Ford 3 Valve Engine Diagram
The 4 valve setup was also available with this engine, introduced in 1999 in the Lincoln Navigator and used in the Navigator for 5 years before it switched to the 3 valve setup. Other 4 valve applications were primarily used in sports cars. The 5.4L Triton is an engine that has been around for a considerable amount of time.
Fiesta 1996 (08.1995-02.2002) > Ford Workshop Manuals > Mechanical Repairs > 3 Powertrain > 303 Engine > 303-01A Engine - 1.3L Endura-E (HCS) > Specifications
That leads to an out of time engine with valve damage and metal particles throughout the engine. This system is fairly complicated so check out the full description an operation of the Ford 5.4L Variable Cam Timing. I also wrote a guide to replacement of all these components in another article Changing Ford 5.4L Phasers and Timing Chain.
The Duratec 3.7 V-6 is actually what the engineers call a "mild Atkinson-cycle" engine, where the variable intake valve mechanism keeps the intake valve open much longer than in a standard engine for better mixing in the chamber, thus reduced pumping work and better fuel economy. 2011 Ford Mustang Engine 24 Valves And Twin Independant Camshafts
Engine Valves, Push Rods, Rocker Arm Cover and Related Parts - Typical 1965-1972 6 Cylinder 240 and 300. 900 x 962, 94K: Engine Valves, Push Rods, Rocker Arm Cover and Related Parts - Typical 1965-1972 8 Cylinder 352, 360 and 390. 1024 x 858, 132K: Engine Oil Pump - Rotor Type and Related Parts - Typical 1965-1972 6 Cylinder 240 and 300
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