Posted by JML755 on March 09, 2010 at 05:18:10 from (66.184.63.110):
In Reply to: Ratio of 2 cycle oil posted by 135 Fan on March 08, 2010 at 07:58:19:
What I find interesting about this whole subject is the math. Why do mfrs specify fuel ratios at certain values? Why 50:1 and not 48.5:1?
If you calculate it, the difference in a 50:1 and 40:1 ratio in a gallon of gas (which is how most of us pre-mix our 2-cycle fuel) is .64 oz, or just under half a jigger of oil. Getting the correct ratio also assumes that you have EXACTLY 128 oz of gas in that container. (It might be 120 oz or 140 oz. unless the can was completely empty (dry) when you filled it at a gas station and put EXACTLY 1.0 gals in it.)
What I'm saying is that I doubt most of the people who use 2-cycle equipment can positively state that they are mixing fuel/oil to the exact ratio spec'ed by the mfr. The newer 2-cycle oil bottles that you squeeze to get the right amount in the top section DO make it easier to measure the oil. but how much sticks to the side when you pour it out? If you're doing it in the winter, I'm sure more than when you're doing it in the summer.
I would also bet that any 2-cycle engine mfr whose chief engineer says he wants a 48.215 fuel/oil ratio will be overruled and be told to use 50:1 in the owners manual.
That being said, I have different 1 gal containers with the fuel/oil ratio written on the side for my 50:1 and 40:1 equipment. But, if one container ran out I would not hesitate to use the other one to get me by to finish a job.
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