[NSRCA-discussion] OS 140Rx pump question

[vicenterc at comcast.net]

John,

I have the same problem in my old 140 Rx.  Decided to replace piston, ring and connecting rod.  As soon as I replace the parts I will really know if that is the solution.  My engine is very old so it makes sense to me.  The question is:  how much your engine was used in the past?  

I will let you know but is going to take me some time.  I will run the engine on the bench as soon as I replace the parts.

Vicente "Vince" Bortone  

-------------- Original message -------------- 
From: "John Pavlick" <jpavlick at idseng.com> 

> 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" 
> > To: "NSRCA Discussion" 
> > 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 
> > > 
> > > -- 
> > > No virus found in this outgoing message. 
> > > Checked by AVG Free Edition. 
> > > Version: 7.1.405 / Virus Database: 268.12.8/455 - Release Date: 9/22/06 
> > > 
> > > _______________________________________________ 
> > > 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 
> > -- 
> > No virus found in this incoming message. 
> > Checked by AVG Free Edition. 
> > Version: 7.1.405 / Virus Database: 268.12.8/455 - Release Date: 9/22/06 
> > 
> -- 
> No virus found in this outgoing message. 
> Checked by AVG Free Edition. 
> Version: 7.1.405 / Virus Database: 268.12.8/455 - Release Date: 9/22/06 
> 
> _______________________________________________ 
> 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/20060925/3dd5c360/attachment.html