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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.
The new V8s were marketed under the "Triton" name and mark the first use of Ford's Modular single overhead cam (SOHC) engines in the F-Series pickups. Ford's own 8.8 independent front suspension replaced the Dana 44 Twin-I-Beam front end, while the Ford 8.8 rear axle remained standard.
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 V10—6.8 L SOHC 90° Modular V10 truck engine 1999–2005 Ford-Cosworth JD / VJ engine ( Formula One engine ) 1999–2005 Ford-Cosworth CR engine ( Formula One engine )
Three engines were offered with the 2009 redesign: a revised 5.4L 3-valve-per-cylinder Triton V8 that is E85 capable with an output rating of 320 hp (239 kW) and 395 lb⋅ft (536 N⋅m) of torque (both ratings on E85), a 292 hp (218 kW) 4.6L 3-valve-per-cylinder V8, and a 248 hp (185 kW) 4.6L 2-valve V8.
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.
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