![]() The naturally aspirated E204 engine was initially introduced in the 2005 Subaru GD/GG Impreza and 2006 Subaru BL/BP Liberty as a more powerful alternative to the single overhead cam EJ202 engine, but effectively replaced the EJ202 when the GE/GH Impreza was released in. Finally, an attempt has been made to simplify and standardise cleanliness levels, incorporating current standards. The Subaru EJ204 was a 2.0-litre horizontally-opposed (or 'boxer') four-cylinder petrol engine with double overhead camshafts. Computer image analysis is used to assess cleanliness levels of the near white (very thorough) level and finds that the ISO and Joint standard levels overlap. This paper looks at the various standards and levels of blast cleaning, what they really describe and how they differ from one another. Moreover, with the arrival of power tools that can produce a level of surface cleanliness similar if not equal to levels achievable by abrasive blasting, it is worth reviewing these standards. Standards for surface cleanliness have been available for over fifty years, but there is still confusion regarding definitions, relation between pictorial and written standards and how the standards developed in North America (Joint SSPC/NACE standards) relate to the ISO standards used in the rest of the world. The cleanliness of a prepared surface is perhaps the most important factor determining a the durability of a subsequent protective coating system.
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