GM / Chevy 2H0

The Opel 2H0 is a 1.8 l (1,796 cc, 109.6 cu-in) straight-four four-stroke natural aspirated gasoline engine from the third generation of GM Family 1. This is the same engine as Opel A18XER.

The 2H0 engine uses a cast grey iron block with five-bearings crankshaft and aluminum head with dual overhead camshafts (DOHC) and four valves per cylinder (16 valves in total). The engine is equipped with a sequential fuel injection system, Double Continuous Variable Cam Phasing (DCVCP), Variable Two Step Runner Length Intake Manifold, Electronic Throttle Control, Electronic Controlled Cooling System, Cylinder Selective Adaptive Knock Control, Engine Oil Cooler with Individual Piston Cooling Jets, Coil on Plug High Energy Ignition, Extended Life Coolant.

Cylinder bore and piston stroke are 80.5 mm (3.17 in) and 88.2 mm (3.47 in), respectively and compression ratio rating is 10.5:1. The 2H0 engine produces 140 PS (103 kW; 138 HP) at 6,300 rpm of maximum horsepower and 175 Nm (17.8 kg·m; 129.1 ft·lb) at 3,800 rpm of maximum torque.

General information

Cylinder block

The 2H0 cylinder block is based on the proven hollow-frame concept. Gray cast iron provides an extremely durable foundation, optimized with a deep skirt that minimizes both wear and vibration. Pistons apply a floating-pin design. The wrist pins, which attach the piston to the connecting rod, “float” inside the rod bushing and pin bores in the piston barrel. Pistons also have oil-spray cooling. Each piston has its own individual directed jet that sprays oil toward its skirt, coating its underside and the cylinder wall with an additional layer of lubricant.

Connecting rod bearing cap bolt tightening procedure and torque specs:

• Step 1: 35 Nm (3.6 kg·m; 25.8 ft·lb)
• Step 2: Turn all bolts 45°
• Step 3: Turn all bolts 15°

Crankshaft Bearing Cap Bolt:

• Step 1: 50 Nm (5.1 kg·m; 36.9 ft·lb)
• Step 2: Turn all bolts 45°
• Step 3: Turn all bolts 15°

Cylinder head

The cylinder head is made of an aluminum alloy. The 2H0 engine has Double Continuous Variable Cam Phasing (DCVCP) on the intake and exhaust sides. The camshafts are driven by timing belt. The engine has a composite intake manifold and fabricated stainless steel maniverter 4-1 with a close-coupled catalyst.

Head tightening procedure and torque specs:

• Step 1: 25 Nm; 2.5 kg·m; 18.5 ft·lb)
• Step 2: Turn all bolts 90°
• Step 3: Turn all bolts 90°
• Step 4: Turn all bolts 90°
• Step 5: Turn all bolts 45°

Maintenance data

Vehicle applications

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.