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Old October 27th 10, 08:08 PM posted to rec.boats,rec.boats.building,rec.boats.cruising
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Default 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!
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"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   Report Post  
Old October 28th 10, 12:34 AM posted to rec.boats,rec.boats.building,rec.boats.cruising
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First recorded activity by BoatBanter: Mar 2009
Posts: 782
Default 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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