Suzuki DF80 - High Performance Engineering; DOHC 4-Valve Engine; Two-Stage Gear Reduction

DOHC 4-Valve Engine
The DF70/80/90 benefit from Suzuki's unrivaled experience
in the design and manufacture of motorcycle, automotive,
and marine engines. Drawing upon their past advancements
and achievements, Suzuki engineers have provided these
new outboards with advanced engineering that delivers high
power output, performance, fuel economy, and efficient
operation.
Starting with
an in-line 4-cyllnder block, Suzuki designed an
all new, more compact dual overhead cam (DOHC) pow-
erhead with four valves per cylinder. Its design has reduced
the overall size of the outboard while providing high perfor-
mance power. Power is delivered via a two-stage mixed cam
drive system consisting of gears that transfer power
between the crankshaft
and the drive shaft, and a chain that
delivers power from the
drive shaft to the camshaft.
Two-Stage Gear Reduction
To take maximum advantage of the power produced by
these high performance engines, Suzuki engineers have
utilized a two-stage gear reduction ever since the intro-
duction of the original
DF90. The second generation
DF70/80/90 follow in their predecessor's footsteps
employing the
same method to provide an efficient means
of supplying maximum propulsion.
The key to gaining maximum propulsion is through the use
of a large diameter propeller with a suitable pitch. But
spinning a larger propeller requires more torque, which
requires larger
gears or a larger gearbox adding weight and
resistance that do not always produce effective results.
Suzuki engineers have long used a two-stage gear reduction
system that provides the needed torque without adding
29:36 (1.24)
•
unwanted
bulk and weight. Through this method, the
DF70/80/90 achieve a powerful 2.59:1 final drive ratio,
producing the
needed torque for
quick acceleration
and great
top-end
speed.
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