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Engine basics => Engine set up tips => Topic started by: frank mccune on March 23, 2014, 08:16:02 AM

Title: How many oz. of castor oil must I add to 10-10-10 fuel for Fox engine use?
Post by: frank mccune on March 23, 2014, 08:16:02 AM

    Hi Gang:

    I have fuel that is 10% synthetic, 10% castor and 10% nitro.  How many oz. of castor oil must I add to bring the total castor oil content to safe level for use in the older lapped iron/steel engines like O.S, S.T.,Fox, Enya etc.

   I have been advised that the 11%, 11% mix would protect my engines against damage and it was fine to use it in these older engines.  I have had some very lean runs in the O.S. and Fox engines with no damage using fuel that had 6 oz of castor added to the 11%-11% mix with no damage! I have been advised that one can not damage an engine when one was using all castor for lube.  I do not know if this is true, but I have never had it happen to me!

  Perhaps I should just purchase some nitro and mix my own 10% nitro, and 25% castor to be safe!

  Any thoughts about this question?

                                                                                                                                Tia,

                                                                                                                                Franchi

Title: Re: How many oz. of castor oil must I add to 10-10-10 fuel for Fox engine use?
Post by: Dave_Trible on March 23, 2014, 10:28:19 AM

To a gallon of 20% oil fuel I add 12 ounces of oil to have about 29% oil in the fuel.  Old Fox Superfuel was 28%.

Dave

Title: Re: How many oz. of castor oil must I add to 10-10-10 fuel for Fox engine use?
Post by: RandySmith on March 23, 2014, 10:47:40 AM

Quote from: frank mccune on March 23, 2014, 08:16:02 AM

    Hi Gang:

    I have fuel that is 10% synthetic, 10% castor and 10% nitro.  How many oz. of castor oil must I add to bring the total castor oil content to safe level for use in the older lapped iron/steel engines like O.S, S.T.,Fox, Enya etc.

   I have been advised that the 11%, 11% mix would protect my engines against damage and it was fine to use it in these older engines.  I have had some very lean runs in the O.S. and Fox engines with no damage using fuel that had 6 oz of castor added to the 11%-11% mix with no damage! I have been advised that one can not damage an engine when one was using all castor for lube.  I do not know if this is true, but I have never had it happen to me!

  Perhaps I should just purchase some nitro and mix my own 10% nitro, and 25% castor to be safe!

  Any thoughts about this question?

                                                                                                                                Tia,

                                                                                                                                Franchi

You maybe better off either mixing your own, or using 12.5 nitro% and adding 10 ounces of castor to the fuel. This way you will have enough oil, but the nitro would not be so diluted

Title: Re: How many oz. of castor oil must I add to 10-10-10 fuel for Fox engine use?
Post by: Jim Thomerson on March 23, 2014, 05:14:03 PM

I have run Sig Champion 10% nitro, 20% oil, half castor, half synthetic, in all my glow engines, Including Fox stunt 35s and McCoy redhead 19s for many years. I am happy with it. Extra castor won't hurt.

Title: Re: How many oz. of castor oil must I add to 10-10-10 fuel for Fox engine use?
Post by: John Craig on March 24, 2014, 08:46:47 AM

My old engines have gotten by on Sig 10-10-10 to which I have added 1 oz. of Aero Lube & 4oz. of oil, generally a 50-50 mix of castor & synthetic.  I have no complaints.  I once mixed in twice as much oil, but this reduced amount of oil has not made a difference that I can detect.