[NSRCA-discussion] Ideas?

[vicenterc at comcast.net]

Looks like you have done everything.  However, I will be suspicious that something in the fuel is messing up the plugs.  Base on your description the engine runs OK for the day using the Morgan 20% fuel.  I wonder if you could try another fuel for the whole flying section and check next day.  It could be a bad batch of fuel.  Just an idea.  

Question:  Are you both using same fuel?

Good luck at the Nats.

Vicente Bortone
  

-------------- Original message -------------- 
From: Ron Van Putte <vanputte at cox.net> 

> 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 
> 
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