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Notable Cyclone features include a capacity for displacements ranging up to 4. 0 L, DOHC 4-valve per cylinder heads, direct acting mechanical bucket (DAMB) camshaft tappets, variable cam timing (iVCT) on the intake camshafts, and twin-independent variable cam timing (Ti-VCT) on some later versions. Features such as Gasoline direct injection and turbocharging were considerations in the design phase and have been added to the engine as part of EcoBoost.
A mechanical direct-acting bucket-type tappet which includes a sheet metal body, a plastic block within the body and having a cam-contacting roller received therein, a metal disc received within a seat formed in the block and operable to contact an engine valve, and opposed fins formed on the body in straddling relation to the roller and extending above the cam contacting surface of the roller such that they are in straddling relation to the engine cam.
Smart Define 2015, direct-acting mechanical-bucket, Smart Define, viewed 8 November, 2015, <http://smartdefine. org/direct-acting_mechanical-bucket/abbreviations/a>.