jeffies, jeffies, jeffies why is it
sooooooooooooooooooooooooooooooooooooooooooooooooo ooooo difficult for you to
understand English, as the language is used. let's take a look at the term you
can't seem to understand, to wit:

a siphon break is
"recommended in applications where the exhaust manifold may be below the
waterline at any angle of heel."

take a look at that, jeffies. read it again. and again. and again, until you
understand that "exhaust manifold" in this case means **the point of the
exhaust manifold open to ambient air pressure**.
In other words, the water injection point.

jeffies, the exhaust manifold has just two openings in it. the opening to the
engine valves and the opening to pipe leading to the water lift muffler. I
know this may be difficult for you to understand, jeffies, but every last piece
of the exhaust manifold is metal, the pieces bolted together not only water
tight but **air** tight. jeffies, water can not go through the metal walls of
the exhaust manifold. It can't. water can only get into the exhaust system
through the water injection point. That's only. Only place.

Therefore, **the part of the exhaust manifold allows water into the system MUST
be above the water line** (ignore special cases requiring special care that
might be used in racing boats and/or military applications).

jeffies, you are arguing something you don't understand. It is the water
induction part of the manifold that has to be above the water line, not the
engine valve part.

If the engine is below the waterline, its impossible to have the exhaust
manifold above the waterline.

really? see below

Yes really, its the standard, and its the law. The ABYC says a siphon break
is
"recommended in applications where the exhaust manifold may be below the
waterline at any angle of heel." And the Code of Federal Regulations,
46CFR182
says that the ABYC standard is the law in this area. The CFR also says the
injection must be as close as possible to the manifold.

So while you can claim that the injection point is the important point to
measure, the law says otherwise. Failure to abide by this would certainly
mean
failing a survey, and making it impossible to insure the boat.




Unless, of course, you have a "magic manifold"
that can be mounted several feet away from the engine.

You can use a special elbow to raise the injection point a few inches

"a few inches"?? at least six inches above the water line.

Actually its just 5 inches higher. When the boat is "at repose." Let it
heel
45 degrees, and its only 3.5 inches higher.

and there is not a
think "special" about it. the pipe is solid bolted to the manifold, an
elbow
turns the pipe **UP**, jeffies, until high enough, then the water injection
elbow is mounted, etc.

It's special in the sense that in the Yanmar parts catalog the "straight
pipe"
is the standard one, while the raised elbow is listed as "optional
equipment."
Admittedly, almost all sailboats would use the raised elbow. (A friend has
a
new YM engine with the straight pipe, but its a catamaran with a single
engine
perched a foot above the water driving a Sonic Leg.)



what word don't you understand?

I understand perfectly. Why is it that you continually claim the standard
and
the law should be ignored? Its very simple: if the manifold is below the
waterline, a siphon break should be installed. Failure to do so means
failing
the survey, no insurance, no marina, no sale.


but that
does not satisfy the requirement that a siphon break is required if the
manifold
is below the waterline.

jeffies, it is NOT the manifold you need to worry about (anymore than you
need
to worry about where the oil pump is) BUT where the water (from outside the
hull) empties into the system, THEREFORE if the water injection point is
above
the water line **there is no siphon potential**. None.

That's not what the standard says. That's not what the law says. Why are
you
claiming the law should be ignored?


jeffies, this is easy stuff. as in E Z.

It sure is, jaxie, and you still don't get it.

You still haven't explained how the engine can be mounted so that the
manifold
(or even the injection point) can stay above the waterline. In any center
cockpit boat, for example. the entire engine will be well below the
waterline,
even before heeling is considered. Raising the injection point 5 inches
still
won't help.