Outboard Engines Weight Reduction
A linerless cylinder solution aimed at weight reduction in high-horsepower outboard engines
Aiming to reduce engine weight, this solution successfully eliminated the need for cast iron sleeves lining the cylinder walls. A plasma spray gun is used to line the inner walls of the cylinders with an extremely high temperature alloy that forms an extremely thin but strong cylinder lining—a thermal-sprayed coating. This process was made possible through the combined use of advanced technologies and techniques, including improving the quality of the cast aluminum piece itself and surface pretreatment for the spraying. Eliminating the need for cylinder sleeves enabled a higher displacement without changing bore pitch and this also contributed to higher engine output.