[ENG] NEW SUZUKI DF350A – World Premiere 4k Review – The Boat Show

(upbeat music) (speaking in foreign language) – [Narrator] Every time a
builder presents a new engine they declare it the best,
the most innovative, revolutionary, this one really is. It’s the new 350 horsepower Suzuki. It’s a 4,390 cc 55 degree v6 engine. It has four valves per cylinder, double overhead cam shaft and
variable valve timing system. But these are not the only features that distinguish it from the competition. How did they get 80 horsepower
per liter from this engine? The pistons are special,
because they have to withstand a twelve-to-one compression ratio. What are the challenges to overcome for such a compact engine? Having a lot of cool
dry air in the chamber, and also the perfect fuel mist. A small drop in the combustion chamber could cause immense damage. So they invented a system with pallets that remove moisture from the air. To atomize the gas, that is to
reduce it to small particles and distribute it better
in the combustion chamber, for maximum efficiency
there are two injectors in each cylinder. But the real novelty is this: two counter rotating propellors, very important for a big engine that wants to propel large boats. What are the advantages? Well, it’s a bit like
having a four wheel drive. There’s more traction,
there’s more thrust, so more efficiency, less regression. But we have two propellers, that power is distributed over six blades. But why hadn’t this been thought of yet? Well, it’s not that easy, because moving two propellers requires rather advanced technology
that usually increases the torpedo size and adds
resistance to the engine. Suzuki instead has
doubled reduction ratio, this allows you to have the
gears here under the water, very small, very slender,
hydro-dynamically efficient. Now, after all these words, do
we want to see it in action? (water rushing) We are in Boca Raton, Florida. When driving such a powerful engine, obviously, we expect a
very sporty performance. Here, we have two of them, but the boat is pretty big, it’s 35 feet. It’s the Scarab Offshore 35. Just think, this hull is 10.8 meters long, three meters wide, and
weighs nearly 4,000 kilos. Then you have to consider also the people, the equipment, and the fuel. The capacity of the fuel tank is, in fact, more than 1,400 liters. (dramatic music) The purpose of this mission is to discover the
behavior of these engines. Now that we know their characteristics, we want to know what
their performances are. Let’s leave the calm
waters of this lagoon, and head towards the ocean. I’ll try out the joystick. I have to say, it gives
a very pleasant feeling, even for someone who may not be used to maneuvering with one. It immediately makes you comforted. It can be used for maneuvering, and also for sailing at slow speeds. If you want more power,
there is the boost command, which naturally pushes the
engines at a higher speed, and makes you maneuver more quickly. Having two counter rotating
propellers on the same axis also favors the precision of
maneuvering and reversing, because the rotation of
one in one direction, is canceled from the other
in the opposite direction. It’s very simple. Oh, we’re going out to
sea, it’s rather choppy. Well, given the conditions I lowered trim. They have raised these
engines on the transom, but given that the water
intake is below the torpedo, it doesn’t cause too many limitations. Raise them as you want them,
it will make you go faster. The reduction ratio of
these engines is 2.29. This means that they are
always ready to push, even very heavy, very large boats. It’s a bit like having a
low gear engaged on the car. And the other big advantage is that, after just a bit of gas, it will immediately take off planing. So far, I have not even heard them, now they start to sing. (boat engines hum) Let’s take some data for reference. We’re at 3000 RPM now, and we’re consuming a total
of 50 liters per hour. The speed is 20 knots. The Scarab is a boat with
a very deep dead rise, 23 degrees, this means it
will absorb a bit of energy, but also that it navigates
very well over rough waters. 3,500 RPM, we’ve passed 25 knots, and consumption of 70
liters per hour total. (boat engine revs) (bouncy guitar music) Now the boat has a better trim. It has extended a bit on the water, it has lowered it’s nose, and I feel that even the
engines are working better. Just tap the lever to
feel them surge forward. We’re at 4,000 RPM, speed
is 30 knots, magnificent, and the consumption, 100 liters per hour. There is the variable valve
timing system I told you about. Hear that, huh. (boat engine revs) – Eah? – [Narrator] Change the phase, change the noise, change the speed. Mamma Mia! That force! Well, for sure we have six blades. (speaking in foreign language) – [Narrator] Two counter
rotating propellers, it is crazy to feel how this propulsion system holds the route. The boat doesn’t drift sideways, even though there is a lot of wind. The four propellers that push
in all the same direction, compensating for effective rotation, well, they make you stay on track. (dramatic music) In the meantime we have reached 5,000 RPM. We are at 39 knots and the consumption is
165 liters per hour. If at 5,000 RPM I give some
more gas, what happens? They scream! (boat engine roars) We are bringing them to the max! We are 6,200 revolutions
per minute, 47 knots, 48! 222 liters an hour! But what a show! Now however, how can I make
you feel the difference that four propellers
make, compared to the two that usually equip a double
installation like this? Well, I would say that,
maybe, the acceleration, the departure is the
most interesting moment. Are you ready? One, two, three. (boat engine revs) Wow, 20, 25, 30, 35, 40 knots. What have I put on? Nothing, fantastic! When you have four propellers pushing you, the regression, or the
sliding of the propeller in the water, is less, and that’s why it accelerates so readily. It’s fantastic. It’s a very pleasant feeling to have, when the sea is choppy, because you can accelerate, if you want, to avoid falling into trough of a wave. You can slow down, and the
boat even slows down faster, precisely because there are
four propellers breaking. In short, all of the
reactions are a bit sporty, but they allow you to ride better, to be a bit more of a pilot. And as a former pilot, I have to say that
these Suzuki 350 Oubards are really different from the others. They’re really revolutionary. I think this is the engine of the present, and perhaps the engine of the future, because we know that today, the trend is to have even bigger boats, with more and more powerful engines. (dramatic music)

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