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#1
posted to rec.boats.building
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outboard oil mix
OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've
misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. |
#2
posted to rec.boats.building
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outboard oil mix
"rckchp" wrote: Is it 50 to 1, or 100 to 1? Thanks. Anything from 25:1 to 50:1 does the job. 25:1 will be a little smokey. Lew |
#3
posted to rec.boats.building
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outboard oil mix
50 to 1 Remember, too much oil will reduce the flash point of the fuel and
create detonation, which will melt piston and head. Steve "rckchp" wrote in message ... OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. |
#4
posted to rec.boats.building
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outboard oil mix
On Jun 13, 6:06*pm, "Steve Lusardi" wrote:
50 to 1 Remember, too much oil will reduce the flash point of the fuel and create detonation, which will melt piston and head. Steve "rckchp" wrote in message ... OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. Thanks for the correct info....I found the owner manual and you guys are right....50 to 1 it is. Thanks again. |
#5
posted to rec.boats.building
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outboard oil mix
Not so sure. Gasoline flashes fairly low. But oil has lower octane than
any gas. So pinking or detonation could still be an issue, no doubt. That's if the compression still makes it up there..... Brian W Steve Lusardi wrote: 50 to 1 Remember, too much oil will reduce the flash point of the fuel and create detonation, which will melt piston and head. Steve "rckchp" wrote in message ... OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. |
#6
posted to rec.boats.building
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outboard oil mix
On Sun, 14 Jun 2009 13:03:58 -0500, Brian Whatcott
wrote: Not so sure. Gasoline flashes fairly low. But oil has lower octane than any gas. So pinking or detonation could still be an issue, no doubt. That's if the compression still makes it up there..... Brian W It will certainly cause excessive carbon buildup, which will eventually seize or break the rings, and cause other damage and runnability issues. Steve Lusardi wrote: 50 to 1 Remember, too much oil will reduce the flash point of the fuel and create detonation, which will melt piston and head. Steve "rckchp" wrote in message ... OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. |
#7
posted to rec.boats.building
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outboard oil mix
On Sun, 14 Jun 2009 13:03:58 -0500, Brian Whatcott
wrote: Not so sure. Gasoline flashes fairly low. But oil has lower octane than any gas. So pinking or detonation could still be an issue, no doubt. That's if the compression still makes it up there..... Brian W Steve Lusardi wrote: 50 to 1 Remember, too much oil will reduce the flash point of the fuel and create detonation, which will melt piston and head. Steve "rckchp" wrote in message ... OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. Flash point has nothing to do with detonation which is controlled by octane rating and compression. Flash point is the temperature at which vapors ignite and since kerosene (with its higher flash point) will burn in most internal combustion engines it seems that flash point is of only minor interest. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
#8
posted to rec.boats.building
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outboard oil mix
On Sat, 13 Jun 2009 20:43:08 GMT, "Lew Hodgett"
wrote: "rckchp" wrote: Is it 50 to 1, or 100 to 1? Thanks. Anything from 25:1 to 50:1 does the job. 25:1 will be a little smokey. Lew |
#9
posted to rec.boats.building
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outboard oil mix
On Sat, 13 Jun 2009 20:43:08 GMT, "Lew Hodgett"
wrote: "rckchp" wrote: Is it 50 to 1, or 100 to 1? Thanks. Anything from 25:1 to 50:1 does the job. 25:1 will be a little smokey. Lew People used to dump a quart of ordinary 30 weight auto oil into a six gallon tank and fill it up. That works out to 23 to 1. |
#10
posted to rec.boats.building
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outboard oil mix
Bruce,
You are a nice guy, but you are not correct here. Please pay close attention, heavy lube oil contamination will create detonation in spark ignition engines. It will melt pistons, spark plugs and heads, especially in outboard motors. The percentage of oil in the fuel that creates this damage is a matter of heat.The higher the heat of the combustion chamber, the lower the oil percentage threshold that diesels the fuel mix . The reason this is more dangerous in outboards is because the noise of detonation is muffled by the water jacket and masked by excess ambient noise in the boat. Additionally the severity of this condition is greatly amplified by throttle position and the general mode of operation is WOT. If you think for one second that flash point of fuel is not significant, place a drop of gasoline down the barrel of a daisy BB gun and fire it. No change. Place of drop of oil in the barrel and repeat the test. It easily detonates when the spring is released. I used to this all the time as a kid. Steve "Bruce In Bangkok" wrote in message ... On Sun, 14 Jun 2009 13:03:58 -0500, Brian Whatcott wrote: Not so sure. Gasoline flashes fairly low. But oil has lower octane than any gas. So pinking or detonation could still be an issue, no doubt. That's if the compression still makes it up there..... Brian W Steve Lusardi wrote: 50 to 1 Remember, too much oil will reduce the flash point of the fuel and create detonation, which will melt piston and head. Steve "rckchp" wrote in message ... OT. I'm reactivating a 1997 Evinrude 9.9 hp outboard and I've misplaced the owner manual, and I don't remember the proper oil mix ratio. Is it 50 to 1, or 100 to 1? Thanks. Flash point has nothing to do with detonation which is controlled by octane rating and compression. Flash point is the temperature at which vapors ignite and since kerosene (with its higher flash point) will burn in most internal combustion engines it seems that flash point is of only minor interest. Cheers, Bruce (bruceinbangkokatgmaildotcom) |
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