[NSRCA-discussion] Ideas?

[Ed Miller]

Although I haven't run into this particular problem I will say I remove the 
anodizing from the head gasket surface and glow plug sealing areas of the 
Mintor head.  I originally did this as I could not get the glow plug to 
light and we traced it back to no continuity between the head and cylinder 
liner/crankcase.  My experience with 2 strokes has been worn big end and 
small end of connecting rod and excessive clearance between the crankshaft 
and crankcase cause erratic running characteristics. One other thing I would 
look at is a dislodged baffle in the pipe and/or partially blocked header 
and/or pipe.
Ed M.
----- Original Message ----- 
From: "Ron Van Putte" <vanputte at cox.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Friday, July 14, 2006 11:36 AM
Subject: [NSRCA-discussion] Ideas?


> John Fuqua has been having an annoying and thoroughly confusing
> problem.  He has been using two different OS 1.40 RX engines for the
> past three years and they've run flawlessly until recently.  He's had
> one in an Impact since the early spring.  A month or so ago, the
> engine started dying in the air periodically when he advanced the
> throttle from idle.  He tried adjusting the idle mixture control and
> the main needle valve and the problem seems to go away.
>
> Suddenly, a few days ago, the engine would die as soon as the ignitor
> was removed.  No problem:  it's the plug(s).  He's using the Mintor
> 1.40 head on these engines and they have two plugs.  Replace both
> plugs.  Engine ran flawlessly for the rest of the flying session.
> The next day, the problem was back, exactly like it was the day
> before.  Then we removed the entire fuel system, cleaning everything
> and replacing the fuel tubing, fuel filter and tank clunk.  Replaced
> the glow plugs as well.  Engine ran flawlessly for the rest of the
> flying session.  The next day, the problem was back, exactly like it
> was the day before.   Yanked out that engine and installed its twin,
> fresh after a rebuild.  Engine ran flawlessly for the rest of the
> flying session.  The next day, the problem was back, exactly like it
> was the day before.  John has been using Morgan 20% heli fuel as long
> as he's been running these engines and it's worked great.
> Nevertheless, during this ongoing saga, we tried Morgan 30% heli fuel
> and Morgan Pro Power 20% and nothing seems to break the pattern.
> HELP!  We leave for the Nats tomorrow.
>
> BTW, I have been using an OS 1.40 RX in my airplane for the past two
> seasons and have loved it.
>
> Ron Van Putte
>
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion