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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).
The single-over-head-camshaft design requires less under-hood space than the more conventional dual overhead camshafts normally used with 16-valve, 4-cylinder engines. The adoption of a sophisticated knock control system optimizes ignition timing and allows for a higher compression ratio (9.3:1 from 8.8:1).
The Fiat Twin Cam (also known as the Lampredi Twin Cam) is an advanced double overhead camshaft inline-four automobile engine produced from 1966 through 2000 as a Fiat/Lancia engine. Designed by ex Ferrari engineer Aurelio Lampredi , the engine was produced in a large number of displacements, ranging from 1.3 to 2.0 L (1,297 to 1,995 cc) and ...
6v: two valves per cylinder, 6 valves total, single overhead camshaft (SOHC), compression ratio: 10.3:1 12v: four valves per cylinder, 12 valves total, double overhead camshafts (DOHC), compression ratio: 10.5:1 aspiration plastic intake manifold fuel system, ignition system & management
The SOHC (LK0/L24) cylinder head had 8 valves and was made of lost foam cast aluminum. The camshaft was located in the center of the cylinder head and driven by a chain off the front crankshaft sprocket. Motion from the camshaft was transmitted to the eight valves by the hydraulic lifters and rocker arms.
Early models came with a single row timing chain until 1983 [1] and were plagued with chain failure problems which Mercedes-Benz would repair free of charge, changing the timing chain to a dual row thus resolved the problem making these engine as durable and reliable as any other Mercedes V8. All 1984 and 1985 3.8 V8 models came with a double ...
A single overhead camshaft (SOHC) design was introduced by Pontiac in the 1966 model year as the standard engine in the Tempest. Offered also in 1967, the 230 cu in (3.8 L) OHC 6 shared internal dimensions with the overhead valve Chevrolet straight-6 engine it was based on, [citation needed] but had unique cast iron block and head castings ...
Chief differences between this version and the A588 include a cast aluminum SOHC cylinder head that more easily passes exhaust gases than the base engine, a camshaft that is optimized for higher engine speeds, a factory welded exhaust short-tube header instead of a cast exhaust manifold, and a two-piece intake manifold. This manifold features ...