The fuel injectors are located in the lower intake piece. On top of the engine, there is a two-piece intake manifold. The engine uses Ford's stretchy FEAD (front-end accessory drive), which has no idlers or tensioners to rob power from the engine. The intake valve lift is 9.8 mm (0.385 inches), the exhaust valve lift is approximately 9.1 mm (0.360 inches). The valve sizes are (1.45 inches) intake and (1.22 inches) exhaust. The lobe contact surface of the bucket is highly polished. The valvetrain uses Ford's Direct Actuating Mechanical Buckets. The twin-independent variable cam timing (Ti-VCT) on both intake and exhaust was presented in 2011. Until 2011, the engine comes with variable cam timing (iVCT) on the intake camshafts. The intake camshaft for each cylinder bank provides rotation to the exhaust camshaft via a secondary small single-roller chain. A primary timing chain drives a water pump and intake camshafts only. The engine is equipped with a forged crankshaft made from 4130 alloy steel, 6-bolt billet steel main caps, and cast-in piston oil squirters.Īluminum alloy cylinder heads have four valves per cylinder and two chain-driven camshafts on top. The cylinders feature cast-in liners and are fully floating at the top of the engine block (open-deck type). The additional displacement comes from an increased bore size by 3.0 mm comparing to the 3.5-liter version. All Cyclone engines have the same 86.6 mm (3.41 in) stroke. It has a removable rear main seal cover plate and a structural rear sump cast aluminum oil pan. The 3.7L Duratec has a cast aluminum alloy cylinder block with contemporary architecture.
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