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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 compression ratio was increased from 10.0:1 to 10.5:1 on lower output versions; higher output versions such as the 3.5L EcoBoost HO in the F-150 Raptor, have lower compression ratios like 10.0:1 and as low as 9.0:1 in the Ford GT. The camshaft VCT (phaser) design was changed to improve reliability and reduce the development of an engine ...
The Ford Modular engine is an overhead camshaft (OHC) V8 and V10 gasoline-powered small block engine family introduced by Ford Motor Company in 1990 for the 1991 model year. . The term “modular” applied to the setup of tooling and casting stations in the Windsor and Romeo engine manufacturing plants, not the engine its
4.2 L Essex V6 in a 1998 F-150. The largest displacement version of the Essex V6 appeared in the 1997 model year as a replacement for the Ford 300 straight six in the F-150. This engine kept the 3.8 L's bore, but featured a stroke lengthened to 95 mm (3.74 in), bringing its displacement up to 4,195 cc (256.0 cu in).
It was replaced by the 4.2 L Essex V6 for 1997 in the redesigned F-150, as well as the E-150 and E-250. The 300 was mated to the Ford C6, E4OD, and AOD automatic transmissions, and the Mazda M5OD, ZF S5-42 and S5-47, 5-speed manual transmissions, and the Borg-Warner T18, Tremec RTS, and New Process NP435 4-speed manual transmissions.
SOHC design (for a 1973 Triumph Dolomite Sprint) . The oldest configuration of overhead camshaft engine is the single overhead camshaft (SOHC) design. [1] A SOHC engine has one camshaft per bank of cylinders, therefore a straight engine has a total of one camshaft and a V engine or flat engine has a total of two camshafts (one for each cylinder bank).
Cylinder head of Honda K20Z3.This engine uses continuously variable timing for the inlet valves. Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions.
A helical camshaft is a type of mechanical variable valve actuation (VVA) system. More specifically, it is a camshaft that allows the valve opening duration to be varied over a wide, continuous, step-less range, with all of the added duration being at full valve lift.