[NSRCA-discussion] o.s. 1.60 backplate fuel pump ?

[Nat Penton]

Mike
I have been running the 140RX pump, also the Hanno pump, with no adjustments, on the 91FX for several years. You need to screw in the carb idle adjust several rounds. No problems.

What about the pump and carb that comes on the new OS 91SZ heli. I wouldn't hesitate to run it on the 160. The pump is mounted on the backplate, not in it. Review SEPT/Oct 3-D Flyer.                              Nat
  ----- Original Message ----- 
  From: Mike Hester 
  To: NSRCA Mailing List 
  Sent: Saturday, November 04, 2006 6:25 PM
  Subject: Re: [NSRCA-discussion] o.s. 1.60 backplate fuel pump ?


  FWIW, the carb on the OS160 is the exact same carburator on the .91 FX.

  -Mike
    ----- Original Message ----- 
    From: Lance Van Nostrand 
    To: NSRCA Mailing List 
    Sent: Saturday, November 04, 2006 7:07 PM
    Subject: Re: [NSRCA-discussion] o.s. 1.60 backplate fuel pump ?


    Jon,
    I first saw a built in pump overheat on a Webra 145 in Lubbock (3000ft) on a 104 degree day.  After that I convinced the Mintor folks to install a nylon isolator/insulator.  They eventually got it done right (their first attempt leaked) and sent me test results of the engine running in 160 degree ambient.  My concern with the perrys is that they seem to work for a while, then need adjustment.  now I know there are probably a lot that have found them rock solid, but my observations are otherwise.  I know several that have had much better luck placing the tank on the firewall and eliminating the pump for the 160.  in my observations, if I were to use a 160, this is what I'd do.  The 160 was not really designed for a pump and has a small venturi with a lot of suction and doesn't need a pump.  Engines designed with a pump in mind might not be able to get away without one.
    --Lance

      ----- Original Message ----- 
      From: JonLowe at aol.com 
      To: nsrca-discussion at lists.nsrca.org 
      Sent: Saturday, November 04, 2006 11:49 AM
      Subject: Re: [NSRCA-discussion] o.s. 1.60 backplate fuel pump ?


      In a message dated 11/4/2006 1:01:33 AM Central Standard Time, toneuf at sbcglobal.net writes:
        Guys,
                    OK,   I got into this discussion late... 
               I am trying to locate a backplate
               fuel pump unit for my O.S.  1.60  FX engine.
               I read the infomation by Tom Koenig from last year, but still need the
               unit contact information.
               Does this unit acutally exist ?
               Maybe someone out there has a unit to sell?
               If not, can you  give me the forward  to this unit ?
               Austrialia?   Sheesh....
                  Regards,  Robert Hixson    San Francisco
      When I first heard about people doing this, I thought it was really neat.  Now, after thinking about it, I can't recommend doing this.  Many engines with backplate pumps have problems with the pumps overheating, and vaporlocking or deteriorating.  I've seen this on Webras and Mintors, and watched the owners go to external Perry pumps.  Having the pump separate keeps its temp closer to ambient.  Plus, you can go to almost any hobby shop in the country, and buy a Perry pump off the rack for $30, and not worry about having a hard to find spare in an emergency.  You can change it out without removing the engine if you suspect a problem.  Todays widebody pattern ships have plenty of room in the nose, so mounting it is not an issue.  In addition, a separately mounted pump makes it much easier to adjust pressure as you are setting it up, and it isn't subjected to all of the vibration of the engine.

      Just my opinion.

      Jon Lowe



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