The Focus Midget engine is equipped with an opposite rotation water pump impeller, and the water pump pulley turns in the opposite direction when compared to the street version of the engine. This does not reverse the coolant flow through the engine, it simply allows the pulley to be driven with the HTD belt instead of using the back-side of a serpentine belt. No modifications to the water pump impeller or water pump pulley are allowed. This photo shows a typical “burp tank” installation.
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