Today's Message Index:
----------------------
1. 03:30 AM - Re: Re: Fuel Return Line (klinefelter.kevin@gmail.com)
2. 06:29 AM - Re: 912iS paper (Christoph Both)
3. 07:05 AM - Re: [Spam] Re: Re: Fuel Return Line (Alex Kaarsberg)
Message 1
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| Subject: | Re: Fuel Return Line |
Jim,
I have my 914 fuel return set up as Graham describes, and no problems. I hav
e never checked the return line pressure.
What problem are you experiencing?
Kevin
On Nov 1, 2012, at 8:32 PM, GRAHAM SINGLETON <grahamsingleton@btinternet.com
> wrote:
> Jim
> I have always put the fuel return into the top of the tank, (I used a rede
signed tank fitting that incorporated the breather connection (3/8 aluminum)
> fuel return and sight gauge return connection. Much less back pressure at t
he top of the tank and the (maybe hot from the engine driven pump)
> then mixes with the main bulk of the tank contents before going baCK TO TH
E ENGINE. sorry kaps lok again!
> Graham
>
> From: "h&jeuropa" <butcher43@att.net>
> To: europa-list@matronics.com
> Sent: Thursday, 1 November 2012, 19:45
> Subject: Europa-List: Re: Fuel Return Line
>
>
> While trying to understand our recent 914 power problems, we talked to Rob
Seaton at Rotech.
>
> He suggested we measure how much pressure is required to return the fuel t
o the tank (from regulator). Remove return hose from top of regulator, plug o
ne side of banjo fitting and blow into other (don=C3=A2=82=AC=84=A2t i
ngest fuel!). it should be very easy (max is 1.5 PSI pressure loss with both
pumps on: 914 installation manual sec 14.3)
>
> We found with the fuel tank full the pressure required was more than we co
uld easily blow. With the tank half empty not much pressure was required. O
ur system is per Europa with the return at the bottom of the tank. Calculat
ions show the pressure of the column of fuel in a full tank (15 inches of fu
el) is about .4 psi which is certainly less than 1.5 psi.
>
> The Europa setup has worked OK for over 400 hours, but perhaps it would be
better to return the fuel to the top of the tank. Opinions?
>
> Jim & Heather
> N241BW
>
>
>
>
> Read this topic online here:
>
> http://forums.matronicsease Support ref="http://www.matronics.com/contri
bution">http://www.matronics.com/contbsp; -Matt Dralle, List Adm
in. --> http://www.matronics.com/Navigator?Europa-Listhttp://forums.matronic
s.com
> _=============
>
>
>
>
>
> <Europa breather system sketch copy.jpg>
Message 2
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Any one out there having obtained the paper and willing to share it with th
e EUROPA group?
Christoph Both
Wolfville Nova Scotia
Canada
EUROPA #223
From: Jan de Jong <jan_de_jong@casema.nl<mailto:jan_de_jong@casema.nl>>
ropa-list@matronics.com<mailto:europa-list@matronics.com>>
ist@matronics.com<mailto:europa-list@matronics.com>>
Subject: Europa-List: 912iS paper
(copied from RotaxEngines list)
Those interested in the design of the 912iS may want to buy SAE paper nr 20
12-32-0049.
By 3 Rotax engineers and recently presented at an SAE conference.
It costs $23 and can only be printed, during 24 hours, not saved.
Some of the figures need to be printed separately to make some very small p
rint readable (primitive but working procedure: zoom to maximise on screen,
copy screen to clipboard, paste into picture viewer like Irfanview, crop i
n picture viewer and print/save).
I found it interesting. A lot of questions were answered, quite a view rema
in.
Jan de Jong
rsbooks.com>
m>
Message 3
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| Subject: | Re: Fuel Return Line |
I would expect return pressure to depend on the height to which it is pushed
, ie the height of the surface or opening.
Exit to top of tank will provide equal (in average higher) back pressure tha
n if return is at the bottom, all other parameters being equal...
Alex, kit 529
Enviado via iPhone
Em 01/11/2012, =C3-s 23:32, GRAHAM SINGLETON <grahamsingleton@btinternet.c
om> escreveu:
> Jim
> I have always put the fuel return into the top of the tank, (I used a rede
signed tank fitting that incorporated the breather connection (3/8 aluminum)
> fuel return and sight gauge return connection. Much less back pressure at t
he top of the tank and the (maybe hot from the engine driven pump)
> then mixes with the main bulk of the tank contents before going baCK TO TH
E ENGINE. sorry kaps lok again!
> Graham
>
> From: "h&jeuropa" <butcher43@att.net>
> To: europa-list@matronics.com
> Sent: Thursday, 1 November 2012, 19:45
> Subject: Europa-List: Re: Fuel Return Line
>
>
> While trying to understand our recent 914 power problems, we talked to Rob
Seaton at Rotech.
>
> He suggested we measure how much pressure is required to return the fuel t
o the tank (from regulator). Remove return hose from top of regulator, plug o
ne side of banjo fitting and blow into other (don=C3=A2=82=AC=84=A2t i
ngest fuel!). it should be very easy (max is 1.5 PSI pressure loss with bot
h pumps on: 914 installation manual sec 14.3)
>
> We found with the fuel tank full the pressure required was more than we co
uld easily blow. With the tank half empty not much pressure was required. O
ur system is per Europa with the return at the bottom of the tank. Calculat
ions show the pressure of the column of fuel in a full tank (15 inches of fu
el) is about .4 psi which is certainly less than 1.5 psi.
>
> The Europa setup has worked OK for over 400 hours, but perhaps it would be
better to return the fuel to the top of the tank. Opinions?
>
> Jim & Heather
> N241BW
>
>
>
>
> Read this topic online here:
>
> http://forums.matronicsease Support ref="http://www.matronics.com/contri
bution">http://www.matronics.com/contbsp; -Matt Dralle, List Adm
in. --> http://www.matronics.com/Navigator?Europa-Listhttp://forums.matronic
s.com
> _=============
>
>
>
>
>
> <Europa breather system sketch copy.jpg>
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