REFLECTOR: Franklin Fuel Pump Issues

[Donald Royer]

I haven't installed my vacuum regulator yet, but I am getting over six
inches at cruise. My pump has always been on the drive on the rear pilot's
side. I am going to have to get my vacuum regulator installed before I wear
out my instruments.

One thing that may be contributing to my good performance is that I have a
5/8" line running from the pump to the back of the panel. I used the large
line after talking to one of the early Franklin drivers who was having some
problems with low vacuum pressure. His problem turned out to be a leaking
line.

Don

----- Original Message -----
From: "Jay Yu" <jayyu@arczip.com>
To: <reflector@tvbf.org>; "mike deeter" <iguanamagic@yahoo.com>
Sent: Sunday, April 27, 2003 8:42 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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