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The firing order has been changed from that shared by all previous Modular V8s (1-3-7-2-6-5-4-8) to that of the Ford Flathead V8 (1-5-4-8-6-3-7-2). [17] Compression ratio is 11.0:1, and despite having port fuel injection (as opposed to direct injection) the engine can still be run on 87 octane gasoline.
When the 390 was first offered for 1961 model there was a 375 horsepower (280 kW) High Performance version that featured an aluminum 4bbl intake manifold, cast iron "header" style exhaust manifolds, 10.5:1 compression ratio and a solid lifter valve train.
Initially, the 4.6 L Triton engine and the new 3-valve 5.4 L three-valve-per-cylinder Triton V8 engines, respectively mated to a 4R70E and 4R75E four-speed automatic transmission, were the only two powertrain combinations available to the retail public on the new trucks.
1997–present Triton V8—truck versions of the Modular; 2003–2004 Terminator V8 DOHC Supercharged 4.6 L; 2010–2016 'Ford Miami Coyote V8 based Ford Australia Ford Performance Vehicles 5.0 L Supercharged DOHC VCT on intake cams only; 2011–present Coyote V8 —DOHC TiVCT 5.0 L; In 2018 dual fuel injection added providing both port and ...
The intake manifold fed both banks from inside the vee, but the exhaust ports had to pass between the cylinders to reach the outboard exhaust manifolds, since it did not use a t-head configuration. Such an arrangement transferred exhaust heat to the block, imposing a large cooling load; it required far more coolant and radiator capacity than ...
The base 4.6 L Triton V8 engine was dropped for the 2005 model year as the 5.4 L Triton V8 was made standard on all Expeditions and updated with 24-valve technology and variable valve timing. The Expedition also received a significantly updated version of the four-speed 4R70W automatic transmission.