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Valve timing diagram for a 4-stroke engine. With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in ...
For the first time, a diesel engine was offered in the F-150, as a 250 hp 3.0L Power Stroke V6 was introduced during the model year, dependent on trim (commercial and fleet sales only, for XL and XLT trim). For 2019, the 450 hp version of the 3.5L engine was introduced to the flagship Limited trim.
For 1991, it was exclusive to the regular-cab F-150; for 1992, it was available on all body styles of the F-150 and introduced on the Ford Bronco. The Nite edition was available with two-wheel drive or four-wheel drive with either the 5.0L or 5.8L V8; it also included a sport suspension and alloy wheels on 235/75R15 white-letter tires.
2012–present; The 3.2 is an I5 engine used in the Ford Transit, the Ford Ranger, Ford Everest, Mazda BT-50 and the Vivarail. For the North American-spec Transit, * the 3.2 L Duratorq is modified to meet American and Canadian emissions standards and is branded as a Power Stroke engine.
VCT on the intake camshaft is used primarily for increasing engine power and torque as the PCM is able to optimize the opening of the intake valves to match the engine conditions. [2] VCT is used in Ford's Triton 5.4L 3-valve V8 engine, the Australian Barra 182 and 240 Inline-6s, and Ford's 4.6L 3-valve V8 engine used in the 2006-2010 Ford ...
The Alfa Romeo Twin Spark engine, introduced in the 1987 Alfa Romeo 75, also uses variable valve timing. [3] [4] The Alfa system varies the phase (not the duration) of the cam timing and operates on the inlet camshaft. [5] Alfa Romeo's variator is a cylindrical chamber that contains a pressure chamber and piston along with helical splines.