[NSRCA-discussion] OS 140Rx pump question

[John Pavlick]

Sorry - Aeroslave pipe, APC 15.75x10 3-blade (re-pitched by Dave L.). Fuel
is morgan Omega 15%. The pipe is currently set at 31 3/4" straight-line from
plug center to the end of the pipe with an OS O-ring header. I know this
measurement only makes sense if using the same header or at least one with
the same total length.

John Pavlick
http://www.idseng.com


> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of
> Wayne Galligan
> Sent: Sunday, September 24, 2006 8:31 PM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] OS 140Rx pump question
>
>
> John,
>
> What pipe? What fuel? What prop are you using?
> Lengthen your pipe till the midrange richness goes away.  My OS
> will do the
> same thing.  The needle on mine is about 3/4 turn out also .  I would not
> mess with the pump till you have tried lengthening the pipe.  This almost
> always fixes that problem.  Less load(smaller prop) on the engine shorten
> pipe, more load(larger prop)lengthen the pipe.
>
> Wayne Galligan
> ----- Original Message -----
> From: "John Pavlick" <jpavlick at idseng.com>
> To: "NSRCA Discussion" <nsrca-discussion at lists.nsrca.org>
> Sent: Sunday, September 24, 2006 12:29 AM
> Subject: [NSRCA-discussion] OS 140Rx pump question
>
>
> > I'm having some trouble with my OS 140Rx and it seems to me that maybe
> > somebody played with the pump (I bought this motor used). Here's what's
> > going on. The main needle wants to be at about 3/4 turns out. Not even a
> > full turn. If I open it to 1 1/4 turns it's slobbering rich. The idle is
> > rich even with the adjustment turned fully clockwise. It is
> flyable, but I
> > know something isn't right. This motor also has a dual-plug OS head. I
> have
> > an "F" plug in the center and an "8" in the rear. The transition isn't
> > great, especially at about 1/2 throttle. On the ground it will actually
> load
> > up sometimes. In the air it's not so bad but it doesn't sound
> right. If it
> > had a Perry pump I'd back off the pressure and that would
> probably fix it.
> > Like I said, I'm thinking someone played with the pump for whatever
> reason.
> > Is there any way to set it up as it was originally or do I have
> to send it
> > back to the service center?
> >
> > John Pavlick
> > http://www.idseng.com
> >
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