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How to mix 35 % & 15 % to = 25% ?


Old 09-13-2015, 06:02 AM
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Default How to mix 35 % & 15 % to = 25% ?

I have a quart of 35% glow fuel that is to hot for my old 1/2 A engines so I need to either mix it with the 15% I have or get some methanol to mix with it to bring the nitro down to about 25% . Please give answers to both ways as I don't know if I'll be able to get methanol, I have castor and synthetic lube to add so please include those amounts with the adding methanol calculation which would be more work but maybe a lot cheaper?

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Old 09-13-2015, 06:46 AM
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If you mix 2 parts 35% with 1 part 15% you'll have 28% nitro. Then add about 4oz oil to get an oil content of about 26% and 26% nitro. That would probably be about perfect as those little engines need more oil anyway. Simple math. My calculations are based on 20% oil base fuels. You'll need to determine the actual oil content of the fuel to make the proper additions.

.35 + .35 + .15 = .85 / 3 = .2833 (28.3%).
.20 * 48 = 9.6 + 4 = 13.6 / 52 = .261 oil content (26.1%) (20% of 48oz base fuel is oil, then divide the base oil content plus added oil content by new volume)
.283 * 48 = 13.58 / 52 = .261 nitro content (26.1%) (take average nitro content of the mix of the two fuels times total volume of base fuel to get nitro amount and divide by new volume to get new nitro content amount)

Hope this makes sense.

Last edited by 1QwkSport2.5r; 09-13-2015 at 06:55 AM.
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