100 yards. According to the instruction manual of Wei Chai 160 horsepower, it can be seen that the high-speed lifting of 100 yard is the most fuel-efficient and economical. Wei Chai 160 engine model WP4. 1Q 160E50. Engine brand Wei Chai. Engine series WP4. 1 series. Engine manufacturer Weichai Power Yangzhou Diesel Engine Co., Ltd. is suitable for light/medium trucks, special vehicles and buses. The intake air is supercharged and intercooled. The number of cylinders is 4. Fuel diesel. The cylinders are arranged in a straight line.