Opel cam-in-head engine

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. Both four- and six-cylinder inline configurations were produced. The name derives from the location of the camshaft, which was neither cam-in-block nor a true overhead camshaft. 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 valves are actuated through very short tappets and rocker arms. 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. A large capacity 2.4L four-cylinder version continued until 1998.

Opel cam-in-head engine
A 4-cylinder 1,979cc (20E) fuel injected CIH engine in a 1984 Vauxhall Carlton (Opel Rekord E)
Overview
Production1965 - 1998
Layout
ConfigurationInline-4, Inline-6
Displacement
  • Four-cylinders:
  • 1.5 L; 91.0 cu in (1,492 cc)
  • 1.6 L; 96.7 cu in (1,584 cc)
  • 1.7 L; 103.6 cu in (1,698 cc)
  • 1.9 L; 115.8 cu in (1,897 cc)
  • 2.0 L; 120.8 cu in (1,979 cc)
  • 2.2 L; 134.1 cu in (2,197 cc)
  • 2.4 L; 147.1 cu in (2,410 cc)
  • Six-cylinders:
  • 2.2 L; 136.6 cu in (2,239 cc)
  • 2.5 L; 151.9 cu in (2,490 cc)
  • 2.6 L; 158.3 cu in (2,594 cc)
  • 2.8 L; 169.9 cu in (2,784 cc)
  • 3.0 L; 181.1 cu in (2,968 cc)
  • 3.6 L; 220.6 cu in (3,615 cc)
Cylinder bore
  • 82.5 mm (3.25 in)
  • 85 mm (3.35 in)
  • 87 mm (3.43 in)
  • 88 mm (3.46 in)
  • 88.8 mm (3.50 in)
  • 92 mm (3.62 in)
  • 93 mm (3.66 in)
  • 95 mm (3.74 in)
Piston stroke
  • 69.8 mm (2.75 in)
  • 77.5 mm (3.05 in)
  • 85 mm (3.35 in)
Cylinder block materialCast iron
Cylinder head materialCast iron
Aluminium
Valvetrain
Compression ratio8.25:1, 9.0:1, 9.5:1
Combustion
TurbochargerGarrett T25 Twin-turbos (Lotus Carlton-Omega)
Fuel systemCarburettor
Multi-port fuel injection
ManagementBosch L-Jetronic, LE-Jetronic or Motronic
Fuel typePetrol
Diesel
Oil systemWet sump
Cooling systemWater-cooled
Output
Power output58–382 PS (43–281 kW; 57–377 hp)
Torque output174–568 N⋅m (128–419 lb⋅ft)
Chronology
Predecessor
Successor

A diesel version of the CIH was also developed. This engine debuted in the Opel Rekord D in 1972.

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