(2) Annual results of manufacture
* Total horsepower： 792,000 BHP
* Total engines：56 sets
2.4.10 Makita Corporation
(1) Development of New Model
The first model of the low-speed 4-cycle L30M engine which was developed by Makita, and adopted the hydraulic drive of the air intake/ exhaust valve and the chain drive of the cam shaft, was mounted on the 2-engine 2-shaft car ferry, and the continuous operation for 24 hours a day has been implemented with satisfactory results. (Refer to Photo 2.4.10-1.)
In the L31M test engine, the increase in the fuel consumption was suppressed to 0%, and the concentration of NOx generation was reduced by 25% in the NOx reduction test (by combination of the fuel injection timing delay with the increase in the compression ratio) which was carried out in 1996. Aiming at the further NOx reduction with the same engine, the fuel injection system provided with the pre-injection was researched and developed in the joint research with the Japanese Marine Equipment Association as the subsidy business of The Nippon Foundation in 1997 fiscal year, and reduction of the NOx generation concentration by 48% was successful.
(2) Annual results of manufacture
*Main engines for marine use
4-cycle engine 2 sets 2,600 PS
2-cycle engine 38 sets 187,665 PS
Total 40 sets 190,265 PS
(3) Production Facility
The horizontal machining center was introduced to improve the productivity in machining medium-sized works of the diesel engine. (Specifications of the horizontal machining center)
* Type： HS6A
* Capacity： Stroke
X-axis 1.3 m
Y-axis 1.0 m
Z-axis 1.0 m
ATC： 360 pieces (tool ID)
APC： 6 surfaces
*Objective works： cylinder liner, guide shoe, crosshead pin, etc.
2.4.11 Matsui Iron Works Co., Ltd.
(1) Development of New Model： nil.
(2) Annual results of manufacture
* Total number of engines： 20 sets
* Total output： 26,700 PS
2.4.12 Mitsui Engineering & Shipbuilding
(1) Engines developed in 1997 (January to December)
The needs of the customers were met by increasing the rating by the step-by-step increase in the maximum engine speed and the brake mean effective pressure while 14 years have passed since the MITSUI-MAN B&W long-stroke 6L60MC engine was developed in 1983.
Reviews including the basic structure were performed taking advantage of the technical potential and experiences obtained in the rating increase, and a novel S-MC-C engines have been developed in which novel ideas to break through the conventional common knowledge were employed everywhere. The S-MC-C engine was developed as the compact engine of the next generation where the weight is reduced by 10%, the length is reduced by 10%, and the output is increased by 10% irrespective of longer stroke. The principal particulars are indicated in Table 2.4.12-1. The first S-MC-C model of the 6S50MC-C engine (cylinder bore： 500 mm, piston stroke： 2,000 mm, mean effective pressure： 19 bar, number of cylinders： 6, and output： 12,670 PS) was completed at Tamano Works of MES in April, 1997.
