Anodized Blue Aluminum
The anodized blue plates make a nice contrast to the stainless steel screws, which creates a nice technical accent to the engine's appearance.
The blue color absorbs radiated heat (i.e. from a lamp), which helps the engine to run at low temperatures.
The temperature differential for the engine to run is approximately 15 degC or even less.
Also, the anodizes surface is less subject to possible scratches, because it is harder than unprotected aluminum.
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