REFLECTOR: Franklin Magneto/inspection/priming questions

Mon Aug 3 12:03:04 CDT 2009

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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