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Author Topic: Oil content...  (Read 1317 times)

Offline Bootlegger

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Oil content...
« on: May 29, 2008, 10:38:44 AM »
 :!  Guy's I have a gallon of 22% oil half castor half synthetic. To bring the castor content up to 22- 25 % how much castor (percentage wise) would I need to add ?
     Thanks, Gil
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Gil Causey
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Offline Mike Spiess

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Re: Oil content...
« Reply #1 on: May 29, 2008, 10:40:22 AM »
You don't stop flying cause your get OLD
You get OLD cause you stopped flying
St Peter MN
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Offline Jim Thomerson

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Re: Oil content...
« Reply #2 on: May 29, 2008, 11:16:01 AM »
I'm not clear on what you want to do.  If you bring your castor alone up to 22%, that is 11% synthetic, 11% +  11% castor = 33% total oil.  I don't think that is what you mean.  I've been running a Fox stunt 35 on Sig Champion 10% nitro, 20% oil, 50/50 synthetic, castor.  Engine seems to like it, but that is contrary to the conventional wisdom. 

Offline Just One-eye

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Re: Oil content...
« Reply #3 on: May 29, 2008, 11:37:32 AM »
When I was still using my iron piston Foxes regularly, I found that repeatable needle settings were just not readily available with less than 21-22 % total oil, by volume, at least not for a classic 4-2-4 stunt run.  For Foxberg, I could get repeatability with a straight two cycle, but the usual 20% oil fuels for that event tended to allow the engines' piston to cylinder seal to wear out rapidly. 

Meanwhile, Powermaster GMA 22%/ 10% half synthetic, half castor has been the base fuel I add castor to for the rare occasions when I do use an oldie iron motor.  Adding four ounces of castor gives you a total oil content of 25%.

Offline Bootlegger

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Re: Oil content...
« Reply #4 on: May 29, 2008, 11:52:35 AM »
  Guy's Thanks for the reply's. What I was looking for was a total oil content that would be safe for some old cast iron piston and liners, such as Fox, Mccoy, and Merco's .
  I don't want to bring the oil content up to 22-25% total castor, just get it high enough to be safe in these older engines.
  A total oil content of enough castor with some synthetic just to keep from getting a castor "gum up" in the engines is what I should have asked instead...
 Again Thanks, #^
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Gil Causey
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Offline Garf

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Re: Oil content...
« Reply #5 on: May 30, 2008, 10:27:20 PM »
I feel 25% castor with 1% synthetic would be minimum for safe running of a McCoy or Fox, and that only after break in.


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