After the motor vehicle is used for a long time, a little carbon deposit is formed in the needle valve surface of fuelinjector and the fuel injection quality will be affected.
汽车经长时间使用后，喷油器针阀表面会形成少量积碳，影响其喷油质量。
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By theoretical analysing and calculating, we find the short needle valve fuelinjector can further decrease the impact stress of the needle valve to the sealed conical surface.