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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).
At the introduction of the 24v DOHC engine in the Senator/Carlton/Omega, the 2.5 was enlarged to 2.6 litres. With a reworked 12-valve cylinder head and RAM induction it now produced 150 PS (110 kW; 148 hp). This engine was also fitted to southeast Asian export market versions of the Holden VP, VR, and VS Commodores between around 1992 and 1997 ...
As engine speeds increased through the 20th century, single overhead camshaft (SOHC) engines— where the camshaft is located within the cylinder head near the top of the engine— became increasingly common, followed by double overhead camshaft (DOHC) engines in more recent years. For OHC and DOHC engines, the camshaft operates the valve ...
The Ford I4 DOHC engine is a cast iron block 4-cylinder inline internal combustion engine with twin overhead camshafts, produced by the Ford Motor Company at Dagenham Engine Plant. It was initially available as a 2.0-litre 8-valve version, and later in 2.0 and 2.3-litre 16-valve versions from 1989 to the end of production of the MK2 Ford Galaxy ...
OHC engines always have fewer parts when comparing systems with the same number of valves and cylinders (4 cylinder 2 valve OHC engine to 4 cylinder 2 valve OHV engine). Though it is true that some OHC engines do come close to the high moving part count of an OHV engine it is very rare.
The Quad 4 is the first domestic regular production DOHC four-cylinder engine wholly designed and built by GM, the only similar prior example being the Chevrolet Cosworth Vega, whose DOHC head was designed by Cosworth in England. In addition to the 2.3-liter DOHC Quad 4s, there was also a short-lived 2.3-liter SOHC variant called the "Quad OHC ...
In 1982 the German company Dr. Schrick GmbH, later renamed AVL Schrick, developed a double overhead camshaft (DOHC) multi-valve cylinder head for the 1.6 L CVH block. [20] [21] Each of the two overhead camshafts is installed in a separate camshaft carrier that is attached to the main body of the cylinder head. Each carrier has its own cam cover.
The engines with 2.5 L (2,490 cc) displacement, identified as the Volvo Penta AQ151 (8 valve) and AQ171 (dohc 16 valve) models, got a forged crankshaft with a longer stroke of 86 mm (3.39 in) together with pistons with a 3 mm (0.12 in) lower compression height. The 2.5 L (2,490 cc) blocks still had B230 cast in the block.