Because I can do a good impression of a geek, and because I like my engine, I've drawn up what I hope will become a sticky once it's finished, and act as a reference guide to the Z20NET for forum members.

At the moment it consists of a picture of the engine, some facts and figures, and BHP and torque curves.

Please feel free to point out any inaccuracies, and make suggestions for additional information that should be included, and if you also have that information to hand, so much the better.







Engine designation:


Vauxhall:
Z20NET (Z = Euro4 emissions standard, 20 = 2.0 litre, N = compression ratio 9.0-9.5:1, E = injection, T = turbocharged)
Saab:
B207L


Engine installation
Front, transverse in front of axle, 10° backward inclined

Cooling system
Liquid, sealed circuit

Cylinders, number
4

No 1 cylinder location
At timing chain end

Bore (mm)
86

Stroke (mm)
86

Displacement (cc)
1998

Compression ratio
9.5 : 1

Engine, type
In line; 5 main bearings

Cylinder block/ head material
Aluminium/ aluminium

Camshaft(s), location
2 overhead (DOHC), driven by chain

Valve train
Roller rocker with hydraulic bucket tappets

Valve, arrangement
v; 4 per cylinder

Valve, adjustment
Automatic – hydraulic

Fuel system
Sequential multi point fuel injection

Ignition system
Electronic ignition map, ignition coil direct to spark plug

Fuel pump
Electric, in tank

Emission control system
3 - way cat. conv. with 2 oxygen sensors

Output
129 kW / 175 BHP at 5500 RPM

Specific power (kW/l; hp/l)
64.6; 87.6

Max. torque (Nm at 1/min)
265 kW / 195 lb ft at 2500 RPM

Specific torque (Nm/litre)
132.6

Mean effective pressure at max. power/ max. torque (Nm/litre)
1408.7/ 1667.5

Average piston speed (m/s)
15.8

Number of camshaft bearings
6 per camshaft


Lubrication:

Engine oil, capacity (l)
6

Difference between Min and Max markings on dipstick
1 litre

Oil filter type
Disposable paper cartridge, top mounted

Oil filter nut size
32mm

Oil filter nut torque setting
25 Nm / 18 lb ft

Sump drain plug torque setting
25 Nm / 18 lb ft

Minimum oil pressure at 80 C:
Crankcase
2.0 bar at 1000 RPM

Cylinder head
0.8 bar at 1000 RPM

Oil pressure warning switch activates at
0.3 bar

Oil cooler thermostat opens at
107 C (No thermostat fitted from 2008 onwards - oil cooling at all temperatures)


Coolant capacity (l)
7.5

Battery 12V, capacity (Ah)
66

Alternator 14.2V, capacity (W)
1704

Max. service interval
20,000 miles or 2 years

Emission compliance
Euro 4

OEM spark plug brand/type
NGK PFR6T-10G

Electrode gap
0.9mm to 1.0mm

Spark plug torque setting
28 Nm / 21 lb ft

Firing order
1-3-4-2.