[NSRCA-discussion] Fuel Regulation in 2C Engines

[Arch Stafford]

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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