[NSRCA-discussion] OS 140Rx pump question

[Wayne Galligan]

First thing I would do is switch over to regular Cool Power.    Omega has
castor oil and it can gum up or varnish in the engine.  You will have a bear
of a time getting the rod to slide on the piston wrist pin because of the
castor gumming up on the pin.  The regular Cool Power uses synthetic and
does not gum up on any of the parts.

The pipe length sounds about right.  But one inch short and it will run fat
in the midrange.  Try a little longer and switcging to Cool Power 15% or
20/20 blend

Wayne


----- Original Message ----- 
From: "John Pavlick" <jpavlick at idseng.com>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, September 24, 2006 7:49 PM
Subject: Re: [NSRCA-discussion] OS 140Rx pump question


> 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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