Yamaha Motor Co. will begin marketing next spring the first-ever 4-stroke V-6 (3.1L) outboard motor that discharges exhaust into the vee between the cylinder banks. Intake, meanwhile, is on the outside of the cylinders, where exhaust is traditionally located. Almost immediately out of the exhaust ports, water is added to the exhaust gases — as in virtually all marine engines — for cooling of all parts exposed to hot exhaust. This design, in turn, also permits long intake tubes that ...

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