Calling all mental giants for math question

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cyclepro101

cyclepro101

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May 13, 2009
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Can anyone tell me the answer to this question and how they worked it out?

How much fuel do I need to add to 1 litre of 1:20 mix to make up to 1:30?

Steve
 
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matt167

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May 20, 2009
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well 20:1 is 50ml and 30:1 is 33.3ml and with a diffrence of 16.7ml..... so unless my math is wrong, if you add 16.7ml of fuel to your litre of mix, you will end up with 30:1
 
Cabinfever1977

Cabinfever1977

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Mar 23, 2009
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if you are still in breakin i would stick with the 20:1 unless you want to burn up your engine. but if you do kill it they have engine kits with free shipping at zoombicycles.
 
HoughMade

HoughMade

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Apr 15, 2008
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Jim (Creative Engineering) is about right- about 1/2 liter.

Here are the numbers:

1 liter of gas/oil mix at 20:1 (that is, not one liter of gas plus oil, but one liter total of gas and oil) contains:

.04762 liters of oil (47.62ml)
.95238 liters of gas (952.38 ml)

If you have the same amount of oil, 47.62 ml, the how much gas do you add?

Multiply .04762 liters by 30 = 1.4286 liters.

Subtract how much gas there was from how much you need:

1.4286 - .95238 = .47622 liters of gas to add.

It will vary a bit depending on rounding and how many decimals you carry it to.

So, about 1/2 liter, but a little under. If you had 1 liter of gas plus oil at 20:1 (50 ml), you would add exactly 1/2 liter.
 
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HoughMade

HoughMade

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Apr 15, 2008
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Whether you go with 25:1 or 30:1 or whatever, truth be told, this is a useless mathmatical exercise (though it's fun to do simple algebra). Just use up what's left in the can and start with you new mix with the next can you mix up. There's really not an advantage that I can see to going through the hassle of changing the mix of what's in the can. If you expect some sort of noticeable speed increase- you will be diappointed.
 
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