ALFA 15 HP
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The A.L.F.A 15 HP is a medium size car produced by A.L.F.A., a company that later became Alfa Romeo, from 1911 to 1913.
Straight-four engine
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A straight-four engine is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft.
Diagram of a DOHC straight-four engine
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