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Honda Marine ‘Blasts’ Its Competition Out Of The Water
Honda’s revolutionary
Boosted Low Speed Torque (BLAST™) system, featured in
the new BF75 and BF90, pioneers a new age in four-stroke
outboard engines. Developed to improve acceleration at
lower speeds, BLAST™ results in powerful hole shot
performance – equivalent to that of rivalling two-stroke
outboards – to get boats on the plane quicker. Honda
Marine technical officer Darren Milgate said the
‘air/fuel ratio linked ignition timing control
technology’ bridged the acceleration gap between
two-stroke and four-stroke outboards.
“Hole shot acceleration
of Honda’s new BF75 and BF90 is improved by MBT trace
control – MBT standing for Minimum advance for Best
Torque,” Mr Milgate said. “The engine’s Electronic
Command Module (ECM) determines throttle opening during
acceleration and advances the ignition timing to develop
more horsepower at low revs. A quick movement of the
throttle control lever activates the BLAST™ system,
aggressively advancing the ignition curve.” “Upon slow
advancement of the throttle control lever, a mild
ignition spark advance curve is initiated.” During
acceleration, the air/fuel ratio goes to a richer
air/fuel ratio setting, which is more fuel than the
engine demands. At that point, the ECM – receiving
information from the throttle sensor and other engine
sensors – determines the best spark advance by tracing
the ignition timing (-1° to knock limit) for best
air/fuel ratio.
“In a nutshell, the
resultant boost in horsepower and torque at low revs
contributes to very strong acceleration from 0-50m to
get the boat on the plane quickly, something which was
traditionally considered a weak point of four-stroke
outboards,” Mr Milgate said. “Not anymore! This patented
technology will be the global benchmark for future
four-stroke outboard engine designs.” Honda’s BLAST™
system, featured in the new BF75 and BF90 four-stroke
outboards, results in powerful hole shot acceleration on
par with that of two-stroke engines. Further information
visit:
www.honda.com.au
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