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由于市场上已有较高辛烷值的汽油(66号改为70号马达法),CA-10B侧置气门发动机有必要提高压缩比。为了对原有发动机进行改造,第一汽车厂作了大量的试验工作。方法是将气缸盖表面减薄1～1.5毫米,使压缩比从6.0提高到6.4,功率提高5％,最大扭矩提高1.35％。外特性最低耗油率降低2.86％。为进一步降低油耗节省能源,采用了新研制的较小喉管的化油器,保持了原有的功率和扭矩,外特性最低油耗降低9.21％。 道路试验证明装用新型化油器和提高压缩比发动机的货车与原型车比较动力性能没有可以分辨的差别,燃油经济性无论等速试验与使用试验都可降低10％以上。 为了进一步提最压缩比和功率或再降低油耗,现正在试验铝合金气缸盖。
Due to the higher octane gasoline (No. 66 to No. 70) on the market, it is necessary to increase the compression ratio for the CA-10B side-valve engine. In order to transform the original engine, the first automobile factory made a lot of test work. The method is to thin the cylinder head surface 1 ~ 1.5 mm, the compression ratio increased from 6.0 to 6.4, the power increased by 5%, the maximum torque increased by 1.35%. External characteristics of the lowest fuel consumption decreased 2.86%. In order to further reduce fuel consumption and save energy, the newly developed carburetor with smaller throat is adopted to maintain the original power and torque, and the minimum fuel consumption of the external characteristic is reduced by 9.21%. Road tests show that there is no distinguishable difference between the power performance of a truck equipped with a new carburetor and a compression ratio engine compared with a prototype car. Fuel economy can be reduced by more than 10% no matter whether the isokinetic test or the use test is conducted. In order to further mention the most compression ratio and power or reduce fuel consumption, is testing aluminum alloy cylinder head.