hauckf
Posts: 190
Joined: 3/1/2002
From: Decatur,
AL, USA
Status: offline
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N1EDM's reply would be correct if the fuel you were using were Morgan or Wildcat or Coopers or just about any other brand besides Byrons. The fact is, Byrons percentage's for nitro and oil are PERECENT BY WEIGHT, not percent by volume as N1EDM has apparently assumed. Byrons 15% nitro, 16% oil fuel actually contains about 11.3% nitro and 13.9% oil by volume. In other words, if Morgan, Wildcat, Coopers, Powermaster, S&W, Red Max, etc. bottled that same exact fuel, it would be labeled "11.3% Nitro, 13.9% Oil", or thereabouts. To raise the oil percentages of that Byrons fuel to 20% oil BY VOLUME, you would have to add 9.8 fl. oz of castor. The resulting nitro would be about 10.5% by volume (but remember, you only had 11.3% to start with, not 15% as the label pretends). By the way, when engine manufacturers recommend "20% Oil", they mean 20% BY VOLUME, not 20% by weight (I've checked).
As to your question about how much oil to add to a gallon of fuel raise the oil percentage one percentage point (by volume), there is no single answer, as it depends on the starting percentage, but adding 1.6 fl. oz. for each percent you want to raise it will get you darn close!
I built a Microsoft Excel workbook containing several worksheets to do fuel calculations (% by weight to % by volume, adjusting percentages, mixing fuels, etc.). It is in Microsoft Excel. If you (or anyone else) would like a copy, E-mail me direct. You must have MS Excel to use the spreadsheet!
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Best Of Both Worlds - 
