 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
BobbyPaulk(at)comcast.net
Guest
|
 Posted: Sat Apr 18, 2015 2:46 pm Post subject: Fuel Pressure |
 |
|
List
Today was the first flight on the Jabiru 3300 since my off field landing back in December ( due to both ignition coils being wiped out ).
I noticed the fuel pressure had dropped from 1.8 ~ 2.1 to 1.4 plus or minus. I have my low pressure alarm set at 1.8 so I kept getting an alarm unless I kept the electric boost pump on.
The engine has not been run since the first of December 2014. Question: Should I be concerned about the 1/2 lb. pressure drop or is it a case of TMI ( too much information ).
I know of at least two guys that do not even have a fuel pressure gauge.
Anyone have any idea how long the engine driven fuel pump is good for. It has 236 hours on it but it is at least 8 years old.
By the way I noticed my maximum RPM on take off went from 2600 to 2720 just before rotation speed. I attribute that to the new Rotek E-mag and the newer Honda ignition coil.
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 236 hrs.
Do Not Archive
[quote][b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
|
|
| Back to top |
|
 |
zeprep251(at)aol.com
Guest
|
| Posted: Sat Apr 18, 2015 5:11 pm Post subject: Fuel Pressure |
|
|
Have 930 hrs on original pump, no pressure gauge, but turning 3100 on take off.
Sent from my iPhone
On Apr 18, 2015, at 6:43 PM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote:
[quote]List
Today was the first flight on the Jabiru 3300 since my off field landing back in December ( due to both ignition coils being wiped out ).
I noticed the fuel pressure had dropped from 1.8 ~ 2.1 to 1.4 plus or minus. I have my low pressure alarm set at 1.8 so I kept getting an alarm unless I kept the electric boost pump on.
The engine has not been run since the first of December 2014. Question: Should I be concerned about the 1/2 lb. pressure drop or is it a case of TMI ( too much information ).
I know of at least two guys that do not even have a fuel pressure gauge.
Anyone have any idea how long the engine driven fuel pump is good for. It has 236 hours on it but it is at least 8 years old.
By the way I noticed my maximum RPM on take off went from 2600 to 2720 just before rotation speed. I attribute that to the new Rotek E-mag and the newer Honda ignition coil.
Bobby ( age 76 )
Zodiac 601 XL "B"
Jabiru 3300 S/N 1141
Sensenich 64" x 51" Prop
Bing Carb 260 Main & 290 Needle Jet
Status - Flying 236 hrs.
Do Not Archive
| Quote: |
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
uEngine-List"">http://www.matronics.com/Navigator?JabiruEngine-List
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
//forums.matronics.com
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
ot;">http://www.matronics.com/contribution
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
|
[b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
|
|
| Back to top |
|
|
DaveG601XL
Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh
|
| Posted: Fri Apr 24, 2015 8:41 am Post subject: Re: Fuel Pressure |
|
|
Bobby,
For what it's worth, my fuel pressure varies from 1.5 to 3.5 PSIA on my Dynon EMS charts. This includes both electric pump on and off. There is a lot of variation, likely from the 40 psi transducer trying to read in the extreme low of its range. My low fuel pressure limit is set at 1.5 PSIA so it rarely chirps. I would think that a sudden step change is something to look into, but if my limit was set at 1.8 PSIA, the alarm would be going off all the time.
Dave
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
_________________
David Gallagher
Cincinnati, OH area |
|
| Back to top |
|
|
BARRY CHECK 6
Joined: 15 Mar 2011
Posts: 738
|
| Posted: Fri Apr 24, 2015 5:32 pm Post subject: Fuel Pressure |
|
|
Are you sure it is PSIA?
Pressures you would read would be in PSIG!
So if you are really reading PSIA you are way too low... About 13.2 PSI low.
Barry
On Fri, Apr 24, 2015 at 12:41 PM, DaveG601XL <david.m.gallagher(at)ge.com (david.m.gallagher(at)ge.com)> wrote:
[quote]--> JabiruEngine-List message posted by: "DaveG601XL" <david.m.gallagher(at)ge.com (david.m.gallagher(at)ge.com)>
Bobby,
For what it's worth, my fuel pressure varies from 1.5 to 3.5 PSIA on my Dynon EMS charts. This includes both electric pump on and off. There is a lot of variation, likely from the 40 psi transducer trying to read in the extreme low of its range. My low fuel pressure limit is set at 1.5 PSIA so it rarely chirps. I would think that a sudden step change is something to look into, but if my limit was set at 1.8 PSIA, the alarm would be going off all the time.
Dave
--------
David Gallagher
Zodiac 601 XL-B: flying, 280+ hours now
Next project under construction: Finish my father's Aircamper
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=441231#441231
===========
ne-List" target="_blank">http://www.matronics.com/Navigator?JabiruEngine-List
===========
">http://forums.matronics.com
===========
le, List Admin.
="_blank">http://www.matronics.com/contribution
===========
[b]
| | - The Matronics JabiruEngine-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?JabiruEngine-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
