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Old 06-23-2007, 03:34 PM   #11
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Re: What is the best fuel to use?

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Originally Posted by chuebner
Hi guys.... What is the best fuel blend to use in 2st. and 4st. engines? Some say full synthetic to avoid deposits and gumming and some say syn/castor blend for lube. I am using Morgan Omega syn/castor 17% and Powermaster syn/castor 18%. Should I go strictly to full synthetic like Morgan Cool Power to avoid the varnish buildup on valves on 4st. or what???


Curt, waht are you flying that you need 17% fuel?

OK, I'm coming from the sport flying end of things and everyone that I know used 5% or maybe 10%.
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Old 06-23-2007, 08:47 PM   #12
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byrocat.. the 17% is the oil content. I am using 10% Nitro.


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Old 06-23-2007, 09:56 PM   #13
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5% for sport
15% for combat 25fx
15% four stroke for the saito

Just my humble opinion
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Old 06-24-2007, 10:02 AM   #14
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Four strokes like high nitro. Having to do two revolutions between firings, it helps keep the glow plug lit, especially at idle. They also don't like to run overly rich, unlike a 2 stroke. Poor performance plus carbon buildup.
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Old 06-24-2007, 12:59 PM   #15
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Curt, I looked through my stack of Model Airplane News mags and found that for four strokes it is recommended no less than 15% nitro and 20% oil, 17% synthetic and 3% castor. The editors say that they will "custom blend" some of their oil by adding a bit of castor but I think generally too high a castor content is not desireable in four stroke fuel because it carries away too much of the residual heat which is needed to keep the glow plug hot. I think any name brand fuel will be fine as long as these basic guide lines are followed. They do recommend using an O.S. "F" glow plug because they seem to work the best.
For two strokes I would think any of the fuels will work fine. Proper break in and not running overly lean is your best protection from ruining your engine. That and not plugging them in the dirt at full throttle.
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