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mixing gas and oil questions
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 |
mixing gas and oil questions
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 It's always wise to follow manufacturers recommendations. Deviating from them could be trouble. Wilbur Hubbard |
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 |
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." |
mixing gas and oil questions
WARNING WARNING WARNING WARNING WARNING WARNING
WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING Interesting. *The Outboard Shop, the local evinrude/johnson dealer, gave me the exact opposite recommendation....... Fact: people forget 50% of what they hear immediatly. In other words SKip you probablly heard, "bla bla bla recomend bla bla evenrude bla..." Further, my manuals for both engines show ........ Gaaaaa you have to comprehend also my selective reader. I grant you that quadrupling the oil may have some deletorious effects, but my common sense tells me........ should not be a problem. Hey sikp have you been using your BrontoThesaurus again ? Please dont use such big words as deletorius. They sont have a Salubrious effects on my comprehension. 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. Will those here more knowledgable please inlighten SKip. Im off to watch the 30 foot 17 second swells hit the jetty. Robert RExroth (Dell Tech Support-SLC, UT) ADA |
mixing gas and oil questions
"Bob" wrote in message
... WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING Interesting. The Outboard Shop, the local evinrude/johnson dealer, gave me the exact opposite recommendation....... Fact: people forget 50% of what they hear immediatly. In other words SKip you probablly heard, "bla bla bla recomend bla bla evenrude bla..." Further, my manuals for both engines show ........ Gaaaaa you have to comprehend also my selective reader. I grant you that quadrupling the oil may have some deletorious effects, but my common sense tells me........ should not be a problem. Hey sikp have you been using your BrontoThesaurus again ? Please dont use such big words as deletorius. They sont have a Salubrious effects on my comprehension. 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. Will those here more knowledgable please :: inlighten SKip. Im off to watch the 30 foot 17 second swells hit the :: jetty. I think Mr. Grundlach may be correct for once. Adding more oil to a given amount of gasoline actually acts as an anti-knock ingredient. It lowers the rate of speed at which the flame front propagates from source of ignition (spark plug) to cylinder/piston surfaces. It increases the duration of the burn and thus lowers the temperature of the burn. Add too much oil and the motor will run as if the choke were on. I don't know of any cases where piston damage from heat will result. The worst that will happen is the works (piston rings piston crown) might become gummed up, the exhaust port will become carboned up and exhaust gass passage restricted and exhaust port opening retarded because the piston will have to travel down several millimeters more before it reaches the exhaust port opening. I have seen exhaust ports so carboned shut that one could barely poke a finger through it. The engine would not rev up and it performed like the choke was on all the time. Too much oil is, indeed, a bad idea but not for the reasons you listed. Wilbur Hubbard (worked as a two-stroke mechanic for seven years and as a technical advisor for a Japanese motorcycle company for seven years) |
mixing gas and oil questions
On Oct 25, 12:02*pm, ted@theted. wrote:
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 I only have smaller 2 strokes and one jetski. The jetski mixes it's self with a oil pump to the carbs. But I mix the same ratio for all my small engines without any problems. |
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. |
mixing gas and oil questions
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 I follow the manual recommendations. i also dropped into the Vespa scooter store and bought the little plastic measuring device. It's great for a 50:1 mix. Saves guess work when out on the high seas. |
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