Home' Ausmarine : March 2011 Contents ADVANCES IN MARINE ENGINES AND PROPULSION SYSTEMS
Honda's revolutionary Boosted Low
Speed Torque (BLAST) system is now
featured in every model from the
compact BF40 right through to the
Making its debut in the BF75/90 in
2006, BLAST was developed to improve
acceleration at lower speeds. Activated by
sharp throttle movement, the air/fuel ratio
ignition timing control technology results
in powerful hole shot performance to get
boats on the plane quicker.
Honda Australia assistant marine
service manager Stephen Harvey said the
patented BLAST technology was the global
benchmark for four-stroke outboard
"In a nutshell, BLAST makes available
the greatest amount of torque at the precise
moment it's required," Mr Harvey said.
"The engine's Electronic Command Unit
(ECU) determines throttle opening during
acceleration and advances the ignition
timing to develop more power at low revs.
"A quick movement of the throttle
control lever activates BLAST, aggressively advancing the ignition curve, while upon
slow advancement of the throttle a mild
ignition spark advance curve is initiated
and the engine operates as normal."
During acceleration, the air/fuel ratio
goes to a richer setting. At that point, the
ECU -- receiving information from the
throttle sensor and other engine sensors
-- determines the best spark advance
by tracing the ignition timing for best
"The boost in power and torque at low
revs contributes to very strong acceleration
from 0-50 metres to get boats on the plane
very quickly, something which was
traditionally considered a weak point of
four-stroke outboards," Mr Harvey said.
"Combining incredible out-of-the-hole
performance with all the benefits of
Honda's advanced four-stroke technology,
BLAST has changed attitudes towards
four-stroke outboards the world over."
BLAST is available in Honda's BF40,
BF50, BF60, BF75, BF90, BF115, BF135,
BF150, BF175, BF200 and BF225.
For further information contact:
Mark Parkes current boat, 'Mojo', is a
7.2-metre bridge deck plate hull
machine. Power comes in the form of a
Yanmar 6LPA-STZP2 (234kW) engine
matched to a Bravo 3X drive.
While the boat was launched barely two
years ago, the Yanmar is the second engine
to have graced the engine bay. The original
four-cylinder diesel engine (non-Yanmar)
was incorrectly specified for the task and
simply was too small.
"Although I took the advice of the
engine supplier involved," Mark lamented,
"it was just too small and the boat was
underpowered. It struggled to get on the
plane and then worked hard to stay there.
There simply wasn't enough torque or
power to do the job."
It was then that Mark approached Nick
Marsden (Power Equipment's North
Queensland Area Manager) who is based in
Townsville and started to get some well-
"Since I first got in touch with Nick and
the Yanmar team, I've never looked back,"
Mark Parkes said. "Not only did they fully
appreciate my predicament but they had a
solution and worked with me and on a
great deal to re-power Mojo."
The solution to the problem was a
Yanmar 6LPA-STZP2 engine which bolted
up perfectly to the existing Bravo 3
Yanmar's sophisticated 6LPA-STZP2 is
a true "go-fast", well-proven package with
a direct injected, turbocharged and
intercooled straight six cylinder engine
pumping out 234kW at 3,800rpm at the
flywheel. The four-valve per cylinder
engine boasts a big 4.2-litre displacement
for sustained torque through the mid rev
range while still offering an impressive
power to weight advantage coming in with
a dry weight of 408kgs.
With a new heart, 'Mojo' has been
transformed and Mark's enthusiasm,
obviously dented through the experience,
is sky high again. When compared to the
original engine, the Yanmar delivers an
additional 48kW but there is heaps more
torque thanks to the bigger displacement of
the Yanmar engine, more than 1.9 litres
extra in this instance.
The transformation on the water has
been dramatic. The Yanmar 6LPA-STZP2
punches the 3,500kg 'Mojo' onto the plane
easily. At wide open throttle the Yanmar
spins over at 4,000rpm for a top speed of
35 knots (64km/h). Mark reckons that the
ideal cruise speed is between 3,200 and
3,400rpm with the GPS showing a speed of
27 knots (50km/h). Fuel consumption is a
miserly 18 litres per hour.
"With the Yanmar on board now for 12
months and some 225 hours of trouble free
boating behind us, 'Mojo' is a delight. Now
we're going to sea and doing it easily,"
"But the best news of all is the low fuel
consumption. We can head out 70nm from
Townsville, troll all day long then come
home 70nm and use just 100 litres of fuel.
That's real economy for a fisherman."
For further information contact:
Power Equipment, Victoria.
Honda outboard motor range "BLASTs" off with improved acceleration
The Honda Boosted Low Speed Torque (BLAST)
system is now featured in every model
Yanmar re-power gives fisherman his 'Mojo' back
The new Yanmar engine is at the heart of a highly successful repower for 'Mojo'
March 2011 AUSMARINE
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