Saab H engine

Saab H engine
Naturally aspirated B202 16 valve engine
Overview
Manufacturer	Saab Automobile
Also called	Ecopower Family III engine
Production	1981-2009
Combustion chamber
Configuration	Inline-4
Displacement	1,985 cc (121.1 cu in) 2,119 cc (129.3 cu in) 2,290 cc (140 cu in)
Cylinder bore	90 mm (3.5 in) 93 mm (3.7 in)
Piston stroke	78 mm (3.1 in) 90 mm (3.5 in)
Cylinder block alloy	Cast iron
Cylinder head alloy	Aluminum
Valvetrain	SOHC DOHC
Compression ratio	9.25:1 9.2:1 10.0:1 10.1:1 10.5:1
Combustion
Fuel system	Carburetor Fuel injection
Management	Bosch K-Jetronic Bosch LH-Jetronic Lucas CU14 Saab Trionic
Fuel type	Gasoline
Oil system	Wet sump
Cooling system	Water-cooled
Chronology
Predecessor	Saab B engine
Successor	GM Ecotec engine

The Saab H engine is a redesign of the Saab B engine, which in turn was based on the Triumph Slant-4 engine.

Despite the name it is not an H engine or horizontally opposed engine, but a slanted inline-4. The H engine was introduced in 1981 in the Saab 900 and was also used in the Saab 99 from 1982 onwards. It continued in use in the 900/9-3, 9000, and 9-5. The 2003 GM Epsilon-based 9-3 switched to the GM Ecotec engine, leaving the 9-5 as the sole user of the H engine. The last model year for this family of engines was 2009. The tooling and know-how was sold to BAIC.

All versions feature a grey cast iron block and an aluminum head with a single or double overhead chain driven camshafts. SOHC engines use two valves per cylinder and DOHC versions use four valves per cylinder with a pentroof chamber, the valve angle being 22 degrees from vertical. All engines use flat inverted bucket type valve lifters, hydraulic in the case of DOHC engines.

The engines were given numbers, for instance B201 is a 2.0 litre (20) engine with one camshaft.

B201 is the original H engine with two valves per cylinder and a single overhead camshaft. It was introduced in 1981 and unlike the B engine it did not have the central shaft which used to power the distributor, oil- and coolant pump. Instead the distributor is located at the front of the cylinder head and directly driven by the camshaft, while the integrated waterpump was replaced with a separate unit to the rear of the engine.

It was available with 100 PS (74 kW; 99 hp) at 5200 rpm using a single carburettor, 108 PS (79 kW; 107 hp) at 5200 rpm using a dual carburettor, 118 PS (87 kW; 116 hp) at 5500 rpm using Bosch K-Jetronic fuel injection and a turbocharged, fuel injected version with 145 PS (107 kW; 143 hp) at 5000 rpm. In 1986 an intercooled version of the turbo engine also became available, it produces 155 PS (114 kW; 153 hp) at 5500 rpm.