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| Repower Articles |
| Tunanator - A beautiful 60' Elliott that
just needed to go a little faster |
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| Besides mounting of the engines comes all
of the sub-systems. Port and Starboard exhausts were a challenge as not
only did we want to keep access very good around the engines, we had to
design a quality system that was very quiet, fit the boat, and met all of
the restriction and safety requirements from Cummins. We knew from the beginning
that we wanted underwater outlets, but with the final outlets being very
close to the stern, we opted for custom low restriction lift mufflers between
the risers and the underwater outlets. As long as we did the right calculations
and incorporated much from our past experience, I felt comfortable that
we could accomplish our goals. |
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| SUPER QUIET, LOW RESTRICTION,
GOOD ACCESS AND SERVICEABILITY, SAFE w/ LONG TERM RELIABILITY.... |
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These pics show what we came up with and
as far as meeting our goals???...Sounds like water rushing over a waterfall,
and above 12K's or so, the exhaust pressure goes from a maximum of 20"
Hg (about 11-12K's) to a vacuum at 16+ k's....
Better than we hoped for.... |
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Fuel management
is always a component of a well thought out boat.. I can't tell you how
many smaller boats I've seen where "fuel management" seemed like
a after thought.. I still see new boats that the builder is planning(?)
to use fuel to "trim" the boat???? Talk about stupid. Concrete
is much cheaper and takes up much less space should the builder "blow
it" on weight distribution. Back about 30 years ago when this boat
was built, Elliott had a vision and in the case of his design for fuel tanks,
he was cleaver. Mounted the tanks so ALL of the fuel can be used, had great
access to ALL of the fittings and he installed first class sight gages so
even a dummy can figure out what's going on. I was able to make both P &
S tanks act as one and built a custom manifold at the back on the engine
room that had (1) 1 /1/4" AQIP type fuel line feeding it via gravity..
From there it was easy to feed both engines and both generators..Even put
in a 5th output for pumping fuel to a friend in need or ????
I use a special epoxy on ALL of the threaded fittings when I assemble a
complex fuel manifold....ZERO chances of even a slight "sweat"
of diesel. Don't want to spoil a clean engine room with any #2 stuff where
it's not wanted....Although I didn't think it was necessary, the owner wanted
"doubles" on the main engines so he could switch while running. |
This is a typical Multi-Stage
system that uses a 30 mic "bulk separator" for the first stage,
and then a 10 mic fuel water separator/fuel polisher with proprietary filter
media made for Cummins most the demanding applications. I have been using
this same system for about 10 years in commercial applications with annual
fuel consumption well above 10,000 gallons per yr/per engine. Very reliable,
predictable, and easy to maintain.........
As with any repower, other systems have
to be installed con-currently along with the big-ticket items. The picture
here shows one of the custom lift mufflers for the generators, the 8"
"thru the bottom" outlet in the lazarette for the main engine,
and a very nice, but simple dash that one of the owners friends put together. |
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