Spring 1999 Issue


Motors That Make Multi's Move
by Charles K. Chiodi

In this article, we explore the Suzuki brand outboard motor as the driving force on the transoms of modern multihulls. In subsequent issues, we will do the same for other brands as well as for inboard diesels.

If you think Suzuki just makes good automobiles and motorcycles, think again. They also make excellent outboard motors based on their experience with the highly successful 1.3 liter engines used worldwide in Suzuki cars. A good example is the Suzuki 60/70 horsepower EFI (Electronic Fuel Injection) four stroke engines introduced last year. They not only outperform same-size two stroke engines, but they do it at a much better fuel economy (up to 75%) and a much lower hydrocarbon emission. This feature exceeds the EPA requirement that will be enforced by the year 2006.

What's your need?

5 Horses or A Stable of 225?

5 The smallest in Suzuki's stable is the 5 HP outboard motor introduced this year. It is an improvement over its predecessor, the 4 HP, by having a 21% larger piston displacement and a different cylinder head.

Starting case, reliable performance, and combustion efficiency is assured by the use of Suzuki's exclusive Pointless Electronic Ignition system. It also prolongs spark plug life. Loop charging provides more power per cubic inch resulting in higher performance and better fuel economy - a combination not easily found elsewhere.

The built-in fuel tank makes this 5 HP easily portable outboard motor ideal for tenders, inflatable, and as an auxiliary on small multihulls such as cruising beach cats, Tremolinos, Trikala, WindRiders, etc. A remote tank can be attached for long-range cruising.

9.9 HP is the next size in Suzuki outboards, and also a small portable for those who need just a bit more power for the above listed multihulls; especially if getting in and out of their normal mooring or launching site involves strong currents. This 4-stroke outboard has two cylinders and is available in two shaft lengths: 15" and 20". Its fuel economy is 38% better than comparable two-strokes.

15 HP 4-stroke is another "portable" outboard for just-a-bit more power, but has basically the same engineering as the 9.9 HP.

40 New for the 1999, and the proud recipient of the prestigious 1998 IMTEC Innovation Award are the 40 and 50 HP EFI four-stroke outboards, the pair on the low end of the mid-range Suzuki power plants. They both have sequential electronic fuel injection, in-line three cylinder powerheads with four valves each, dual overhead cams and direct ignition system.

Exclusive features in Suzuki's mid-range four-stroke engines are the timing chain, bathed in oil, with a hydraulic chain tensioner.

60 HP and the 70 HP EFI four-stroke engines won the IMTEC Innovation Award in 1997. These inline four-cylinder outboards are based on Suzuki's successful 1.3-liter automotive engines.

These outboards have a list of technological firsts:

a. advanced sequential multipoint EFI system;
b. solid state ignition system;
c. computer controlled fuel system which delivers the precise fuel/air mixture to each cylinder individually and in sequence;
d. a single, computerized Electronic Control Unit (ECU) which controls both the ignition system and the fuel injection system;
e. Idle Speed Control (ISC) that insures a very stable low RPM (700) idle, due to a special manifold air port and a solenoid-controlled incoming air flow;
f. Optional multi-function tiller handles with F-N-R shifting;
g. Starter key and emergency stop lanyard.

The exclusive design of the solid-state ignition system provides twice as much energy to the spark plugs and increases the spark plug duration 10 times longer, thereby assuring more complete combustion with each power stroke.

These technological advances make the Suzuki outboards exceptionally powerful and at the same time efficient - having up to 75% better fuel economy than comparable two-stroke engines.

The high gear reduction ratio of 2.42:1 allows the use of large pitch propellers that deliver strong low-speed acceleration and better top speeds.

Power for electronics, bait-well pumps, radios etc… is supplied by a powerful 21-amp alternator.

An engine monitoring system combines the tachometer and hour meter, displays engine rpm and has warning lights for abnormalics in oil temperature, oil pressure, low voltage and other rev. It also has an audable alarm.

Suzuki engines are designed so that the engine block and exhaust manifold are one piece, to cut down on weight and to eliminate potential gasket leaks. An integral fuel-pressure regulator/vapor separator reduces the number of hose connections and possible leaks.

An electronic control unit (ECU) constantly monitors the engine's vital signs: engine speed, air pressure, air and cylinder wall temperature, thereby being able to automatically adjust the ignition system timing for optimum performance and efficiency under constantly changing boating conditions.

Larger engines offered by Suzuki are:

85 HP Inline 3
100 HP V-4
115/140 HP EFI Inline 4
150 HP EFI V-6
200 HP EFI V-6
225 HP EFI V-6

The 30' Cobra Predator catamaran can top 80 mph with twin 225 HP Suzukis.

Galvanic corrosion - the greatest enemy of outboard motors - is reduced to a bare minimum by the use of stainless steel water pump housing (a Suzuki exclusive); stainless steel fasteners coated with Dichromate, multiple zinc anodes and bonding wires, as well as a liberal use of epoxy primer.


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This is how the Multi Point Sequential Electronic Fuel Injection Works





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