[NSRCA-discussion] 140 DZ and Hatori Header

[verne at twmi.rr.com]

I had similar carbon problems off and on back when I flew glow and it took me about ten years to figure out the problem. Magnum, Powermaster, and Cool Power are all excellent fuels but they don't like each other. Every time I had the carbon problem you're describing, it was either after I switched from one of these brands to the other, or worse yet, mixed two of them together. Since the nitro and alcohol are the same in all fuels, the only thing left is the synthetic oil. Again, each company has excellent products but their oil doesn't get along with the oil from the other guys fuel. I remember one contest where I was running Powermaster 20/20 and had a gallon of Magnum 2 in case it got hot and humid out. It did, I switched and landed about 3/4 of the way through my flight because the engine started sounding REALLY bad. Took the head off and it was carbon city. I mean, carbon beyond belief. I can cite a bunch of other examples that led me to my conclusions, but the short answer is that if you just changed fuels or mixed two brands of fuel together, look there first. It doesn't mean there's anything wrong with your new fuel, it just means you need to eliminate any trace of the old stuff. Hope this helps.

Verne Koester


---- David Cotton  <davercotton at hotmail.com> wrote: 
> Yep, it was when I was using a bad batch of magnum fuel. I found valves were in an equally bad state.
> Sent via BlackBerry by AT&T
> 
> -----Original Message-----
> From: Ron Hansen <rcpilot at wowway.com>
> 
> Date: Tue, 19 May 2009 00:51:56 
> To: <nsrca-discussion at lists.nsrca.org>
> Subject: [NSRCA-discussion] 140 DZ and Hatori Header
> 
> 
> This weekend I noticed a 1000 rpm loss in power with my 140 DZ.  While taking the engine out I notice a significant amount of soot buildup at the entrance of the Hatori header.  Has anyone ever experienced this before? 
>   
> I know it could be the cause of my loss of power but is this amount of buildup to be expected over several years of use? 
>   
> I'm wondering whether there could be any other issues with the engine that could have contributed to this buildup. 
>   
> Ultimately I will have to put the engine on the test stand and try it out with a clean header. 
>   
> Ron
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