REFLECTOR: Franklin Fuel Pump Issues

Tue, 29 Apr 2003 10:11:21 -0500

Jay,

I just did some research on the Sigma Tek pump and found that it is rated at
6 in Hg at 1500 to 4000 RPM.  At 1800 RPM engine speed the pump is turning
at a little over 1500 and should be capable of 6 in Hg.  When the pump was
mounted on the accessory case and the engine is running at rated speed (2800
RPM) the pump is turning well above maximum rated speed.  You should be
doing better than 3 in Hg.  Look for a leak or a kink in a hose.

Larry Coen
SE RG Franklin

----- Original Message -----
From: "Jay Yu" <jayyu@arczip.com>
To: <reflector@tvbf.org>
Sent: Sunday, April 27, 2003 10:34 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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