![]() As with most of Opel's engines of the 1960s and 1970s, versions optimized for low and high octane fuel were offered, with the 15N for normal and the 15S for super. This is the smallest of the three original CIH engines introduced simultaneously. Later engines of over two litres received longer strokes up to 77.5 mm (3.05 in) for the 2.2 and 85 mm (3.35 in) for the 2.4 (also used for the 3.6 litre inline-six version).įour-cylinder versions 1.5 litre I4 The CIH engine was oversquare, with the original three versions having a stroke of only 69.8 mm (2.75 in). The head and block are both made from cast iron. This led to lowered fuel economy but was considerably cheaper to manufacture. The cylinder head is a non-crossflow layout. While the earliest engines used mechanical lifters, later versions used hydraulic tappets, which Opel pioneered for mass market production in the Family II unit which ultimately replaced the CIH. The camshaft is driven by a roller chain. Rather it can be thought of as a cam-in-block engine with a greatly shortened valve drivetrain. Īlthough the camshaft is in the cylinder head, the CIH is not a true overhead camshaft design. The original design of the cam-in-head engine was done by General Motors in Detroit, Michigan. This engine debuted in the Opel Rekord D in 1972. A large capacity 2.4L four-cylinder version continued until 1998.Ī diesel version of the CIH was also developed. The engine first appeared in the Opel Rekord B in 1965, and was largely replaced in four-cylinder form by the GM Family II unit as Opel/Vauxhall's core mid-size engine in the 1980s, with the six-cylinder versions continuing until 1994 in the Omega A and Senator B. The valves are actuated through very short tappets and rocker arms. In the CIH engine the camshaft is located in the cylinder head but sits alongside the valves rather than above them, so therefore effectively is still an overhead valve design. The name derives from the location of the camshaft, which was neither cam-in-block nor a true overhead camshaft. Both four- and six-cylinder inline configurations were produced. The Opel cam-in-head engine (CIH) is a family of automobile engines built by former General Motors subsidiary Opel from 1965 until 1998, appearing extensively in Opel/Vauxhall badged cars during this period.
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