Today's Message Index:
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1. 04:32 AM - exhaust screw tensions (Mervin Friesen)
2. 07:39 AM - Re: Eliminate Fuel Pumps on High Wing?? (ALAN BEYER)
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| Subject: | exhaust screw tensions |
Good Morning,
The Jab 2200 manual (issue 4) page 22 instructs us to check the exhaust
system, check exhaust screw tensions and gasket condition. I can't find any
values for the exhaust screw tension. Does anyone know that value or where I
can find it? How have you done this check?
Mervin Friesen
Jab 2200 #1768
HYPERLINK
"http://kleefeld.hsd.ca/mefriesen/"http://kleefeld.hsd.ca/mefriesen/HYPERLIN
K "http://kleefeld.hsd.ca/mefriesen/index.html"HYPERLINK
"http://mefriese.hsd.ca/"
5:41 PM
Message 2
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| Subject: | Re: Eliminate Fuel Pumps on High Wing?? |
Don,=0AI have an older 3300 (S/N 431) with 340 Hrs. in an HDS. Most of its
life I flew it with the stock float needle seat that came with my engine (
2.5 MM). With-in the last few weeks I removed the carb and installed a new
seat (1.5MM) which is ment for a system with a fuel pump. What this did i
s what Peter H. was talking about. It leaned out the the mixture at the hi
gher RPM settings due to fuel not leaking past the needle and also made for
a more consistant fuel flow. The EGT,s went up, so in my case a little l
arger Needle Jet might be in order such as a 2.86 or a 2.87. I also have a
265 Main Jet installed. As Andy S. has explaned the fuel pump will sort o
f self regulate the fuel pressure depending on the spring rate of the sprin
g in the fuel pump. That is why if you have a boost pump turned on the pre
ssure will stay the same as with-out it on. With the 2.5 seat I would see
about 2 GPH increase in fuel flow, and just a few tenths with the 1.5 seat
at idle when I turned on the boost pump. I don't know what size seat the
newer engines come with. You can get all the parts you need from http://ww
w.bingcarburetor.com/. If you are installing your engine in a high wing an
d don't have enough fuel flow (The seat could act as the main jet) there ar
e larger seats available from Bing. The seats they have are 1.5, 2.5, 3.7,
and 4.0. I think as in my case with the larger seat the engine came set-up
for the Jabiru Aircraft (High wing). It worked O.K. with the larger seat,
but a lot better with the smaller one. =0ASome people have posted in the p
ast about having a proplem with cold starting. When I did my first start
up 3 years ago I also had a problem with cold starts. My engine would star
t and then stop five or six times before it woud keep running. By this tim
e the battery was almost dead. I made a modification to the small jet in th
e bottom of the float bowl that supplies the Starting Carb (Choke). The si
ze of the jet in my carb was .029". I drilled mine out to .035" which fixe
d the starting issue for me.=0A=0AAL from Oshkosh=0A=0AOriginal Message ---
-=0AFrom: Peter Harris <peterjfharris@bigpond.com>=0ATo: jabiruengine-list@
matronics.com=0ASent: Saturday, October 20, 2007 4:36:23 PM=0ASubject: RE:
JabiruEngine-List: Eliminate Fuel Pumps on High Wing??=0A=0A=0ADon,=0AIn th
e tests that I conducted with the 33000 I found that the carb as supplied i
s fitted with the float needle seat 2.25mm diam which is meant for gravity
feed and at the anything above 2700rpm the seat leaks additional fuel into
the bowl and makes the mixture excessively rich. The pump fed carb should b
e fitted with a smaller needle seat.=0AIf you run the carb as supplied with
gravity feed alone it will run leaner that the others above 2700 but I fou
nd it still within EGT limits.=0APeter H=0A=0A=0A=0AFrom: owner-jabiruengin
e-list-server@matronics.com [mailto:owner-jabiruengine-list-server@matronic
s.com] On Behalf Of Don Morrisey=0ASent: Sunday, 21 October 2007 3:24 AM=0A
Fuel Pumps on High Wing??=0A =0AHello,=0A =0AMyself and another BushCaddy
builder will be installing our 3300's very soon on our high wing taildragge
rs. I am curious how many high wing airplanes (or others) have been able t
o eliminate the engine driven fuel pump and therefore the backup and run on
gravity? This would be with the standard Bing Carb. Thanks.=0A =0ADon...
=0Awww.donsbushcaddy.com=0ADon Morrisey's Skunkworks=0A=0A=0A=0A=0A=0AWindo
ws Live Hotmail and Microsoft Office Outlook ' together at last. Get it n
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