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Fuelman -> Castor added (2/2/2002 9:12:56 AM)
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Gentlemen,
Adding castor to an all synthetic fuel is not a bad thing- Too a point.
Cool Power 30 heli has 23% total oil in it already. It is (according to Morgan's) an all synthetic oil specifically formulated for heli's. From what I was told by Morgan's over the phone, their heli oil is somewhat of a lighter weight (viscosity or hydroxyl) than their non heli synthetics. Yes, your big 4-strokes will will run quite well on it. How they last to some unintentional abuse with the lighter oil, I will not comment upon.
If you add a little castor, say 2% to the CP 30 heli, you will be at 25% total oil content- that's actually quite a bit for a 4-stroke. In my opinion, any amount of oil over 22% yields no benefit in longevity and negative returns in performance. You are actually decreasing the "burnable" mixture in the fuel.
I have found that 20% total oil (18% syn/2% cas) is a great combination to protect the engine, keeping in mind that the synthetics are not a light weight heli type.
Try an experiment and tell us what your results are:
Compare CP 30% Heli with 2% added castor against
Cooper's or S&W's 25% nitro/ 20% oil (18/2 blend).
Same day, same prop, same plug, and tuning your engine to the fuel.
You'll be absolutly amazed by your findings!
To answer your castor question: I have never used medicinal grade castor in testing but from what I've read, it will work. I've also read the fatty acid molecules in medicinal grade are different enough to not lubricate as well as a "AA" graded castor which is a lubricant grade. You can buy small quantities of Klotz BeNol or Sig AA castor in numerous places, so use that if its available to you rather than medicinal grade.
Fuelman
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