Toying with the idea of blending my own fuel, need tips
#1
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Toying with the idea of blending my own fuel, need tips
Fuel's pretty cheap for me, 25 bucks a gallon or so, but I'm still considering blending my own as obtaining it requires driving 25-30 miles. I've got two applications, a .18ci car that runs best on 20%, and a .46ci plane that runs fine on 10-15%. I want to blend two fuels, obviously.
Car fuel: 20%N, 15% O(75/25 synthetic/castor blend to keep the mess down)
Plane fuel: 15%N, 18% O(72/25 castor/syn, reversed from the car fuel, as it's not going to collect half of Tennessee on the undercarriage)
I need to know yall's thoughts on these blends, as well as where in the Nashville, TN area I could obtain the ingredients.
Car fuel: 20%N, 15% O(75/25 synthetic/castor blend to keep the mess down)
Plane fuel: 15%N, 18% O(72/25 castor/syn, reversed from the car fuel, as it's not going to collect half of Tennessee on the undercarriage)
I need to know yall's thoughts on these blends, as well as where in the Nashville, TN area I could obtain the ingredients.
#2
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: 378
Fuel's pretty cheap for me, 25 bucks a gallon or so, but I'm still considering blending my own as obtaining it requires driving 25-30 miles. I've got two applications, a .18ci car that runs best on 20%, and a .46ci plane that runs fine on 10-15%. I want to blend two fuels, obviously.
Car fuel: 20%N, 15% O(75/25 synthetic/castor blend to keep the mess down)
Plane fuel: 15%N, 18% O(72/25 castor/syn, reversed from the car fuel, as it's not going to collect half of Tennessee on the undercarriage)
I need to know yall's thoughts on these blends, as well as where in the Nashville, TN area I could obtain the ingredients.
Fuel's pretty cheap for me, 25 bucks a gallon or so, but I'm still considering blending my own as obtaining it requires driving 25-30 miles. I've got two applications, a .18ci car that runs best on 20%, and a .46ci plane that runs fine on 10-15%. I want to blend two fuels, obviously.
Car fuel: 20%N, 15% O(75/25 synthetic/castor blend to keep the mess down)
Plane fuel: 15%N, 18% O(72/25 castor/syn, reversed from the car fuel, as it's not going to collect half of Tennessee on the undercarriage)
I need to know yall's thoughts on these blends, as well as where in the Nashville, TN area I could obtain the ingredients.
I've been making my own fuel for over a year. There are numerous other threads on the subject around the forum, so look around. The hardest part is finding methanol. I bought mine from a local oil company. For what you're paying for pre-mix, it will cost you about the same or a little less to mix your own. Castor oil is half the price of the average synthetics and synthetic blends. For this reason I run all castor in my car engines and my airplane engines. Airplane fuel around me is $32 a gallon and car fuel is about $34 a gallon. My homebrew airplane fuel is $10-12 a gallon, and my car fuel is $18-20 per gallon. I use 20% nitro/12% oil in the cars and 5% nitro/20% oil in my airplane engines. My engines run significantly better on my homebrew fuel than off the shelf fuel.
#3
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My Feedback: (4)
RE: Toying with the idea of blending my own fuel, need tips
I want to try to keep the castor to a minimum in my car because if I run the stuff I end up with half of Tennessee glued to the side of the engine, exhaust, right rear tire/suspension, inside of the shell, air filter housing, carb, pull starter, diff case, chassis, and pretty much every other part from the stinger back that doesn't spin fast enough to sling the stuff off. It's horribly annoying to clean. Synthetic burns, so it won't collect quite as much nitro mud after an hour's run. I'd love to run a pure synthetic blend but these engines do like a little castor, and my after-run procedure consists entirely of running it out of fuel, setting it to BDC and plopping it up on the shelf.
I'll thumb through that thread and see what I can find out there.
I'll thumb through that thread and see what I can find out there.
#4
RE: Toying with the idea of blending my own fuel, need tips
I totally understand the synthetic/castor bit. I personally don't want to pay for the $50 a gallon oil. The oil is as much or more than the nitro. In my cars, I don't see much more mess than with the blended oils. Running 12% castor allows a leaner mixture which means less oil out the muffler.
My Mach 427 lst2 gives up wheelies on my 20% homebrew, but took 25% nitro premixed to give wheelies.
My Mach 427 lst2 gives up wheelies on my 20% homebrew, but took 25% nitro premixed to give wheelies.
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RE: Toying with the idea of blending my own fuel, need tips
If you compare premixed with homebrew there is a difference in how they measure the nitro. Premix with 25% by weight will be somewhere around 20% by volume depending on what oil is in the premix and how much.
Density:
Methanol=0,79g/ml
Nitro=1,138g/ml
Oil=0,9-0,99g/ml
Density:
Methanol=0,79g/ml
Nitro=1,138g/ml
Oil=0,9-0,99g/ml
#6
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: Nitrovein
If you compare premixed with homebrew there is a difference in how they measure the nitro. Premix with 25% by weight will be somewhere around 20% by volume depending on what oil is in the premix and how much.
Density:
Methanol=0,79g/ml
Nitro=1,138g/ml
Oil=0,9-0,99g/ml
If you compare premixed with homebrew there is a difference in how they measure the nitro. Premix with 25% by weight will be somewhere around 20% by volume depending on what oil is in the premix and how much.
Density:
Methanol=0,79g/ml
Nitro=1,138g/ml
Oil=0,9-0,99g/ml
#7
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RE: Toying with the idea of blending my own fuel, need tips
Well there is a difference in calculate and measure, I don´t know how they measure. Some fuel manufacturer sell both way, but on the fuel calculated by volume they advice that you use colder plug and re-shim the head.
When mixing your own fuel I would like to think volume is the easier way to go. But when comparing fuel "A" to "B", it doesn't hurt to know that there is a difference.
When mixing your own fuel I would like to think volume is the easier way to go. But when comparing fuel "A" to "B", it doesn't hurt to know that there is a difference.
#8
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: Nitrovein
Well there is a difference in calculate and measure, I don´t know how they measure. Some fuel manufacturer sell both way, but on the fuel calculated by volume they advice that you use colder plug and re-shim the head.
When mixing your own fuel I would like to think volume is the easier way to go. But when comparing fuel ''A'' to ''B'', it doesn't hurt to know that there is a difference.
Well there is a difference in calculate and measure, I don´t know how they measure. Some fuel manufacturer sell both way, but on the fuel calculated by volume they advice that you use colder plug and re-shim the head.
When mixing your own fuel I would like to think volume is the easier way to go. But when comparing fuel ''A'' to ''B'', it doesn't hurt to know that there is a difference.
I have never heard anyone say to use a colder plug and shim the head when using fuel mixed by volume. Considering no fuel company comes right out and says which method they use, I can't see this as being common practice.. at least not here in the U.S. If you have a link to some information talking about this, please post it. I'd like to read into it a little.
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RE: Toying with the idea of blending my own fuel, need tips
As you say, in the U.S. I believe the standard is by weight and in Europe by volume (in general). But even if most engine brands come from Europe, most of the fuel come from the U.S.
I unfortunately can not find more than one brand at the moment and that site seems down for the night... http://www.gt-racing.de/ I will get back when my memory serves me better.
But if we toy with the idea of mixing fuel with 25% Nitro and 10% Oil, and use a density of 0,79g/ml for methanol, 0,95g/ml for oil and 1,138g/ml for nitro then that would look like this:
1000gram = 1147,72ml
Methanol 65% =650g = 822,8ml or 71,69% by volume
Nitro 25% =250g = 219,68ml or 19,14% by volume
Oil 10% =100g = 105,26ml or 9,17% by volume
1000ml = 893gram
Methanol 65% =650ml = 513,5g or 57,5% by weight
Nitro 25% =250ml = 284,5g or 31,85% by weight
Oil 10% =100ml = 95g or 10,63% by weight
But as you say, they probably don´t mix oil by weight, my guess is on the heavy expensive ingredient.
I unfortunately can not find more than one brand at the moment and that site seems down for the night... http://www.gt-racing.de/ I will get back when my memory serves me better.
But if we toy with the idea of mixing fuel with 25% Nitro and 10% Oil, and use a density of 0,79g/ml for methanol, 0,95g/ml for oil and 1,138g/ml for nitro then that would look like this:
1000gram = 1147,72ml
Methanol 65% =650g = 822,8ml or 71,69% by volume
Nitro 25% =250g = 219,68ml or 19,14% by volume
Oil 10% =100g = 105,26ml or 9,17% by volume
1000ml = 893gram
Methanol 65% =650ml = 513,5g or 57,5% by weight
Nitro 25% =250ml = 284,5g or 31,85% by weight
Oil 10% =100ml = 95g or 10,63% by weight
But as you say, they probably don´t mix oil by weight, my guess is on the heavy expensive ingredient.
#10
RE: Toying with the idea of blending my own fuel, need tips
The only commercial fuel that was found to be mixed by weight (from evaporation tests) was Byron but that was many years ago so it's possible they're doing it differently now and not short changing on oil and nitro percentages. Mixing by weight is certainly the more accurate way to commercially blend fuels on the proviso that the end result is equivalent to a fuel mixed by volume at a standard temperature (in America this would have been 60F). For home blending there's no need to complicate the process by using weight because no one blends at temperatures that would have any noticeable effect on the final volumes of each component.
#11
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: Nitrovein
As you say, in the U.S. I believe the standard is by weight and in Europe by volume (in general). But even if most engine brands come from Europe, most of the fuel come from the U.S.
I unfortunately can not find more than one brand at the moment and that site seems down for the night... http://www.gt-racing.de/ I will get back when my memory serves me better.
But if we toy with the idea of mixing fuel with 25% Nitro and 10% Oil, and use a density of 0,79g/ml for methanol, 0,95g/ml for oil and 1,138g/ml for nitro then that would look like this:
1000gram = 1147,72ml
Methanol 65% =650g = 822,8ml or 71,69% by volume
Nitro 25% =250g = 219,68ml or 19,14% by volume
Oil 10% =100g = 105,26ml or 9,17% by volume
1000ml = 893gram
Methanol 65% =650ml = 513,5g or 57,5% by weight
Nitro 25% =250ml = 284,5g or 31,85% by weight
Oil 10% =100ml = 95g or 10,63% by weight
But as you say, they probably don´t mix oil by weight, my guess is on the heavy expensive ingredient.
As you say, in the U.S. I believe the standard is by weight and in Europe by volume (in general). But even if most engine brands come from Europe, most of the fuel come from the U.S.
I unfortunately can not find more than one brand at the moment and that site seems down for the night... http://www.gt-racing.de/ I will get back when my memory serves me better.
But if we toy with the idea of mixing fuel with 25% Nitro and 10% Oil, and use a density of 0,79g/ml for methanol, 0,95g/ml for oil and 1,138g/ml for nitro then that would look like this:
1000gram = 1147,72ml
Methanol 65% =650g = 822,8ml or 71,69% by volume
Nitro 25% =250g = 219,68ml or 19,14% by volume
Oil 10% =100g = 105,26ml or 9,17% by volume
1000ml = 893gram
Methanol 65% =650ml = 513,5g or 57,5% by weight
Nitro 25% =250ml = 284,5g or 31,85% by weight
Oil 10% =100ml = 95g or 10,63% by weight
But as you say, they probably don´t mix oil by weight, my guess is on the heavy expensive ingredient.
5% nitro by weight is 5.6oz = 168ml
20% castor (using .96g/ml) by weight is 22.46oz = 674ml
and 75% methanol by weight is 84oz = 2520ml
Added up = 3362ml.
1 Gallon = 128fl oz = 3840ml
My homebrew 5% nitro 20% castor 75% methanol mixed by volume yields 6.4oz nitro, 25.6oz oil, and 96oz methanol. Their weights as a percentage respectively would be 7.6%, 23%, and 69.9% Which ends up being just a tad over a gallon (128.64oz)
I hate converting from imperial to metric measurements since theres a great deal of fractions so I did some rounding to simplify things a little.
I probably overthought this, but in hindsight, it is far easier to mix by volume. If one needs to be dead-on exact, then mixing by weight is a better route. As I said before, my engines havent been all that picky up to this point with what I've ran through them so I'll keep doing what I've been doing.
My homebrew 20% nitro 12% castor 68% methanol by volume = 25.8%, 13.07%, and 61.06% by weight respectively.
Give or take a little.
#12
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: downunder
The only commercial fuel that was found to be mixed by weight (from evaporation tests) was Byron but that was many years ago so it's possible they're doing it differently now and not short changing on oil and nitro percentages. Mixing by weight is certainly the more accurate way to commercially blend fuels on the proviso that the end result is equivalent to a fuel mixed by volume at a standard temperature (in America this would have been 60F). For home blending there's no need to complicate the process by using weight because no one blends at temperatures that would have any noticeable effect on the final volumes of each component.
The only commercial fuel that was found to be mixed by weight (from evaporation tests) was Byron but that was many years ago so it's possible they're doing it differently now and not short changing on oil and nitro percentages. Mixing by weight is certainly the more accurate way to commercially blend fuels on the proviso that the end result is equivalent to a fuel mixed by volume at a standard temperature (in America this would have been 60F). For home blending there's no need to complicate the process by using weight because no one blends at temperatures that would have any noticeable effect on the final volumes of each component.
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RE: Toying with the idea of blending my own fuel, need tips
Not sure how you´re thoughts went on that one... If you have 128fl oz in a jug, then 128fl oz is 100%.
Anyhow, I don´t think most people care about these things. But for me it came hand in hand with mixing my own fuel, toying with numbers.
But what´s worth thinking about is that if you have say 200ml in a tank, then you´re fuel will be the methanol % of that 200ml, the rest is lube etc. (VERY simplified)
When someone say that their new fuel will make you go 1min extra, then there is most likely (not certain) more methanol in that fuel. (Again, VERY simplified)
Nitro sure is cheap in U.S. I pay 170$ a gallon... [] I think that I should go through the hassle of mixing by weight.
Anyhow, I don´t think most people care about these things. But for me it came hand in hand with mixing my own fuel, toying with numbers.
But what´s worth thinking about is that if you have say 200ml in a tank, then you´re fuel will be the methanol % of that 200ml, the rest is lube etc. (VERY simplified)
When someone say that their new fuel will make you go 1min extra, then there is most likely (not certain) more methanol in that fuel. (Again, VERY simplified)
Nitro sure is cheap in U.S. I pay 170$ a gallon... [] I think that I should go through the hassle of mixing by weight.
#14
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: Nitrovein
Nitro sure is cheap in U.S. I pay 170$ a gallon... [] I think that I should go through the hassle of mixing by weight.
Nitro sure is cheap in U.S. I pay 170$ a gallon... [] I think that I should go through the hassle of mixing by weight.
Nitromethane is not as easy to get as it used to be so I hear, some idiots like to make bombs with it or something. All these hazmat regulations really put a crimp in the hobby. Thats why model engine fuel in my area is $32-$38 per gallon (US).
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RE: Toying with the idea of blending my own fuel, need tips
Unfortunately it is U.S. $. I think one problem is that it´s not allowed here to have larger canisters than 1liter with nitro at home, larger quantity would be cheaper to buy. (1liter=300Skr/$45)
But, there are ways to get it cheaper, but no where near the U.S. price.
But, there are ways to get it cheaper, but no where near the U.S. price.
#16
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: Nitrovein
Unfortunately it is U.S. $. I think one problem is that it´s not allowed here to have larger canisters than 1liter with nitro at home, larger quantity would be cheaper to buy. (1liter=300Skr/$45)
But, there are ways to get it cheaper, but no where near the U.S. price.
Unfortunately it is U.S. $. I think one problem is that it´s not allowed here to have larger canisters than 1liter with nitro at home, larger quantity would be cheaper to buy. (1liter=300Skr/$45)
But, there are ways to get it cheaper, but no where near the U.S. price.
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RE: Toying with the idea of blending my own fuel, need tips
That´s very kind that you want to help a less fortunate modeler. I will send you a Pm and explain my situation a little better.
#18
RE: Toying with the idea of blending my own fuel, need tips
ORIGINAL: Nitrovein
That´s very kind that you want to help a less fortunate modeler. I will send you a Pm and explain my situation a little better.
That´s very kind that you want to help a less fortunate modeler. I will send you a Pm and explain my situation a little better.