Mixing different fuels

[Kwickkwack]

Look at your first post.

30% 4ltrs = 1.2ltrs nitro [(1.2/4)*100=30%]
20% 4Ltrs = 0.6ltrs nitro [(0.6/4)*100=20%]

Mixed together
8ltrs of fuel containing 1.8lts nitro [(1.8/8)*100=22.5%]

you are calculating a percentage of nitro from an overall volume.

in you diagram example 9(using ltrs as a measure)

Container 1
1ltr nitro + 1ltr methanol [1/2)*100 =50%]
Container 2 2lts methanol 0 nitro [(0/2)*100 = 0%]

Mixed 1litre nito and 3ltrs methanol [(1/4)*100=25%)

This is a VOLUME calculation

In your example you are looking at a ratio of nitro to methanol
i.e. (1/3)*100=33% well close enough.

[unwind-protect]

No it's to demonstrate mixing an already mixed percentage of nitro and methanol to a straight methanol mix giving you equal units in each container. I thought I understood it until now.

Yes, I know.

In container 1 you have 1litre (for argument's sake) of pure nitro, and 1 litre of pure methanol. The ratio is 1:1; the nitro percentage is 50% (1 litre of nitro to 2 litres total volume)

In container 2 you have 2 litres of methanol; a ratio of 0:1 (or 0:2, if you must), and the nitro percentage is 0%.

You put them in a 4 litre bucket, and have 1 litre of nitro and 3 litres of methanol. The ratio is 1:3; the nitro percentage is 25% (1 litre nitro to 4 litres total volume).

Dividing the contents of your bucket into seperate containers isn't going to change the ratios, assuming you mixed it properly!

[Janek]

Scott's added the 12.5% and 30% and divided by 2 to get his 21% approx number, which if my memory of maths from way, way back is correct, cannot be done, do I remember the rule as something like "you CANNOT add percentages" ?

Also his comment about his mix producing the same power as CP30 sounds very unlikely as well, as the nitro content is less. That's assuming that all the manufacturer stuff about nitro increasing power is actually true, and not just a ploy to increase the cost

[Janek]

Anyone remember the song "There's a hole in my bucket Dear Liza, dear Liza" ?

[debrooker]

I think Scott was rounding 21.25% to 21%, but his comments about the same power seem a bit inconsistent with the mix he has ended up with?

but i guess it comes down to how accurately manufacturers mix their solutions and how well people mix theirs..

[waveydavey]

Yes, I know.

In container 1 you have 1litre (for argument's sake) of pure nitro, and 1 litre of pure methanol. The ratio is 1:1; the nitro percentage is 50% (1 litre of nitro to 2 litres total volume)

In container 2 you have 2 litres of methanol; a ratio of 0:1 (or 0:2, if you must), and the nitro percentage is 0%.

You put them in a 4 litre bucket, and have 1 litre of nitro and 3 litres of methanol. The ratio is 1:3; the nitro percentage is 25% (1 litre nitro to 4 litres total volume).

Dividing the contents of your bucket into seperate containers isn't going to change the ratios, assuming you mixed it properly!

I knew someone would come up with the correct description. Thanks for that.

[moyesboy]

Ah but arn't these percentages actually by weight rather than volume? and the SG of nitro is much higher than Methenol? so all these calculations are inaccurate?
...I think we need a chemist like Mojo to tell us

...they do use weight for weight ratios becuase nitro is heavy so they can say its 30% when by volume it is actually less!