[NSRCA-discussion] Fuel Regulation in 2C Engines

[Tim]

Arch,
 
Did you receive the regulator that I sent in yet?  Just looking to see
when I'll get it back. 
 
Thanks,
Tim Wortkoetter
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Arch
Stafford
Sent: Sunday, March 05, 2006 8:41 AM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] Fuel Regulation in 2C Engines
 
The Iron Bay works perfectly for our applications.  I know of several
guys running them in 1.60 2 strokes.  It is a true on demand regulator.
Tank is pressurized to force fuel to the back of the diaphragm.  Then
the carb opens the valve as it needs fuel.  It works very well, however
I'm not sure it will totally fix the issue of 2 strokes winding up and
winding down.  A think a lot of that would have to do with friction and
the number of moving parts.   I know a lot of guys, myself included have
helped speed downlines with 2 strokes by going to 3 and 4 blade props.
The IB regulator will work though very well for our applications.  
 
Arch Stafford
 
 
  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
vicenterc at comcast.net
Sent: Sunday, March 05, 2006 9:30 AM
To: NSRCA Mailing List; NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Fuel Regulation in 2C Engines
 
Good point.  No, I never tried in 2 C.  I used the Cline regulator long
time ago in a Saito engine with not good results (sport plane).  Base on
feedback from others those two system do not work properly in pattern
applications.  However, any new feedback is welcome.
 
Vicente
 
 
-------------- Original message -------------- 
From: "Ken Thompson" <mrandmrst at comcast.net> 
Vicente,
 
Have you thought about switching to a Iron Bay or Cline regulator?  It's
a thought, I believe these systems operate more like a YS than a Perry
does.
----- Original Message ----- 
From: vicenterc at comcast.net 
To: nsrca-discussion at lists.nsrca.org 
Sent: Sunday, March 05, 2006 9:19 AM
Subject: [NSRCA-discussion] Fuel Regulation in 2C Engines
 
Good morning all,
 
I have been using the OS 160, OS 140 RX and Mintor 140 with good results
in the last 4-5 years.  We have been comparing and discussing the
advantages of YS compared with 2C.  One of the main advantages of YS is
that in transition when power down the engine goes instantly to 2000 RPM
or less.  The 2C engines always takes too much time to get down to idle
and I believe that causes us (in pattern) some problems.    
 
I have been thinking that the problem is that the carburetor and or fuel
system that can not regulate properly (pressure or flow).  I think in
these engines, the pumps are set to deliver fuel at full flow (or
pressure) without any regulation system (like the YS).  I had the
opportunity to discuss this issue with Perry Pump and they recommended
to install a by-pass line.  The idea is to send the excess fuel
(pressure) back to the tank during transition.  Perry Pump recommended
to install the T as close as possible to the carburetor needle valve.
Also in their web site they have an idea that he said is used for cars
that is a by-pass line that loop around the pump
(http://www.perrypumps.com/instructions.htm,  Click on Pump and By-Pass
Systems).  I think the ideas deserve some checking since it is natural
to have this type of regulation to maintain constant press! ! ure in the
line before needle valve.  I tried the other day the by-pass to the
carburetor but I installed the T too far from the carburetor and forgot
to open the vent in the tank.  Of  course the results were bad since I
was developing vacuum in the tank.  I will try these options of by-pass
lines as soon as get warmer.  However, I think someone out there already
tried to do this and know results so I am looking for feed back.
 
Thanks in advance,
 
Vicente Bortone
 
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