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“PAHP-Treatment” is a new surface treatment technology that improves the corrosion resistance of a painted aluminum-alloy part and has only a low impact on our environment. Moreover thanks to this technology, we can significantly save our cost. PAHP-Treatment is an abbreviation for “Phosphoric Acid and Hydrogen Peroxide” and one of the surface preparations that above both are applied. As aluminum element of the surface of a part rusts when being soaked in a corrosion environment, the adhesion of a material and its painting decreases. But such aluminum oxide is almost removed from there by this PAHP treatment, and then, the surface becomes rough. As a result of it, the adhesion between the surface and its painting is improved. Therefore this treatment was applied to the painted parts of our outboards (Photo. 1) that require the higher corrosion resistance because they are used under a lot of severe conditions and has been adopted in aluminum-alloy pretreatment process.

The Emission Regulations for Motorcycles in Japan was put into effect in October 1998 with the goal of reducing the total hydrocarbon emissions from motorcycles in the country to around 50% of the present amount. These regulations initiated a need to develop emission-converting catalysts, having the three characteristics written below, for two-stroke engines that historically have produced more hydrocarbons than four-stroke engines: 1 High performance of hydrocarbon conversion 2 High light-off performance 3 High thermal stability under high temperature Among a number of catalytic adjustment methods, the loading method of precious metals and the washcoat preparing method were modified to realize mass production of high-performance, low-cost catalysts.

For better power output and fuel economy of a four stroke cycle ignition engine, the ignition timing should preferably be set to the minimum spark advance for best torque (MBT). It is found that when the ignition timing is set MBT, the crank angle of the maximum combustion pressure (θpmax) usually lies between 12 and 14 deg after top dead center (ATDC) regardless of any engine specifications or operating factors. Therefore, the ignition timing can be controlled to be MBT by using the θpmax. This paper describes the relationship between the θpmax and MBT by both experimental results and numerical calculations, and MBT control system utilizing θpmax. And the test results by using this system are also described.

A new method was developed to help determine the conditions that would create adhesion strength of heat-resisting coatings formed in plasma spraying. This method is a combination of an experiment design that uses a Latin square and multiple regression analysis. Since it allows the direct analysis of experimental data, conditions can be determined in one third of the number of tests required by conventional experimental methods. The multiple regression equation gained through this study is also effective in comparing the heat resistance of the heat-resisting coating.