Using check valve in YS 140DZ fuel system

[tony at radiosouthrc.com]

Peter:
The Japanese were doing this at the W/C in Poland.  It keeps the injector
line from draining empty when at low throttle.  It seems to work for me!

Tony Stillman
Radio South
3702 N. Pace Blvd.
Pensacola, FL 32505
1-800-962-7802
www.radiosouthrc.com
----- Original Message ----- 
From: "Peter Pennisi" <pentagon.systems at bigpond.com>
To: <discussion at nsrca.org>
Sent: Monday, August 30, 2004 4:41 PM
Subject: RE: Using check valve in YS 140DZ fuel system




Hi Tony,

Could you please share your thoughts on check-valve placement especially on
the injector line? Earl also suggested placing one on the fuel feed line if
I understand correctly. That makes it 3 possible locations when you include
the vent line.

I didn't know that people are placing them in the injector line. I am very
interested to hear more.

Earl, what is the theory behind placing it on the feed line. I assume in all
of the cases the valve is orientated such that it goes in the direction of
either fuel or air flow, or is there something different here as well.

Sorry for all the questions, now you have me thinking.


Regards,

Peter



Peter Pennisi
Pentagon Systems QLD Pty Ltd
P.O Box 4280
Eight Mile Plains
QLD 4113
Australia
Phone: 61+0738414234
Fax: 61+0738414264
Mobile: 0408007206
Email: pentagon.systems at bigpond.com
________________________________________
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On
Behalf Of tony at radiosouthrc.com
Sent: Tuesday, 31 August 2004 5:25 AM
To: discussion at nsrca.org
Subject: Re: Using check valve in YS 140DZ fuel system

Ed:

Most of the uses of the check valve are in the injection line going to the
head. This will also prevent the line from going empty during idle
maneuvers, and giving a hesitation during throttle up, like at the bottom of
an outside loop. I have installed one earlier this year, and it did seem to
help this issue.


Tony Stillman
Radio South
3702 N. Pace Blvd.
Pensacola, FL 32505
1-800-962-7802
www.radiosouthrc.com
----- Original Message ----- 
From: Ed Deaver
To: discussion at nsrca.org
Sent: Monday, August 30, 2004 2:06 PM
Subject: Re: Using check valve in YS 140DZ fuel system

I've used the check valve in the vent line from day one without any
problems. Have never noticed any pressure buildup at all in the tank.

ed

Peter Pennisi <pentagon.systems at bigpond.com> wrote:


Some flying buddies of mine have been having a discussion about using a
check-valve in the fuel system to essentially stop fuel from dripping out of
the vent line. I have been using this system without any problems that I
know off for some time. One of the pattern flyers I fly with is very good
with engines and he doesn't think it is a very good idea to use the valve in
the DZ fuel system as the tank will always have a slight pressure build up
inside which may result in inconsistent engine runs. I don't know about his
theory but I do know that all the Japanese flyers at the recent CAOCC event
were using check valves in the fuel system.

I would be interested to hear from anyone who may have an opinion on this
subject.


Regards,

Peter


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