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ISAAC EISENMAN (Tropicjungleboy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 23, 2005 - 10:31 pm: | 
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to have a clear view about the gasoline and oil mixture goes this explanation.....
one u.s. gallon equal 128 onz
so 50:1 mixture equal 50 parts of gasoline per one part oil....128 onz( one u.s. gallon) / 50.....2.56 onz of oil per one u.s. gallon of gasoline.
20:1 mixture equal 20 parts of gasoline per one part of oil.....128 onz ( one u.s. gallon)/20......6.4 onz of oil per one u.s. gallon of gasoline
about type of oil to be use to mix with gasoline
on '70 ( where most of aatv where fitted with two cycle engine ) the choice was sae 30 motor oil...
today we can found two cycle oil ( outboard motor two cycle oil)....on two version
ll and lll........the "lll" offer less ashes, better lubrication and less spark plug fouling.
synthetic two cycles oil.........better general performance at .$$$$$$more money!!!!
warning: the muffler's smoke isn't the rigth way to know if gasoline/oil ratio is ok....the reason is simple..
* different brand of oil produce diference on quantity of "oil smoke"
* ambiance temp + engine working temp produce diferent muffler's oil smoke....
so is better to have a measured cup to performance on aatv tank the "right" gasoline/oil mixture...a good practice is to put first the oil, on a gallon to gallon basis...that way you can go "over oiled" instead of "under oiled" mixture...i don't know a two cycle engine damage to over oiled!!!!!!
hope that this post keep more aatv equiped with two cycle engines bouncing better!!!!!!!!! |
mr. tinker
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 23, 2005 - 10:31 pm: |
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if you increase the amount of oil in a two cycle fuel mix you will lean out the mixture.if you decrease the oil amount in the fuel mix you will richen the mixture. the oil is not part of the power producing reaction in the cylinder.the oil is for lubrication.therefore increasing the oil in the fuel mix decreases the amount of fuel that enters the cylinder.the best advice for fuel/oil ratio is what the engine manufacturer recommends.as always if there are other things that are not right on the engine it may run at a different ratio than recommended. |
ISAAC EISENMAN (Tropicjungleboy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 23, 2005 - 10:31 pm: |
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hey mr.tinker: you better reformulate your statement....ANYTHING ( gasoline/oil/air/dirt/humidity/oxigen/...) that goes inside the combustion chamber ( the space between top of piston and cylinder head) is part and therefore affect the power..on the oil factor the "burnability" factor matter....for example shyntetic "burns" easier than lll two cycle oil but lll burns easier than sae 30 motor oil...... i also agree that is a high risk choice to reduce ammount of oil( increase gasoline parts per oil parts ratio) than specifyed by engine manufacter....so bottom line is that a good quality "easy burnable" oil will performances better on two cycles engines..
on low "burnable" oils ( when sae 30 motor oil is used) an easy solution to avoid fouled spark plug is to get a "hotter" spark plug.....two cycle aatv bounce better on the right fuel/oil ratio!!! |
roadwolf
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 23, 2005 - 10:31 pm: |
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hey ike, tinker iz right when he saz more oil produces a leaner mixture. same amount of air passes through tha carb, but more volume of oil leaves a smaller amount of gas, therefore a greater air/fuel ratio.
i know at first it's kinda of a weird science, but i learned it tha hard way back in my mx days, don't believe me, check out my toolbox full of carb jets and needles, lol. |
tj
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 23, 2005 - 10:31 pm: |
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isaac and tinker are both right, when you increase the amount of oil in the fuel, it lean's out your fuel/air mixture. some oil's will also produce more power than other's, but i can't type quick enough to go into that story, to explain all of the assciated factor's would take me all night at the rate i type. though i will throw this out there for you to think about. the oil, cup cars use for qaulifing, has almost no viscosity. |
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