OS 91 engine info

[Scott Anderson]

Eddie,
Thanks for the info.. How much work is too put the pump in? I have not had any fuel feed problems yet.. tank on cg .. Did you run the same pipe lenght without the pump?

scott
  ----- Original Message ----- 
  From: W. Eddie Batchelor 
  To: discussion at nsrca.org 
  Sent: Saturday, November 01, 2003 10:23 AM
  Subject: Re: OS 91 engine info


  Scot
  I don't know if you keep old messages or delete them -so I'll copy one here for you.
  Nat Penton posted the foollowing info on 10-25-03 :
  >Matt I will add additional  info. Have been running the 91FX over two years
  >and it will carry my 8+ lb airplanes to the moon. On fuel - was using
  >Ritches 20%, now 30%,idles under 1500. Pipe length- 26 to 28" depending on
  >which pipe, most power from ES 2 stk(1 9/16 OD), Favorite props 17X10N cut
  >to16" and 15.5X12, rpms around 7700. Using Hanno (same as 140RX) backplate
  >pump. Can be installed with simple tools and a little ingenuity. O yes 2
  >headshims. Stock bearings good for about 30 flts, Boca sealed well over 100,
  >leave all seals in place. Provide crankcase cooling for longer bearing life.
  >Have not tried 15CC Hatori or MACS but plan to. Headers are from Karl
  >Mueller,very nice.

  if you start with the 15X10 prop and work up you might be surprised at the power with the longer pipe settings.

  Eddie


    ----- Original Message ----- 
    From: Scott Anderson 
    To: discussion at nsrca.org 
    Sent: Saturday, November 01, 2003 8:36 AM
    Subject: Re: OS 91 engine info


    Thank you for the reply, I'm still in the tuning phase also right now with a OS 91 fx and using the Karl Mueller header and a macs pipe (1062), I'm running 25% cool power with a 14x10 and 15x10 prop. 
      ----- Original Message ----- 
      From: Ihncheol Park 
      To: discussion at nsrca.org 
      Sent: Friday, October 31, 2003 10:42 PM
      Subject: RE: OS 91 engine info


      Hi, Scott,

      My 91 SX-H with standard Macs Products' 91FX header and Blue Bird 140 2C pipe (not available in the states anymore) turns APC 15x8 @ 10250 @21.6" from glow plug to first baffle.  Not all tuned yet.  This is with Magnum #1 or Coolpower 25%.  I don't remember which fuel I used when measured this.

      Hope this helps,

      Ihncheol Park
        -----Original Message-----
        From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Scott Anderson
        Sent: Thursday, October 30, 2003 4:56 AM
        To: discussion at nsrca.org
        Subject: OS 91 engine info


        Good Morning,

        I see that there was some info being kicked around about the os91 2 stroke engine with props and a head shim, but what is the pipe length to first baffle from glow plug ( straight line). 
        Thanks..

        scott
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