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#1
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mixing gas and oil questions
Ted,
Adding lube oil to gasoline lowers the flash point of the fuel increasing the chance of detonation. Oil in the fuel is necessary for these type of engines, but NEVER use more than the manufacturer's recommendation. Failure to follow this simple direction could melt the pistons, the heads and effectively ruin the engine and I have seen this hundreds of times. I know this is counter intuitive, hence the number of times this failure occurs. Steve ted@theted. wrote in message ... i have a jetski and a boat with an evinrude 115 hp outboard. can they both use the same gas/oil mix? someone told me it should be a pint to six gallons but i would rather mix a pint with 5 gallons because it's easier and to be on the safe side if that's ok. is a pint to 5 gallons ok for both the jetski and the evinrude? thanks! ted |
#2
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
"Steve Lusardi" wrote in message
... Ted, Adding lube oil to gasoline lowers the flash point of the fuel increasing the chance of detonation. Oil in the fuel is necessary for these type of engines, but NEVER use more than the manufacturer's recommendation. Failure to follow this simple direction could melt the pistons, the heads and effectively ruin the engine and I have seen this hundreds of times. I know this is counter intuitive, hence the number of times this failure occurs. Steve Interesting. The Outboard Shop, the local evinrude/johnson dealer, gave me the exact opposite recommendation. The question came up with my newer engine which is designed to run on 100-1 mix. They told me it will run just fine on the same stuff as my older engine, a 50-1 mix. They also cautioned me that the least "too-little" mix , such as missing by a bit when filling from a not-empty supply and having to guess at the right amount, could turn it into an anchor. Failure to use enough deprives the engine of its lubrication, and things seize up. Further, my manuals for both engines show to use double the oil in severe use conditions. I.e., in the newer one, 50-1, in the older one, 25-1. More oil, at least as inferred from the manuals, assures that won't happen, even if you overdo it. I grant you that quadrupling the oil may have some deletorious effects, but my common sense tells me that 16% more than specified as ADEQUATE should not be a problem. 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 -- 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." |
#3
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
Lots of trimming
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 There are 2 parameters to consider these are the flash point - the min temp at which it will ignite with a spark or flame etc. This is typically -45F for petrol (gasoline) and +143F for diesel. Hence as a boat fuel, diesel is a lot 'safer' than gasoline. However there is also the autoignition temperature - this is the min temp where the fuel will simply ignite without a spark or flame. For Petrol this is 495F and for diesel 410F a fair bit cooler. So too much oil could lower the auto ignition temp to a point where pre-ignition happens - not good for your engine. However I have no idea how much you need to add to cause this kind of problem. |
#4
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
You can do a test yourself. Place a drop of gasoline down the barrel of a daisy BB gun and fire it....no effect. Use a drop of oil
and you will hear the detonation when the lube oil detonates. Further, try running a diesel engine on high octane gasoline and see what doesn't happen. You may be able to move to 50:1 from 100:1.....maybe, but modern two stroke engines use a lot more compression than the older ones and when using too much oil in the mix, you will melt a piston. Steve "Flying Pig" wrote in message ... "Steve Lusardi" wrote in message ... Ted, Adding lube oil to gasoline lowers the flash point of the fuel increasing the chance of detonation. Oil in the fuel is necessary for these type of engines, but NEVER use more than the manufacturer's recommendation. Failure to follow this simple direction could melt the pistons, the heads and effectively ruin the engine and I have seen this hundreds of times. I know this is counter intuitive, hence the number of times this failure occurs. Steve Interesting. The Outboard Shop, the local evinrude/johnson dealer, gave me the exact opposite recommendation. The question came up with my newer engine which is designed to run on 100-1 mix. They told me it will run just fine on the same stuff as my older engine, a 50-1 mix. They also cautioned me that the least "too-little" mix , such as missing by a bit when filling from a not-empty supply and having to guess at the right amount, could turn it into an anchor. Failure to use enough deprives the engine of its lubrication, and things seize up. Further, my manuals for both engines show to use double the oil in severe use conditions. I.e., in the newer one, 50-1, in the older one, 25-1. More oil, at least as inferred from the manuals, assures that won't happen, even if you overdo it. I grant you that quadrupling the oil may have some deletorious effects, but my common sense tells me that 16% more than specified as ADEQUATE should not be a problem. 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 -- 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." |
#5
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
On Mon, 25 Oct 2010 13:13:49 -0400, "Flying Pig"
wrote: "Steve Lusardi" wrote in message ... Ted, Adding lube oil to gasoline lowers the flash point of the fuel increasing the chance of detonation. Oil in the fuel is necessary for these type of engines, but NEVER use more than the manufacturer's recommendation. Failure to follow this simple direction could melt the pistons, the heads and effectively ruin the engine and I have seen this hundreds of times. I know this is counter intuitive, hence the number of times this failure occurs. Steve Interesting. The Outboard Shop, the local evinrude/johnson dealer, gave me the exact opposite recommendation. The question came up with my newer engine which is designed to run on 100-1 mix. They told me it will run just fine on the same stuff as my older engine, a 50-1 mix. They also cautioned me that the least "too-little" mix , such as missing by a bit when filling from a not-empty supply and having to guess at the right amount, could turn it into an anchor. Failure to use enough deprives the engine of its lubrication, and things seize up. when the evinrude was re-built the mechanic told me to mix 50-1 instead of the regular 25-1 until it got broken in. when i asked if it would hurt to keep mixing it that way all the time he said no. Further, my manuals for both engines show to use double the oil in severe use conditions. I.e., in the newer one, 50-1, in the older one, 25-1. More oil, at least as inferred from the manuals, assures that won't happen, even if you overdo it. I grant you that quadrupling the oil may have some deletorious effects, but my common sense tells me that 16% more than specified as ADEQUATE should not be a problem. that mechanic and the jetski mechanic both said too much is okay but too little will ruin the engine because what you're doing is running it low on oil, which certainly makes sense. Also, I've never seen oil being more subject to explosion/flash than gasoline. How does adding oil to fuel make it more volatile? for real. i've been running the evinrude about 50-1 for about a year and it hasn't blown up or even overheated. one person told me that mixing too much oil makes it have a problem with wanting to quit when you're trying to start it...it will fire up for a few seconds and then die which it is doing. but he may have just said that because he knew i was mixing it heavy on oil. he told me that at a time when we were having the problem. it usually only does it once or twice though, and then runs fine. |
#6
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
Interesting that my comments should have had the group ranting and raving.
Nice, however, to see WH/GH ack their duality, finally, after all the "he's my roommate" and the like denials. Meanwhile, inquiring minds still want to know... Why do outboard manufacturers insist that you run double the oil during breakin, and under severe operating conditions, if it's likely to blow out the pistons as liquid aluminum? Never mind whether or not a certified mechanic can be trusted or whether or not I selectively read. At least one poster has verified doubling the oil during breakin so it stands to reason that it MIGHT be possible that the manual actually says the same about severe operating conditions... L8R Skip, chasing his starting issues, still, report to follow -- 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." |
#7
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
On Tue, 26 Oct 2010 16:54:44 -0400, "Flying Pig"
wrote: Never mind whether or not a certified mechanic can be trusted or whether or not I selectively read. At least one poster has verified doubling the oil during breakin so it stands to reason that it MIGHT be possible that the manual actually says the same about severe operating conditions... I don't think so. That's when you're likely to experience pre-ignition/detonation due to the lowered self ignition temperature of the fuel mix. |
#8
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
"Wayne.B" wrote in message
... On Tue, 26 Oct 2010 16:54:44 -0400, "Flying Pig" wrote: Never mind whether or not a certified mechanic can be trusted or whether or not I selectively read. At least one poster has verified doubling the oil during breakin so it stands to reason that it MIGHT be possible that the manual actually says the same about severe operating conditions... I don't think so. That's when you're likely to experience pre-ignition/detonation due to the lowered self ignition temperature of the fuel mix. Duh! Increasing the oil to fuel ratio does not lower the self-ignition temperature. It raises it. We are not talking diesel engines here. We are talking two-stroke gasoline engines with their relatively low compression ratios. Try running a two-stroke (two-cycle) engine on pure two-stroke oil and they won't self ignite to combustion EVER! Even a spark plug won't make the thing fire. Try running them on half and half gas and oil and they might just barely run given a source of ignition like a spark plug before it fouls with oil in about a minute but they won't self-ignite EVER. Try running them on nothing but gasoline and they will have a much higher likelihood of self-ignition (aka detonation, knock or ping) for about a minute before the piston seizes to the cylinder wall. I hate like hell to say it but SKIPPY IS CORRECT. Increasing the oil to fuel ratio will not damage the engine from detonation, etc. Wilbur Hubbard |
#9
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
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." |
#10
posted to rec.boats,rec.boats.building,rec.boats.cruising
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mixing gas and oil questions
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." |
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