[NSRCA-discussion] Fuel Regulation in 2C Engines

[Grow Pattern]

Vicente,
               I have installed and run a whole bunch of Cline regulators on OS 1.60's with much more success than the Perry's. Six of my own planes have used the Clines. One thing I did with soft-mounted engines was put the needle assembly on the firebox/wall rather than on the back of the engine.

The Cline needs you to prime the lines for the first start of the day.This is done by putting  a finger over the carb intake and a couple of turns of the prop. I saw one guy use an ear-plug in the carb, that he removed after the line had fuel in it.

I ran the Perry's, four of them, but they would not hold their settings after about 200 runs. The Clines never changed. (This is another of those religious wars BTW - the only real answer is to try it for yourself and then decide)

I will argue that you need to fly a whole "season", say 300 plus runs, before you know if you have equaled the reliability of a 4-c YS, or what ever your goal was. I get the same thoughts when I see the twin-plug head reports that say which plugs to run. I ran them for a year and they didn't  last more than 100 runs, often much, much less. You never know if what you are being told was fully tested of if you are hearing a short-circuit conclusion. A single OS "F" plug in an OS 1.40 or 1.60 should last all year. A handful of flights is not enough to draw any good conclusion.

Regards,

Eric.

P.S. Two-cycles that don't spool down quickly are usually being run too hot.


----- Original Message ----- 
  From: vicenterc at comcast.net 
  To: NSRCA Mailing List ; NSRCA Mailing List 
  Sent: Sunday, March 05, 2006 9:30 AM
  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



--------------------------------------------------------------------------


      _______________________________________________
      NSRCA-discussion mailing list
      NSRCA-discussion at lists.nsrca.org
      http://lists.nsrca.org/mailman/listinfo/nsrca-discussion


------------------------------------------------------------------------------


  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20060305/2d73af0e/attachment.html