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#31
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mixing gas and oil questions
Steve Lusardi wrote:
Skip, I think we both speak English. I recommended up front to follow the manufacturer's recommendation, they built the motor. However, lube oil mixed with gasoline will lower the auto ignition point of the fuel and it is a contributing risk factor for detonation. You obviously don't believe me, so I invited you to do the research yourself.....you didn't. Instead, you quoted a user manual and you are still talking trash from a point of no knowledge. What is wrong with this picture? Steve "Flying Pig" wrote in message ... From Page 8 of the OMC manual for the 15HP, a 1992j model: To protect your new outboard motor during the intiial hours of operation, and to seat internal engine components, you MUST (emphasis theirs) add extra oil during the break-in period. The fuel/oil ratio for the first 12 gallons must be *25-1* (emphasis theirs). The fuel oil ratio during normal operation, after break-in, must be *50-1* (emphasis theirs). My 6HP manual in hand is just before they went to 100-1 oil. Note that this, a 2005 manual, as the dealer didn't have a current one, is for the normally 50-1 mix engine. My 6 is actually a couple of years later, and the recommended use is for half of that shown above. As mine was a trade-in, it didn't happen to have its original manual, explaining why I'm looking at an older one. It says, on page 15: The fuel/oil ratio for the first 10 hours must be *25-1* (emphasis theirs). The fuel oil ratio during normal operation, after break-in, must be *50-1* (emphasis theirs). HOWEVER... "During high performance opertion you must use a *25-1* fuel/oil ratio in your fuel tank." Now, I agree, OMC is a poor source of information about what to use in their engines for them to warranty them. But until some more authoratative source presents, I'm going with the manual.l NOTHING in it suggests, and, quite the contrary, demands its use, for high performance, that doubling the oil is harmful to the engine. Indeed, high performance seems to me to be more stressful, and, as such, if the assertions that too much oil will melt the aluminum, that the recommendation would be for LESS oil, not doubling it... L8R Skip -- Morgan 461 #2 SV Flying Pig KI4MPC See our galleries at www.justpickone.org/skip/gallery! Follow us at http://groups.google.com/group/flyingpiglog and/or http://groups.yahoo.com/group/TheFlyingPigLog "Believe me, my young friend, there is *nothing*-absolutely nothing-half so much worth doing as simply messing, messing-about-in-boats; messing about in boats-or *with* boats. In or out of 'em, it doesn't matter. Nothing seems really to matter, that's the charm of it. Whether you get away, or whether you don't; whether you arrive at your destination or whether you reach somewhere else, or whether you never get anywhere at all, you're always busy, and you never do anything in particular; and when you've done it there's always something else to do, and you can do it if you like, but you'd much better not." Engines with automatic oil injection systems supply extra oil for hard use such as hole shots for water skiing. The only problems I've seen with too much oil is gummed up plugs. g |
#32
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
"Steve Lusardi" wrote in message
... Skip, I think we both speak English. I recommended up front to follow the manufacturer's recommendation, they built the motor. However, lube oil mixed with gasoline will lower the auto ignition point of the fuel and it is a contributing risk factor for detonation. You obviously don't believe me, so I invited you to do the research yourself.....you didn't. Instead, you quoted a user manual and you are still talking trash from a point of no knowledge. What is wrong with this picture? Steve Hi, Steve, I'm not talking trash - I'm citing owner's manuals. If what the manufacturer puts out as a requirement for warranty on the engine comes across as trash, I'm sorry, but I can't be held responsible :{)) In any event, I don't do high performance, so doubling isn't needed from that perspective. OTOH, in my 100-1 engine, avoiding starvation is of greater concern, and a many-decades old service company has suggested that I'm better safe than sorry - so I use the same mix in both units. And, 18 years later, the 15 is still going strong, though nothing I know of its history, nor my personal use in the last three years, suggests doubling the oil other than on breakin... L8R Skip. -- Morgan 461 #2 SV Flying Pig KI4MPC See our galleries at www.justpickone.org/skip/gallery! Follow us at http://groups.google.com/group/flyingpiglog and/or http://groups.yahoo.com/group/TheFlyingPigLog "Believe me, my young friend, there is *nothing*-absolutely nothing-half so much worth doing as simply messing, messing-about-in-boats; messing about in boats-or *with* boats. In or out of 'em, it doesn't matter. Nothing seems really to matter, that's the charm of it. Whether you get away, or whether you don't; whether you arrive at your destination or whether you reach somewhere else, or whether you never get anywhere at all, you're always busy, and you never do anything in particular; and when you've done it there's always something else to do, and you can do it if you like, but you'd much better not." |
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