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Old 03-31-2007, 02:04 PM   #1 (permalink)
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Default How to measure meth/water mix?

I'm trying to figure out what the best way to get a 75/25 meth/water mix.

I have VP racing methanol, and i am trying to make a mix tonight,

any advice?
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Old 03-31-2007, 02:14 PM   #2 (permalink)
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Quote: Originally Posted by FSRbikr98
I'm trying to figure out what the best way to get a 75/25 meth/water mix.

I have VP racing methanol, and i am trying to make a mix tonight,

any advice?

either a measuring cup or a weighing scale

cup is the easier method

http://www.ashland.com/pdfs/technica...sh%20Point.pdf

methanol has real low surface tension/viscosity, it will "pour and splash" everywhere except where you want to get it into
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Old 03-31-2007, 02:17 PM   #3 (permalink)
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btw use distilled water from the grocery store
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Old 03-31-2007, 02:18 PM   #4 (permalink)
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yes the distilled water is a must, and i figured a measuring cup would do the trick but i just wanted to be accurate.

Thanks for the help
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Old 03-31-2007, 02:20 PM   #5 (permalink)
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I'm trying to read the PDF you posted, and i do not quite understand the values. It says meth/water mixture, and % by either, can u explain how its calculated?
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Old 03-31-2007, 03:17 PM   #6 (permalink)
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methyl alcohol = 0.791g/cc
water = 1.0g/cc

using measuring cup - 1000cc basis:

750ccMeOH + 250ccH2O = 1000cc
750/1000 = 75 v/v% methanol in the methanol/water mix

density = mass/volume

0.791 = mass/750
mass = 593.25gms methanol in the above 75 v/v% methanol/water mix

593.25gms methanol + 250gms water (water = 1.0gm/cc) = 843.25gms

593.25/843.25 = 70 w/w% methanol

therefore, 75 volume percent methanol in water = 70 weight percent methanol in water
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Old 03-31-2007, 05:55 PM   #7 (permalink)
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ok so if i do 1 cup of water and 3 cups of meth what percent am i looking at

holy shit i wasnt that great in math, but damn dude i dunno wtf is that up there haha. I believe the lower portion of that equation is if i'm measuring the meth out using a scale correct?
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Old 03-31-2007, 07:33 PM   #8 (permalink)
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3 cups methanol + 1 cup water is what you need to get your 75/25 methanol/water mix
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Old 03-31-2007, 08:41 PM   #9 (permalink)
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ok thanks man, thats a good bit of info you posted there.
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Old 02-17-2009, 10:03 PM   #10 (permalink)
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Ok but i heard you have to messure by WEIGHT, not volume? I use to mix one gallon water one gallon meth, 50/50 right??? WRONG, from what i was told water weighs more so that ='s one gallon water, one gallon meth, you have more water density than meth. So its not really a 50/50. This is sooo confusing, So now i do gallon water gallon meth and i have a line on the gallon jug i use. its about 1/4 of the gallon jug, Got no clue how close it is to 5050 but i belive im close may be more 40-60 but i mix it the same every time so my tune is good. Runs good whatever mix im mixing lol. But still dont understand the facts on the proper way to mix it.
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Old 02-19-2009, 12:07 AM   #11 (permalink)
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I don't think your car is gonna care whether you go by weight or volume, as long as you stick to what you are doing. Especially after you are tuned. Just make sure that whatever dance you do you do it again so that the results are the same.
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Old 02-19-2009, 08:56 AM   #12 (permalink)
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Best to do it be volume. Thats even what all the shippers care about. If we mixed our devilsown brew by volume of 50/50 we would need to ship it hazmat.
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Old 02-19-2009, 01:24 PM   #13 (permalink)
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volume not weight, So a gallon of water and a gallon of meth mixed is 50/50? Why am i told thats not really a 50/50 mixture?
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Old 02-19-2009, 01:24 PM   #14 (permalink)
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Cause teh gallon of water will weigh more than the meth gallon.
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Old 02-19-2009, 03:35 PM   #15 (permalink)
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Methanol weight 6.63 lbs/US gallon

Water weights 8.3436 lbs/US gallon

So its closest to a 3/4 ratio, For lack of making it easy to mix. Your more than welcome to break out the scale and do it that way.

Most in the fluid world will say it needs to be done by weight. When we recomend a 50/50 we mean volume just because of the ease of mixing. Its what most eveyone runs and it runs well.
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