Opel cam-in-head engine

Opel cam-in-head engine
A 4-cylinder 1,979cc (20E) fuel injected CIH engine in a 1984 Vauxhall Carlton (Opel Rekord E)
Overview
Production	1965 - 1998
Layout
Configuration	Inline-4, Inline-6
Displacement	Petrol four-cylinders: 1.5 L (1,492 cc; 91 cu in) 1.6 L (1,584 cc; 97 cu in) 1.7 L (1,698 cc; 104 cu in) 1.9 L (1,897 cc; 116 cu in) 2.0 L (1,979 cc; 121 cu in) 2.2 L (2,197 cc; 134 cu in) 2.4 L (2,410 cc; 147 cu in) Diesel four-cylinders: 2.0 L (1,998 cc; 122 cu in) 2.1 L (2,068 cc; 126 cu in) 2.3 L (2,260 cc; 138 cu in) Petrol six-cylinders: 2.2 L (2,239 cc; 137 cu in) 2.5 L (2,490 cc; 152 cu in) 2.6 L (2,594 cc; 158 cu in) 2.8 L (2,784 cc; 170 cu in) 3.0 L (2,968 cc; 181 cu in) 3.6 L (3,615 cc; 221 cu in)
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 material	Cast iron
Cylinder head material	Cast iron Aluminium
Valvetrain	Single cam-in-head 2 valves/cyl. DOHC 4 valves/cyl.
Compression ratio	8.25:1, 9.0:1, 9.5:1
Combustion
Turbocharger	Garrett T25 Twin-turbos (Lotus Carlton-Omega)
Fuel system	Carburettor Multi-port fuel injection
Management	Bosch L-Jetronic, LE-Jetronic or Motronic
Fuel type	Petrol Diesel
Oil system	Wet sump
Cooling system	Water-cooled
Output
Power output	58–382 PS (43–281 kW; 57–377 hp)
Torque output	174–568 N⋅m (128–419 lb⋅ft)
Chronology
Predecessor	Vauxhall Slant-4 engine Opel Straight-6 engine (I6)
Successor	GM Family 1 engine (1.5-1.7 L) GM Family II engine (1.8-2.4 L) GM 54-Degree V6 engine (I6)

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.

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