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mixing gas and oil questions
"Ron" wrote in message
news  On Mon, 25 Oct 2010 14:23:46 -0400, I am Tosk wrote: In article 29b625b4-9ffe-4736-b512-dff137d6aa81 , says... haven't figured out what it was, but I shipped it: Also, I've never seen oil being more subject to explosion/flash than gasoline. How does adding oil to fuel make it more volatile? L8R Skip Your comment and question shows a basic lack of fuel and combustion concept understanding. Yeah, I gathered he isn't a internal combustion engineer so what's your point? I worked on cars for a long time and really never thought about ping as it relates to two stroke fuel/oil mix, I just mix it right  andwith the octane we run, ping is not really an issue.. As to why the high mixture and why it would cause ping, I have some ideas, but really, I don't think it's all that important as long as I have a measuring cup... That being said in my lawn equipment and boats I run regular fuel with Spectro32:1 which is designed to run at that mixture in most two stroke engines.. It's universal. No it isn't! Water cooled outboards run at much lower temps than air cooled lawn equipment. The requirements for the oil are quite different. And 32:1 will cause an engine that is designed for 50:1 to run lean. Not good! It's apparent you don't understand what the ration you used means. 32:1 means 32 parts gasoline to one part oil 50:1 means 50 parts gasoline to one part oil Therefore, you are wrong to say 32:1 will burn leaner than 50:1. Fifty to one burns leaner by virtue of the fact that there is more gasoline to burn and less oil. A richer oil/gasoline ratio (more oil to gas as in 32:1) will cause a two-stroke engine to run richer - not leaner. Oil also burns (most of it) but oil burns less easily and more slowly (under the compression ratios present in gasoline engines) because it's less combustible than gasoline. It takes a high compression, diesel engine to burn oil efficiently. It ain't gonna happen efficiently in a gasoline engine because of the low compression ratios Wilbur Hubbard |
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