| 55-Degree Bank Angle Creates a Compact
V6
With the DF250, one major design objective Suzuki
engineers set out to realize was to design and produce a compact,
narrow profile motor. This was met by abandoning the 60 degree bank
angle normally utilized in V-type blocks and designing an all new
V-design block using a 55 degree bank angle -- an industry first.
When compared to industry norm of 60 degrees, as shown in the engine
cover comparison, the difference in size is quite clear.
Offset Driveshaft
Suzuki's utilization of an offset drive shaft in the DF90, 115
and 140 has proven successful in reducing the size of the outboard.
The DF250 benefits from this same design which positions the crankshaft
in front of the drive shaft, simultaneously moving the outboard's
center of gravity forward. This system adds to the compactness of
the outboard and provides an improvement in power performance. It
also places the engine's axis of inertia, the point where vibrations
produced by the engine are at a minimum, up over the upper engine
mount thus greatly reducing vibration.
Two-Stage Cam Drive System
The two stage cam drive system utilized in the DF250 incorporates
both gears and chain. The system's first stage gears transfer power
between the crankshaft and the drive shaft (32:40) while the second
stage utilizes a chain to deliver power from the drive shaft to
the camshaft (20:32). This allows for the use of smaller diameter
cam sprockets, which in turn allows for a reduction in valve angles
also reducing the size of the cylinder head. The timing chain is
equipped with an automatic hydraulic tensioner to keep the chain
properly tensioned. This system provides years of maintenance free
operation.
Direct Ignition
The DF250's V6 engine utilizes an advanced direct ignition system,
which uses integral type spark plug caps with ignition coils. While
reducing the number of parts and simplifying the wiring system,
this arrangement also greatly reduces electronic engine "noise"
that can interfere with VHF radios, fish finders and other marine
electronics. Controlled by the outboards's powerful 32-bit computer
this system provides each cylinder with optimum spark strength and
timing.
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Durability and Reliability
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