and the head is tightened to a specified torque, but the thickness of the gasket does not reach a certain thickness after tightening. Therefore, in gear drive, after tightening the head to the block, it is necessary to select and attach several sets of gears with different backlash prepared. If the backlash is too large, the gear train will vibrate and the gear may be damaged. With a belt-drive, such adjustments are not necessary, and it is possible to deal with it simply by applying appropriate tension to the belt with a tensioner. In a normal belt drive, the crankshaft and camshaft are directly connected and decelerated to 1/2 in the belt drive to drive, but in OX66, once decelerated to 1/2 with gear, one pair is driven by separate belts for the left and right banks at a speed ratio of 1. This is to make the cam side pulley compact. The pulley diameter is determined by the small-diameter side pulley in relation to the bending fatigue of the belt and the number of meshing ridges. In normal direct drive, the diameter of the pulley on the cam side is double the diameter of the pulley on the crankshaft side, which inevitably results in a large pulley. Therefore, he said that the OX66 decelerates in advance with gears, reduces the diameter of the cam side pulley, and narrows the overall width of the engine. The OX66 uses two idle pulleys and one tension pulley in one bank, and the water pumps in the left and right banks and the oil pumps in the left bank are also driven by belts. Using an idle pulley (idler) is a method of increasing the number of meshing ridges of the pulley to reduce the shear stress of the ridges, but on the other hand, it also has the disadvantage of promoting bending fatigue of the core body. All the main auxiliary equipment is simply put together at the front end of the engine with a drive system by belt drive, which contributes to shortening the overall length of the engine. Engine control At the time of the announcement of the OX66 and in the 1985 season, the fuel supply system and ignition also adopted electronic control. The fuel supply system uses electronically controlled fuel injection (EFI) manufactured by Nihon Denso. The basic format is the speed density method, which is a correction