REFLECTOR: Franklin Magneto/inspection/priming questions

John Dibble aminetech at bluefrog.com
Mon Aug 3 19:40:20 CDT 2009 

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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