Today's Message Index:
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1. 07:05 AM - JPI 800 & manifold pressure (Weir, Douglas (CALYON))
2. 09:33 AM - Re: Manifold pressure (teamgrumman@AOL.COM)
Message 1
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| Subject: | JPI 800 & manifold pressure |
I have a JPI 800, and recently I have noticed the manifold pressure will
become highly erratic after maybe 30 minutes of flight time. It is somewhat
intermittent, and does not always demonstrate the same behavior.
I have looked at the hardware and do not see any obvious loose fittings - do
you have any suggestions of how to go about trouble-shooting, and what the
likely culprit might be?
Also, I recently had a bird strike which will require replacement of the
vertical stabilizer - other than Fletcher, are there other reliable sources
of replacement parts for my Tiger (it's a '79)?
Thanks,
Doug
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'>I have a JPI 800, and recently I have noticed the manifo
ld
pressure will become highly erratic after maybe 30 minutes of flight
time. It is somewhat intermittent, and does not always demonstrate the
same behavior.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'>I have looked at the hardware and do not see any obvious
loose fittings - do you have any suggestions of how to go about
trouble-shooting, and what the likely culprit might be?<o:p></o:p></span></
font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'>Also, I recently had a bird strike which will require
replacement of the vertical stabilizer - other than Fletcher, are there
other reliable sources of replacement parts for my Tiger (it's a '79)?<o:p>
</o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:1
0.0pt;
font-family:Arial'>Doug<o:p></o:p></span></font></p>
</div>
<FONT SIZE=3><BR>
<BR>
*** Calyon **************************************************** <BR>
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otify the sender and then destroy the message. The unauthorized disclosure
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r any information it contains, is prohibited. E-mails are susceptible to al
teration and their integrity cannot be guaranteed. As this message and/or
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served. <BR>
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Message 2
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| Subject: | Re: Manifold pressure |
--> TeamGrumman-List message posted by: teamgrumman@aol.com
Well, based on how long the FAA is taking with the cowling .... TBD. I
wish you lived closer.
-----Original Message-----
From: 923te@cox.net
Sent: Sun, 29 Oct 2006 11:43 AM
Subject: Re: TeamGrumman-List: Manifold pressure
--> TeamGrumman-List message posted by: "923te" <923te@cox.net>
I have one...how long do yu need it for?
----- Original Message -----
From: <teamgrumman@aol.com>
Sent: Sunday, October 29, 2006 12:23 PM
Subject: Re: TeamGrumman-List: Manifold pressure
--> TeamGrumman-List message posted by: teamgrumman@aol.com
I need a test AG5B to create an STC for a diffferent inlet. The same
(stupid) air filter and airbox will be used.
-----Original Message-----
From: teamgrumman@aol.com
Sent: Sun, 29 Oct 2006 10:15 AM
Subject: Re: TeamGrumman-List: Manifold pressure
--> TeamGrumman-List message posted by: teamgrumman@aol.com
I thought I made it clear that both planes have a JPI 800. Same
instrumentation. Same transducers. The pressure is being measured from
the fuel injection port on the #3 cylinder on both planes. The length
of tubing to the MAP transducer is the same.
-----Original Message-----
From: FLYaDIVE@aol.com
To: teamgrumman-list@matronics.com
Sent: Sun, 29 Oct 2006 3:43 AM
Subject: Re: TeamGrumman-List: Manifold pressure
In a message dated 10/29/2006 3:24:02 AM Eastern Standard Time,
teamgrumman@aol.com writes:
--> TeamGrumman-List message posted by: teamgrumman@aol.com
Did an interesting test today.
2004 Tiger with a JPI 800. With Manifold Pressure.
My TIger, 1987 Tiger with a JPI 800.
Engine not running: both indicate the same manifold pressure
During a climb at WOT (wide open throttle) from 4000 ft to 6500 feet,
manifold pressure in the 2004 was 1/2 inch less.
Straight and level, WOT, MAP in the '04 Tiger was 7/10 inches less.
I've thought for a long time that the design of the carb air inlet on
the AG5B was stupid. Now I'm convinced.
________________________________________________________________________
===============================================
Gary:
Where is the manifold pressure being taken from for each gage?
What I'm thinking is: Since we know the poor configuration and fuel
distribution that the intake manifold offers, could it be this, that is
showing the difference between your gages.
Then again they are only gages. Made by different manufactures and I
believe the JPI uses a transducer while the planes gage is a Boron(sp)
Tube. Lots of mechanical differences their also. There is also the
scales range to consider. What is the advertised accuracy of the each
of the gages? Are the reading differences between the gages within
that accuracy range?
GAUD! I hate being so QA Analytical.
Barry
"Chop'd Liver"
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