> > this
>> >> >> > set
>> >> >> > up for one set of spark plugs and a magneto for the other set of
>> >> >> > plugs....what magneto are others using and where
>> >> >> > can I
>> >> >> > get
>> >> >> > one????
>> >> >> > 2: How did others route/support their ignition wires
>> >> >> > through/under
>> >> >> > the
>> >> >> > Franklin plenum....got any pictures you can send to me off
>> >> >> > Reflector
>> >> >> > ??
>> >> >> > 3: I purchased my engine new from Pat Goodman back in about 1997
>> >> >> > (I
>> >> >> > think).....He had test run it, but it has not been run since
>> >> >> > then.
>> >> >> > I
>> >> >> > removed the plugs and put oil in the cylinders
>> >> >> > several
>> >> >> > time
>> >> >> > over the ensuing years , the engine has been in a hangar here in
>> >> >> > DRY
>> >> >> > Colorado or in my heated garage in Alaska in the
>> >> >> > subsequent
>> >> >> > years....should it be inspected or have gaskets replaced etc????
>> >> >> > I
>> >> >> > think there are some Franklin pros in Ft Collins CO (about 1 hour
>> >> >> > away)...should I pull the engine off (again) and take it to
>> >> >> > them
>> >> >> > for inspection/servicing or should I run it for a while on my
>> >> >> > airframe
>> >> >> > (break it in on my airframe while on the
>> >> >> > ground
>> >> >> > and then (perhaps?) have it inspected/serviced ??
>> >> >> > 4: I currently DO NOT have a priming system......is it
>> >> >> > necessary
>> >> >> > to
>> >> >> > have one or will the engine start w/out it just by cranking a bit
>> >> >> > longer??? If I need a priming system , is there a
>> >> >> > packaged
>> >> >> > system available??
>> >> >> >
>> >> >> > Thanx for all your input(s) Jeff C Brighton CO
>> >> >> > 173RG
>> >> >> > Clamshell IVO Franklin
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>> >>
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>> >> >> 5/29/2009 6:28 AM
>> >> >
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>> >> Version: 8.0.175 / Virus Database: 270.12.45/2141 - Release Date:
>> >> 5/29/2009 6:28 AM
>> >
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>> Version: 8.0.175 / Virus Database: 270.12.45/2141 - Release Date:
>> 5/29/2009 6:28 AM
>
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