Z20NET Spec Sheet

[Jezzy]

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.

[Jezzy]

First revision is complete, I've added part numbers for some commonly replaced parts specific to this engine, some more diagrams of the engine and labelled some of the major components. As before, suggestions/revisions welcome.





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

Turbocharger
Garrett GT 2052S

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 begins to open at
107 C, fully open at 120 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.


Commonly replaced parts
Charged air bypass valve, Vauxhall part number 55354158
Oil filter element, 93175493
O-ring seal for oil filter, 90537437
Mass air flow sensor, 24452491
Thermostat and flange, 90537811




Engine from the front:





Engine from the rear:





Component location:



Key:
1 Air box
2 Brake fluid reservoir
3 Coolant reservoir
4 Mass air flow sensor
5 Spark plugs and ignition coils cover
6 Turbocharger heat shield
7 Oil cooler
8 Air conditioning low pressure pipe valve
9 Coolant return pipe ventilation valve
10 Fuel rail de-pressurising valve
11 Alternator
12 Charged air boost control valve

[sy_uk]

Maybe a sticky for veccy/siggy engines, then inside that post links to each engines own "non-stickied" thread?

[Deztroyer]

sticky created

[Deztroyer]

Jezzy,

additional component for Tubo solenoid

looks identical to the charged bypass valve that so many of us have fitted and works in tandem with it - do not confuse them as they do have different reference values and will not effectively work if reversed

Vauxhall part no 12787706 description "valve"

location as per your picture of the engine with the cover removed ..
located above the dipstick with 3 pipes and electrical connector coming out of the unit .

my advice is if your fitting "Charged air bypass valve, Vauxhall part number 55354158" you fit this one as well - belt and braces but for around a tenner might save you an additional trip to the dealers

regards

Dez

[Jezzy]

Pictures of the rarely seen turbo side of the Z20NET:

[Jezzy]

Air/fuel flow diagram (not to scale), from Saab:





KEY

1. Check valve, crankcase ventilation
2. Air filter
3. Mass air flow sensor (MAF)
4. Turbo
5. Charge air cooler
6. By-pass valve
7. Solenoid valve, turbo by-pass
8. Throttle body actuator
9. Intake air temperature sensor
10. Manifold absolute pressure sensor
11. Engine
12. Crankcase ventilation, oil trap
13. Check valves
14. EVAP canister purge valve
15. Evaporative emission canister
16. Wastegate valve
17. Charge air regulator
18. Boost pressure control valve
19. Oxygen sensor
20. Catalytic convertor
21. Exhaust temperature sensor
22. Front silencer
23. Rear silencer
24. Vacuum pump
25. Brake servo
26. Check valve
27. Fuel pressure regulator
28. Atmospheric pressure sensor

[leesri]

whats the part that bolts on the side of the cam cover at the side round shape thing ??

[Jezzy]

This one?




That's the vacuum pump.

[leesri]

yes mate that's it, should it make a tapping rattle clicking sound??