Download Free Ford Focus Midget Engine Owners Manual.pdf 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.
The Focus Midget engine utilizes a modified wet sump / oil accumulator system. The original equipment, cast aluminum “engine girdle” has been modified and the O.E. oil pan removed. It is replaced by the oil pan sub-plate and a wider, shorter cast aluminum oil pan. This pan is angled at the bottom to match the 30 degree lay-over of the engine when installed. The oil pick-up has been relocated to the right rear corner of the pan. No modifications of the sub-plate, oil pan, or pick up are allowed. Supplied with each engine is an “oil accumulator”. Simply put, this is a pressurized cylinder that is incorporated into the oil pressure circuit, via a “T” fitting. Under normal conditions, the oil pressure generated by the engine will force oil into the cylinder, where it is retained at 50-70 psi. If the oil pickup (in the oil pan) draws air, the subsequent drop in oil pressure in the engine will cause the fully pressurized oil in the cylinder to be forced back out into the system, maintaining adequate oil pressure until the pick-up once again sees oil. The oil accumulator MUST be installed vertically and plumbed directly to the oil inlet on the engine. Also, the accumulator must be pre-charged with 10 psi of air, with the engine off. This pressure should be re-checked before each race.
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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.
The Focus Midget engine utilizes a modified wet sump / oil accumulator system. The original equipment, cast aluminum “engine girdle” has been modified and the O.E. oil pan removed. It is replaced by the oil pan sub-plate and a wider, shorter cast aluminum oil pan. This pan is angled at the bottom to match the 30 degree lay-over of the engine when installed. The oil pick-up has been relocated to the right rear corner of the pan. No modifications of the sub-plate, oil pan, or pick up are allowed. Supplied with each engine is an “oil accumulator”. Simply put, this is a pressurized cylinder that is incorporated into the oil pressure circuit, via a “T” fitting. Under normal conditions, the oil pressure generated by the engine will force oil into the cylinder, where it is retained at 50-70 psi. If the oil pickup (in the oil pan) draws air, the subsequent drop in oil pressure in the engine will cause the fully pressurized oil in the cylinder to be forced back out into the system, maintaining adequate oil pressure until the pick-up once again sees oil. The oil accumulator MUST be installed vertically and plumbed directly to the oil inlet on the engine. Also, the accumulator must be pre-charged with 10 psi of air, with the engine off. This pressure should be re-checked before each race.
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