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FORD FOCUS MIDGET ENGINE OWNERS MANUAL CONTENTS: INTRODUCTION 1. COOLING SYSTEM 2. LUBRICATION 3. ENGINE 4. FUEL SYSTEM 5. IGNITION 6. EXHAUST 7. DRIVELINE 8. PLUMBING 9. GENERAL PROCEDURES P O Box 895 - San Miguel, CA - 93451 805-467-9351 www.focusmidgets.com . 1.  COOLING SYSTEM 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. Coolant exits the head at the cast elbow located at the rear of the engine, and enters the engine at the pump.  Since the engine runs on methanol, and the compression ratio has not been raised, excessive heat is generally not a problem.  Therefore, a standard Midget-type radiator has proven more than adequate. High pressure, racing radiator caps have not been needed to maintain acceptable temperatures, 16 lb. caps have been adequate.  All main coolant lines should be at least -10, or 5/8" inside diameter. IMPORTANT:  An overflow, or "burp" tank, MUST be used to insure proper cooling.  This tank must be mounted at the highest point in the system (i.e. on the dash board), and must have an inlet and an outlet coolant line, -4 or larger.  Typically, these lines run to either side of the radiator (best on a "two pass" radiator), or you can run one line from the radiator and one from the water elbow at the back of the cylinder head.  NOTE:  No modifications to the cylinder head itself are allowed. This photo shows a typical "burp tank" installation.  The tank is mounted as high on the dash as possible.  One line runs fro ...
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