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  1. #1

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    OK fuel guru's....here is a tuff one

    then again maybe not...........
    fuel in my stock is Sig all castor fuel.
    25% oil, and 10% nitro content.

    need to bring it up to 25% by aqdding Nitro, but i'm not sure what the amount to add would be?

    why fool with it and not simply buy more you might say.........i have 4 gallons of this and don't want to toss it if i can make it work.

    AMA 70865
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  2. #2

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    RE: OK fuel guru's....here is a tuff one

    Question: Do you want to keep the oil percentage at 25 percent?
    Regards
    JC

  3. #3

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    RE: OK fuel guru's....here is a tuff one

    Solve your problem in ounces.
    There are 128 ounces in a gallon.
    So you've got 32 ounces of oil at 25 percent oil.
    Your 10% nitro fuel should have 12.8 ounces of nitro per gallon (call it 13 ounces).
    Apparently you want to raise the nitro percentage to 25%.
    So in your final mix you want to have 32 ounces of nitro per gallon.
    Seems to me that 10% should be OK for whatever you're doing....except for racing.
    Regards
    JC

  4. #4

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    RE: OK fuel guru's....here is a tuff one

    i would like to keep the oil percentage at no less than 20%.

    the fuel was originally bought for use in a couple older RC engines that were designed to be run on castor oil fuels with minimum 25% oil. the conrods are non bushed and would die with synthetic oiled fuels.
    the engine i want to run this fuel in now is the K&B 40RR from the late 60's which also have non bushed conrods.
    AMA 70865
    Team Satellite

  5. #5

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    RE: OK fuel guru's....here is a tuff one

    Pour 12 ounces of nitro into 88 ounces of your original fuel = 100 ounces of new mix at 25% nitro and 22% oil
    Regards
    JC

  6. #6

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    RE: OK fuel guru's....here is a tuff one

    JC,

    thank you for your help.
    AMA 70865
    Team Satellite

  7. #7

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    RE: OK fuel guru's....here is a tuff one

    ORIGINAL: JCINTEXAS

    Pour 12 ounces of nitro into 88 ounces of your original fuel = 100 ounces of new mix at 25% nitro and 22% oil
    I think that will only get the nitro to about 21%, not 25%. To get to 25% nitro, pour 16.7 oz nitro into 83.3 oz of the original fuel. The resulting 100 oz of fuel will have 25% nitro and about 21% oil. Or, just pour 25.6 oz of nitro into a gallon of the original fuel to get the same result. (I think JC used 15% nitro in the original fuel in his calculation, not 10%)

  8. #8

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    RE: OK fuel guru's....here is a tuff one

    what needs to be brought up to 25% Oil or Nitro?

    you have 4 gallons of what? fuel or oil or niro.

    is your current fuel
    25% Oil +10% Nitro + 65% Methanol = 4Gallons ? (is this the problem statement)




  9. #9

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    RE: OK fuel guru's....here is a tuff one


    ORIGINAL: hauckf

    ORIGINAL: JCINTEXAS

    Pour 12 ounces of nitro into 88 ounces of your original fuel = 100 ounces of new mix at 25% nitro and 22% oil
    I think that will only get the nitro to about 21%, not 25%. To get to 25% nitro, pour 16.7 oz nitro into 83.3 oz of the original fuel. The resulting 100 oz of fuel will have 25% nitro and about 21% oil. Or, just pour 25.6 oz of nitro into a gallon of the original fuel to get the same result. (I think JC used 15% nitro in the original fuel in his calculation, not 10%)
    hauckf,
    thx for the formula.
    appreciate that you understand what i am using and trying to modify.............i'll juice up a quart first and if that works then i'm set.
    worst case scenario- BUY NEW FUEL and give the 10% stuff away......
    thx

    -mike
    AMA 70865
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  10. #10

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    RE: OK fuel guru's....here is a tuff one

    Try this site when mixing fuel http://www.nitrorc.com/fuelws/allmix.asp


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