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Old 22 September 2008, 14:26   #1
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Why is my Engine a Heavily Smoker ?

Just a comment of what cracy people using outboards can do to them. One day my gardener who often sees me water my boats/engines on the parking lot after use, made me this comment, he used in the jungle area where he worked on a river, a Evinrude 55 HP, 2 strokes engine that smoked heavily, worst than a Oriental. Asked him what was his gas/oil ratio. Don't know was his answer, we use a complete filled tuna round can for every gallon of gasoline we put into the tank.

Was puzzeled by his tech answer, happens to have at hand a well made round container made by Sea Choice Marine Products that has different gas/oil ratios, so filled a complete tuna can and poured it into the container. Guess what, the guy had been running for years on 50:1 ratio instead of 25:1. Plugs didin't last long and the boat looked like an old carbon train smoking up river.

Now he knows for sure the exact gas/oil ratio. Wanted to comment that a complete filled standard tuna can, can mix perfect ratio 2 gallons(3.78/gallon each) of gasoline.

Happy Boating
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Old 22 September 2008, 15:00   #2
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You must have very small cans of tuna.

Around here, tuna comes in 6 ounce cans. 1 gallon = 128 ounces. 128/6 = 21.3:1

Darker smoke (not steam) usually = excess oil, so this makes sense.
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Old 22 September 2008, 15:06   #3
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Originally Posted by Locozodiac View Post
Just a comment of what cracy people using outboards can do to them. One day my gardener who often sees me water my boats/engines on the parking lot after use, made me this comment, he used in the jungle area where he worked on a river, a Evinrude 55 HP, 2 strokes engine that smoked heavily, worst than a Oriental. Asked him what was his gas/oil ratio. Don't know was his answer, we use a complete filled tuna round can for every gallon of gasoline we put into the tank.

Was puzzeled by his tech answer, happens to have at hand a well made round container made by Sea Choice Marine Products that has different gas/oil ratios, so filled a complete tuna can and poured it into the container. Guess what, the guy had been running for years on 50:1 ratio instead of 25:1. Plugs didin't last long and the boat looked like an old carbon train smoking up river.

Now he knows for sure the exact gas/oil ratio. Wanted to comment that a complete filled standard tuna can, can mix perfect ratio 2 gallons(3.78/gallon each) of gasoline.

Happy Boating

Don't you mean the other way around???
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Old 22 September 2008, 15:46   #4
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Don't you mean the other way around???
You beat me to it
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Old 23 September 2008, 11:51   #5
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You must have very small cans of tuna.

Around here, tuna comes in 6 ounce cans.

Yeah, but that's 6 oz by weight, not volume.


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Old 23 September 2008, 13:12   #6
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Yeah, but that's 6 oz by weight, not volume.


jky
True but I don't have an actual can handy. 6oz volume of water = roughly 6.1oz weight. Assuming tuna is little denser than water the mix gets closer to 25:1. It can't get anywhere near 50:1
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Old 23 September 2008, 16:15   #7
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True but I don't have an actual can handy. 6oz volume of water = roughly 6.1oz weight. Assuming tuna is little denser than water the mix gets closer to 25:1. It can't get anywhere near 50:1
Resuming: If you pour 1 complete tuna can of oil per gallon (3.78 lt) , will give you a 50:1 mix ; 1 can will mix adequate 2 gallons to 25:1. The can is 85 mm diameter/40 mm height/175 gram. Maybe a good mix gas/oil ratio to new boaters without experience on mixing ratios. 1 full tuna can per each 2 gallons, 3 full tuna can for a complete 6 gal gas tank. But eat firts whatever was in the can....

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Old 23 September 2008, 16:24   #8
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Resuming: If you pour 1 complete tuna can of oil per gallon (3.78 lt) , will give you a 50:1 mix ; 1 can will mix adequate 2 gallons to 25:1.
you've still got it the wrong way round
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Old 23 September 2008, 16:31   #9
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you've still got it the wrong way round
You can be flexible, the engine will work just fine. In math the order of factors doesn't alter the product, seems we have a different math point of view.
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Old 23 September 2008, 16:41   #10
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You can be flexible, the engine will work just fine. In math the order of factors doesn't alter the product, seems we have a different math point of view.
1 tuna can of oil in 1 US Gal will give approximately 25:1 fuel:oil ratio.
1 tuna can of oil in 2 US Gals gives approximately 50:1 fuel:oil ratio.

which is the opposite from what you stated twice now.
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