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Engine basics => Engine set up tips => Topic started by: John KruziK on April 12, 2007, 01:59:02 PM
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Maybe some one can help me out with a small problem, I bought a gallon of Powermaster 10 -22 fuel. Ineed 10 -28 how can I get to 28% castor with out lowering nitro to much? Its for a fox 35 Thanks John
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If I am not mistaken, 10-22 is 11% castor and 11% synthetic, correct me if I am wrong please.
there are 128 ounces of fluid in a gallon,
in 128 oz, there is 22 percent oil that equates to about 28 oz of oil,128 * .22=~28OZ
by adding 8 oz of oil, you will now have 36 oz of oil.
so,
128 = 8 =136oz total mix, 36 oz oil / 136 oz fuel = 26.5 % total oil, see some difference
so to get closer,, lets try 10 oz added oil
128 +10 =138 now there is 38 oz oil,, so 38/138 = 27.5% total oil
128+11 = 139 now there is 39 oz total oil,, so 39/139=28.05 % total oil
Thats how i get there,,
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Maybe some one can help me out with a small problem, I bought a gallon of Powermaster 10 -22 fuel. Ineed 10 -28 how can I get to 28% castor with out lowering nitro to much? Its for a fox 35 Thanks John
Hi John
You can add 10.8 ounces to teh fuel that you bought, that will put it up where FOX super fuel is, however it will lower the nitro content, but it may not make much differance this time of year, it is still cool and you should get good power out of 8%
Regards
Randy
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OK Everybody:
Ole "Billy G" is gonna make this easy for you. Try this:
http://www.nitrorc.com/default2.asp?Introduction=http://nitrorc.com/fuelws
Read it if youwish but if you scroll to the bottom there are 2 boxes. One say oil the other nitro & oil--Click on what you want,fill in the blanks enter it and it does all the figuring for you. Simple. Go ahead and play it will give you the right answers every time, no guesswork.
"Billy G" ;D
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"""Read it if youwish but if you scroll to the bottom there are 2 boxes. One say oil the other nitro & oil--Click on what you want,fill in the blanks enter it and it does all the figuring for you. Simple. Go ahead and play it will give you the right answers every time, no guesswork."""
HI Billy G
One BIG problem with the "right answer every time" is, A lot of fuel makers do NOT use any standard formula for their fuel, many measure their fuel by what the components weigh, so what the say is 18% oil is really 14.7% oil, and what they say is 10% nitro is really 7 to 8% nitro, so there will always be some guesswork involved if you are adding to someone else's blend
Regards
Randy
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Randy;
I guess that means that you think this site is useless for mixing your own fuel? I'm done I won't post helpful info ever again.
Thank-you;
Bill Gruby H^^
If what you say is true about some manufacturers mixing by weight, then all the replies, yours included are guesswork because you really don't know what you have to start with? Yet you chose to quote mine, why is that?
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Randy;
I guess that means that you think this site is useless for mixing your own fuel? I'm done I won't post helpful info ever again.
Thank-you;
Bill Gruby H^^
If what you say is true about some manufacturers mixing by weight, then all the replies, yours included are guesswork because you really don't know what you have to start with? Yet you chose to quote mine, why is that?
Hi Bill
I wasn't finding fault with you or picking on you, please don't get mad at what I wrote, just re read it, No where in the reply did I suggest you not post anymore . I just stated the facts about fuel, and YES many fuel manufactures DO mix by weight and not volume, matter of fact more do than don't. Reason is Nitro and oil are both much heavier than methanol, so they can make a gallon cheaper than a mix done by volume. They also say it is the way the machines are setup to mix fuel.........
And YES you are correct in stating that all replies including mine are guesswork because we do not know exactly what is in his fuel. That is why I stated to add 10 ounces , it is better to guess a little high than be low on oil with a motor that really needs 28% oil
Regards
Randy
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Maybe some one can help me out with a small problem, I bought a gallon of Powermaster 10 -22 fuel. Ineed 10 -28 how can I get to 28% castor with out lowering nitro to much? Its for a fox 35 Thanks John
John,
It depends on which Powermaster 10-22 fuel you started with. There are two: the "regular" 10-22 which is 11% Castor and 11% Synthetic (which you will never get to 28% all-castor!); and the GMA All-Castor 10-22, which is 22% Castor Oil (This one can be made into 28% All-Castor - Just use the numbers provided by others and add around 10 ounces of Castor Oil). The resulting % of nitro will be reduced from 10% (however it's figured by weight/volume) to around 9.3%, which isn't a noticeable change for anyone!
If I'm guessing correctly, you want the 28% for an old Fox/Johnson/K&B using an iron piston in a steel cylinder, and 28% all-Castor is proper. If the fuel you have is the "regular" 10-22 with 11% Synthetic Oil, save that for the modern stuff, like Brodak or OS LA/FP engines, and go buy a gallon of Powermaster GMA All-Castor 10-29, which is a fine blend for the old engines. This'll save you time and effort, and really won't cost any more in the long run; have you priced AA de-Varnished Castor Oil recently?
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Hi!
I have made an Excel spreadsheet that I have found useful for mixing my own fuel.
The file is 19.5 kB and contains no macros.
You can find it here: homebrewer.xls (http://www.freewebs.com/propellerhead/homebrewer.xls)
Presuming 1 U.S. gallon is 128 fl.oz., using Alt. 2 in my spreadsheet yields the following result:
Add 10.7 fl.oz of oil to increase oil content from 22% to 28% (by volume).
/Michael
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Thanks for all the help ,I have all the info I need. John