A low-cost spark ignition engine has been designed and constructed using modular aluminum extrusions for the engine block, crankcase, head, and sump. The use of aluminum extrusions instead of conventional sastings substantially reduces the set-up and production costs associated withthe manufactur of internal combustion engines. The improved tolerances associated with extrusions reduces machining operations and allows for faster assembly of the engine. The use of innovative technology associated with the extrusionprofiles eliminate the use of load-bearing threads in the engine block. Internal combustion engines manufactured from extrusions have applications ranging from high-performance automotive motors to small lightweight utility engines.
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