REFLECTOR: Franklin Fuel Pump Issues

[Wayne Owens]

That number makes me doubt my memory. Airborne's Tech Service hotline # is:
800 382 8422
Air leaks sound like a good thing to investigate also.
----- Original Message -----
From: "Jay Yu" <jayyu@arczip.com>
To: <reflector@tvbf.org>
Sent: Sunday, April 27, 2003 11:34 PM
Subject: RE: REFLECTOR: Franklin Fuel Pump Issues


> Hi Wayne,
>
> Thanks for the input. Based on the Franklin manual, the accessary drive
pad
> on which I installed the vacuum pump has a drive ratio of 0.847 which is
> certainly less than 2 1/2. I wonder what vacuum other builders with the
same
> configuration are getting.
>
> Thanks,
>
> Jay
>
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Wayne Owens
> Sent: Sunday, April 27, 2003 9:59 PM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR: Franklin Fuel Pump Issues
>
>
> Seems like the Airborne customer service folks told me that pump RPM
should
> be 2 1/2 x crank rpm. Verify that. Can you crank your prop over by hand
and
> count pump revolutions to determine what ratio you are driving it at?
> Wayne
> ----- Original Message -----
> From: "Jay Yu" <jayyu@arczip.com>
> To: <reflector@tvbf.org>; "mike deeter" <iguanamagic@yahoo.com>
> Sent: Sunday, April 27, 2003 10:42 PM
> Subject: RE: REFLECTOR: Franklin Fuel Pump Issues
>
>
> > Hi Mike and All Franklin Drivers,
> >
> > I know that I am late in the game on this. I just installed my new fuel
> pump
> > that's working well. But, like Mike's original configuration, my
SigmaTek
> > vacuum pump used to be on fuel pump drive and now has been moved to rear
> > pilot side. When I started the engine, I didn't get any vacuum at idle
> > speed. I only got about 3" HG when the engine was running 1800RPM. The
> GREEN
> > arc is about 4.5" to 5.5" HG. How much vacuum can you get and at what
RPM
> > (Mike?) What's the lowest vacuum we need for safe flight?
> >
> > My vacuum pump did have about 80 hours in original configuration. In
that
> > configuration, the vacuum was in GREEN easily (may be a little over 1000
> > RPM). With this new installation, I adjusted the vacuum regulator (both
> ways
> > to extreme) but still cann't get more than 3" at about 1800 RPM.
> >
> > Any and all hints will be greatly appreciated.
> >
> > Jay Yu
> > N86YU
> > Velocity RGE
> > Franklin/MT
> >
> >
> >
> > -----Original Message-----
> > From: owner-reflector@dax.awpi.com
> > [mailto:owner-reflector@dax.awpi.com]On Behalf Of mike deeter
> > Sent: Friday, November 01, 2002 12:17 PM
> > To: reflector@tvbf.org
> > Subject: Re: REFLECTOR: Franklin Fuel Pump Issues
> >
> >
> > Franklin drivers:
> >
> > OK , so now I'm answering my own emails.
> >
> > I just got off the phone w/ my engine builder, Pete
> > Askeland at Franklin Aircraft Engines, Inc. (FAEI) in
> > Colorado.
> >
> > Referring to the problems I've outlined in my email
> > below.  If you have a bidirectional vacuum pump you
> > will have no problem; just switch the input and output
> > lines.
> >
> > If you don't have a bidirectional pump you will
> > obviously have to get a new vacuum pump.
> >
> > As for the speed of the accessory pad:  FAEI has the
> > STC for Cessnas w/ Franklins and they run their vacuum
> > pumps off the accessory pad in question, i.e. no
> > problem running vacuum off the pad on the pilot side
> > near the prop.
> >
> > Sorry to get us all excited.
> >
> > Mike
> >
> > --- mike deeter <iguanamagic@yahoo.com> wrote:
> > > Franklin drivers:
> > >
> > > Well, I got my fuel pump installed and fuel lines
> > > redone.  I only needed to hoist the engine for
> > > taking
> > > the old one off.  I was able to reinstall the new
> > > one
> > > w/ the engine bolted tightly to the firewall.
> > >
> > > I installed the vacuum pump on the pilot side accy
> > > pad
> > > near the prop.  Unfortunately, this may not work as
> > > well as PZL intended.  Larry Coen pointed out the
> > > accy
> > > pads near the prop turn 0.847 times crank CW while
> > > the
> > > accy pad on the rear of the engine (fuel pump mount)
> > > turns 1.65 times crank CCW.
> > >
> > > This could be a problems (ahem, issue).
> > >
> > > The vacuum pump will now turn more slowly and
> > > opposite
> > > the way it previously turned (it previously was on
> > > the
> > > fuel pump drive).  I called SigmaTek about this and
> > > they said, though the pump is bi-directional, the
> > > direction change is significant because it gets a
> > > wear
> > > pattern after awhile and changing could shorten the
> > > life.  I only have 12 hours on mine so they said it
> > > should be OK.  The other problem is they said their
> > > pump needs about 1500 RPM to get good vacuum (gauge
> > > in
> > > the green) so at 0.847:1 I'd need around 1800 crank
> > > RPM to get good vacuum.  Hmmm.
> > >
> > > The SigmaTek guy did say that other pumps on the
> > > market only need 1200 RPM to get up to speed so only
> > > would need around 1400 crank RPM to get good vacuum.
> > >
> > > Still not the best situation.
> > >
> > > I hope to get some comments from the Franklin guys
> > > to
> > > see what ideas are out there for solving this
> > > problem.
> > >  Can't go running around w/o vacuum.
> > >
> > > Sorry to be the bearer of bad tidings.
> > >
> > > Mike Deeter
> > > N2011P Franklin RG E
> > >
> > >
> > >
> > > =====
> > > *******************************************
> > > Mike Deeter
> > > N2011 Test Pilot
> > > iguanamagic@yahoo.com
> > > http://iguanamagic.siegesmund.org
> > > *******************************************
> > >
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> > =====
> > *******************************************
> > Mike Deeter
> > N2011 Test Pilot
> > iguanamagic@yahoo.com
> > http://iguanamagic.siegesmund.org
> > *******************************************
> >
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