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jamiec, what´s the name of your Suzuki models? It looks like a quite modern engine on your photo. How much power can it deliver? The old Saab 3-cyl TT is 750 or 850cc and gives out about 35-50hp depending on version.
Two-strokers have survived long in small two-wheelers and in boats. I talked to a friend who´s an offshore racing boat driver just a few days ago. His V6 engine is definitely modern with air-assisted fuel injection and separate oil injection. Such an engine is said to consume 20-30% less fuel than a traditional carburetted two-stroker. I guess this is not very far from a four-stroke. When it comes to care about the enviroment such an engine still consumes 2-4% oil so it´s still beaten by four-strokers on that point.
The fuel is injected at high pressure with addition of compressed air AFTER both the transfers and the exhaust ports are closed by the piston. This makes sure not a single drop of fuel is lost during the cylinder scavenge. Without the separate injection of oil this method of injecting fuel would be impossible.
Since it´s a marine engine the exhaust is arranged the usual way through the propeller hub but since it´s a fast-going boat the propeller hub is above the water surface at high speed to reduce drag. I don´t know how a V6 handles the exhaust pulses but I have read somewhere that a 3-cyl with a short exhaust manifold will do well without expansion chambers at low and medium speed, perhaps even more efficient since it "follows" the engine speed better than a tuned resonator. At least I think so...
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