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  1. #1
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    Mixing water / methanol by weight

    So I've been trying to come up with an easy way to mix a 60% methanol solution by weight.
    This is what I'm thinking..
    pure methanol is 6.63 lbs per gallon
    pure water is 8.3453 lbs per gallon
    6.63 x .6 = 3.978 lbs methanol
    8.35 x .4 = 3.34 lbs of water

    I mix using oz for weight using a digital scale to keep it as accurate as possible, but is this a true 60/40 mix be weight?

    anyone have a spreadsheet for mixing meth by weight?

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    I have a spreadsheet somewhere ill email it to you.
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    I have a spreadsheet somewhere ill email it to you.
    Awesome man thanks.

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    Sent
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


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    Got it, thanks again. Much easier.

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    No prob
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


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    2 out of 2 members liked this post. Yes Reputation No
    Basically meth weighs 80% of water.

    Just use this proportion in a simple conversion calculation.

    If you want a 60/40 mix by weight, then just take the answer you get for the 40% meth proportion and divide it by 0.8 to calculate the volume of meth you should mix in order to convert it into the equivalent weight of water.

    For example......if you start with 1 gallon of 60/40 mix based on volume, you would pour 0.6 gallons of water and then add 0.5 gallons of meth to get a 60/40 ratio by weight and not volume.

    You end up with a total of 1.1 gallons (or 60/50) based on volume....but it is actually a 60/40 mix when based on weight.

    I easily calculated the 0.5 gallons of meth by taking the 40% portion of the desired mix above.....and dividing it by 0.8 to convert meth into the same weight as water.


    So no matter what mix you choose.....say 70/30, just divide your meth percentage by 0.8 to know how much volume of meth you need to mix in order to create a true mix based on weight. In this case 30% divided by 0.8 = 37.5% of meth and 70% of water.

    These would be the relative volumes you would pour to get a true 70/30 mix.

    Always use the percentage of water as your constant and use the fact that meth weighs 80% of water.



    And yes......I spend far too much time analyzing things.

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    Are you near a Target store? If it's easier for you, Target sells -20F splash WW fluid that has 31% methanol content in Florida for $1.59 (about the same price as some distilled water) that I use to mix 50/50 by volume with 99.9% pure meth (which comes to 63/37 ratio by weight per my calculations).

    If you mix 1/3 gallon -20F and 2/3gallons 99.9% pure meth, it comes to a 74/26 ratio.
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    Click here to enlarge Originally Posted by spool twice Click here to enlarge
    Are you near a Target store? If it's easier for you, Target sells -20F splash WW fluid in Florida for $1.59 (about the same price as distilled water) that I use to mix 50/50 by volume with 99.9% pure meth (which comes to 63/37 ratio by weight per my calculations).
    Thats a really good idea, ive got a few target stores local to me. I was mixing -20 splash with 4 bottles of heet previously, this time i wanted to try mixing pure meth and h2o but the ww fluid plus meth seems like an easy way to save some cash. Thanks!

  10. #10
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    @DCAFS, great info, thanks for sharing.

  11. #11
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    Click here to enlarge Originally Posted by spool twice Click here to enlarge
    Are you near a Target store? If it's easier for you, Target sells -20F splash WW fluid that has 31% methanol content in Florida for $1.59 (about the same price as some distilled water) that I use to mix 50/50 by volume with 99.9% pure meth (which comes to 63/37 ratio by weight per my calculations).

    If you mix 1/3 gallon -20F and 2/3gallons 99.9% pure meth, it comes to a 74/26 ratio.
    I would be concerned what the other 69% is in that WW Fluid. Why not just use 99.9% meth with distilled water?
    2011 335is DCT, JB4 + MHD BEF, stage 2 LPFP, e50 + 50/50 meth, FBO, MT ET Streets when needed


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    or tap water




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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    I would be concerned what the other 69% is in that WW Fluid. Why not just use 99.9% meth with distilled water?
    The other 69% is basically just water with some coloring added to it. I try to use WW fluid every once in a while just to keep the meth/water mix a little blue in color. It makes it really easy to see it in the lines.

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    so.. if you have a 2.5 gallon tank, 2 gallons of 100% M1 meth, the rest -20 WW fluid, whats that come out to?

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    Click here to enlarge Originally Posted by LostMarine Click here to enlarge
    so.. if you have a 2.5 gallon tank, 2 gallons of 100% M1 meth, the rest -20 WW fluid, whats that come out to?
    Should be ~84% by weight, ~87% by volume.

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    Wow, you guys are anal! Just run what works best for you and remember your ratio in volume. It's way easier and just as good.

  17. #17
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    Moved to General Automotive / Tuning.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

  18. #18
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Moved to General Automotive / Tuning.
    Why in the world did you move this under the American car section?
    2011 E90 M3 \ Melbourne Rot Metallic

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  19. #19
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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    Why in the world did you move this under the American car section?
    Because I accidentally clicked the wrong forum. It happens.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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  20. #20
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Because I accidentally clicked the wrong forum. It happens.
    Just F'in with you man, i could care less where it goes.
    2011 E90 M3 \ Melbourne Rot Metallic

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    Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
    Just F'in with you man, i could care less where it goes.
    Then I'm moving it back just because I can.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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