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For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
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.
Its solid-lifter cam, known as the "30-30 Duntov" cam named after its 0.03 in (0.8 mm)/0.030 in hot intake/exhaust valve-lash and Zora Arkus-Duntov (the first Duntov cam was the 0.012 in (0.3 mm)/0.018 in (0.5 mm) 1957 grind known as the '097, which referred to the last three digits of the casting number) the "Father of the Corvette", was also ...
Despite revisions that included a higher-lift camshaft and revised combustion chamber shape, [30] power and torque outputs for the carburetted 3.3 and 4.1 litre engines fell to 88 kW (118 hp) and 97.5 kW (130.7 hp), although maximum power output from the 4.1 EFI engine increased slightly to 121 kW (162 hp). [31]
The camshaft VCT (phaser) design was changed to improve reliability and reduce the development of an engine start-up tapping/rattling noise over time. Ford uses a single piston cooling jet per cylinder, but the oil volume was increased. The underside of the pistons were also redesigned to better transfer heat into the oil.
The camshaft has three camshaft bearings. A lid made of cast iron covers the camshaft spur gears; the ignition distributor is placed on top of this lid and is driven by the camshaft spur gears. For powering the fuel pump, the camshaft is fitted with an extra cam located in the bearing on the flywheel side. [11]
An early experimental 200 hp Clerget V-8 from the 1910s used a sliding camshaft to change the valve timing [citation needed]. Some versions of the Bristol Jupiter radial engine of the early 1920s incorporated variable valve timing gear, mainly to vary the inlet valve timing in connection with higher compression ratios. [ 6 ]
Firing order was 1-6-5-4-3-2. [8] This engine was last produced for the 2003 Dodge Dakota pickup. Starting in the 2004 model year, it was entirely withdrawn from production and replaced with the 3.7L PowerTech V6 engine. [16] Applications: 1992–2003 Dodge Dakota; 1992–2003 Dodge Ram Van/Dodge Ram Wagon; 1992–2001 Dodge Ram