REFLECTOR: Franklin Fuel Pump Issues

Sun, 27 Apr 2003 21:40:00 -0600

Maybe its time for that "All Electric Panel"?

File that antiquated suck machine in the circular file?

Scott

Jay Yu wrote:
> 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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