The Nissan Z20E is a 2.0 liter (1952 cc) straight-four, four-stroke cycle gasoline from Nissan Z-family. The Z20E engine was producted from 1979 through 1988.
The Nissan Z20E engine features a cast-iron block and aluminum alloy cylinder head with two ignition plugs per cylinder. It has a single overhead camshaft and 8 valves (2 per cylinder).
The Z20E engine was equipped with the EFI system. It had longer connecting rods and shorter compression-height pistons than the carbureted Z20S engine. The Z20E engine was not available in the 720 pickups, which only used carbureted versions.
All Nissan Z20E engines for the US domestic market was known as NAPS-Z (NAPZ or NAPS-Z Nissan Anti-Pollution System), NAPZ motors had a dual spark-plugs head. (two per cylinder).
The Z20E engine has an 85 mm (3.34 in) cylinder bore and 86 mm (3.38 in) piston stroke with a compression ratio of 8.5:1. It produced 99 HP (100 PS, 86 kW) at 5,200 rpm of horsepower and 167 Nm (17.0 kg·m, 123 ft-lb) at 3,600 rpm of torque.
The breakdown of the engine code is as follows:
- Z – Engine Family
- 20 – 2.0 Liter Displacement
- E – Multi Point Fuel Injection
General information
| Engine Specifications | |
| Engine code | Z20E |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | 1979-1988 |
| Displacement | 2.0 L, 1,952 cc (121.92 cu in) |
| Fuel system | Multi Point Fuel Injection |
| Power adder | None |
| Max. horsepower | 99 HP (100 PS, 86 kW) at 5,200 rpm |
| Max. torque | 167 Nm (17.0 kg·m, 123 ft-lb) at 3,600 |
| Firing order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
The Z20E engine has a cast-iron cylinder block, bore is 85 mm (3.34 in) and stroke is 86 mm (3.38 in). The cylinder block, a monoblock specially cast structure, employs the five bearing support system. The pistons are each fitted with two compression rings and a single oil ring.
| Cylinder block | ||
| Cylinder block alloy | Cast iron | |
| Compression ratio: | 8.5:1 | |
| Cylinder bore: | 85 mm (3.34 in) | |
| Piston stroke: | 86 mm (3.38 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter (standard): | 85.000-85.050 mm (3.3465-3.3484 in) | |
| Piston skirt diameter (standard): | 84.985-85.035 mm (3.3459-3.3478 in) | |
| Piston pin outer diameter: | 20.993-20.998 mm (0.8265-0.8267 in) | |
| Piston ring side clearance: | Top | 0.040-0.073 mm (0.0016-0.0029 in) |
| Second | 0.030-0.063 mm (0.0012-0.0025 in) | |
| Oil | – | |
| Piston ring end gap: | Top | 0.25-0.40 mm (0.0098-0.0157 in) |
| Second | 0.15-0.30 mm (0.0059-0.0118 in) | |
| Oil | 0.30-0.90 mm (0.012-0.035 in) | |
| Crankshaft journal diameter: | 54.942-54.955 mm (2.1631-2.1336 in) | |
| Crankpin diameter: | 49.961-49.974 mm (1.9670-1.9675 in) | |
| Crankshaft center distance: | 42.97-43.03 mm (1.6917-1.6941 in) | |
Cylinder head
The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. Intake valves are 42 mm in diameter and the exhaust valves are 38 mm.
| Cylinder head | ||
| Valve Arrangement: | SOHC, chain drive | |
| Valves: | 8 (2 valves per cylinder) | |
| Intake/Exhaust duration: | – | |
| Valve head diameter: | INTAKE | 42.0-42.2 mm (1.654-1.661 in) |
| EXHAUST | 38.0-38.2 mm (1.496-1.4504 in) | |
| Valve length: | INTAKE | 122.8-123.1 mm (4.835-4.846 in) |
| EXHAUST | 123.6-123.9 mm (4.866-4.878 in) | |
| Valve stem diameter: | INTAKE | 7.965-7.980 mm (0.3136-0.3142 in) |
| EXHAUST | 7.945-7.960 mm (0.3128-0.3134 in) | Cam height: | INTAKE/EXHAUST | 38.477-38.527 mm (1.5148-1.5168 in) |
| Outer camshaft journal diameter: | 32.935-32.955 mm (1.2967-1.2974 in) | |
Tightening torque specs
| Tightening torque specs | |
| Front cover bolt | M8: 10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb M6: 3.9-9.8 Nm; 0.4-1.0 kg·m; 2.9-7.2 ft·lb |
| Chain guide bolt | 5.9-9.8 Nm; 0.6-1.0 kg·m; 4.3-7.2 ft·lb |
| Chain tensioner bolt | 5.9-9.8 Nm; 0.6-1.0 kg·m; 4.3-7.2 ft·lb |
| Water pump bolt | M8: 10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb M6: 3.9-9.8 Nm; 0.4-1.0 kg·m; 2.9-7.2 ft·lb |
| Crank pulley bolt | 118-157 Nm; 12-16 kg·m; 87-116 ft·lb |
| Water inlet bolt | 10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb |
| Water outlet bolt | 10-16 Nm; 1.0-1.6 kg·m; 7-12 ft·lb |
| Intake manifold bolt and nut | 16-21 Nm; 1.6-2.1 kg·m; 12-15 ft·lb |
| Alternator bracket bolt | 39-59 Nm; 4.0-6.0 kg·m; 29-43 ft·lb |
| Alternator to adjusting bar bolt | 20-29 Nm; 2.0-3.0 kg·m; 14-22 ft·lb |
| Engine mounting bracket bolt | 29-39 Nm; 3.0-4.0 kg·m; 22-29 ft·lb |
| Exhaus manifold bolt and nut | 16-21 Nm; 1.6-2.1 kg·m; 12-15 ft·lb |
| EGR tube nut | 34-44 Nm; 3.5-4.5 kg·m; 25-33 ft·lb |
| EAI tube nut | 34-44 Nm; 3.5-4.5 kg·m; 25-33 ft·lb |
| Cylinder head bolt | 69-78 Nm; 7.0-8.0 kg·m; 51-58 ft·lb |
| Cylinder head to front cover bolt | 3.9-7.5 Nm; 0.4-0.7 kg·m; 2.9-5.8 ft·lb |
| Rocker shaft bracket bolt | 15-25 Nm; 1.5-2.5 kg·m; 11-18 ft·lb |
| Camshaft sprocket bolt | 118-157 Nm; 12-16 kg·m; 87-116 ft·lb |
| Rocker cover bolt | 7.8-9.8 Nm; 0.8-1.0 kg·m; 5.8-7.2 ft·lb |
| Rocker arm nut | 16-22 Nm; 1.6-2.2 kg·m; 12-16 ft·lb |
| Main bearing cap bolt | 44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb |
| Connecting rod big end nut | 44-54 Nm; 4.5-5.5 kg·m; 33-40 ft·lb |
| Gusset to cylinder block | 43-58 Nm; 4.4-5.9 kg·m; 32-43 ft·lb |
| Flywheel bolt (M/T) | 137-157 Nm; 14-16 kg·m; 101-116 ft·lb |
| Drive plate bolt (A/T) | 137-157 Nm; 14-16 kg·m; 101-116 ft·lb |
| Clutch cover bolt (M/T) | 16-21 Nm; 1.6-2.1 kg·m; 12-15 ft·lb |
| Torque coverter bolt (A/T) | 39-49 Nm; 4.0-5.0 kg·m; 29-36 ft·lb |
| Starter motor bolt | 29-39 Nm; 3.0-4.0 kg·m; 22-29 ft·lb |
| Transmission to cylinder block bolt | 43-58 Nm; 4.4-5.9 kg·m; 32-43 ft·lb |
| Transmission to gusset bolt | 43-58 Nm; 4.4-5.9 kg·m; 32-43 ft·lb |
Maintenance data
| Valve clearance (HOT) | |
| Intake valve | 0.30 mm (0.012 in) |
| Exhaust valve | 0.30 mm (0.012 in) |
| Compression pressure | |
| Standard | 12.0 kg/cm2 (11.77 bar, 171 psi) / 350 rpm |
| Minimun | 9.0 kg/cm2 (8.83 bar, 128 psi) / 250 rpm |
| Oil system | |
| Oil consumption , L/1000 km (qt. per miles) | up to 0.5 (1 qt. per 1200 miles) |
| Recommended engine oil | 5W-30 5W-40 10W-30 10W-40 |
| Oil type API | SE |
| Engine oil capacity (Refill capacity) | With filter change 4.4 l Without filter change 3.9 l |
| Oil change interval, km (miles) | 5,000-10,000 (3,000-6,000) |
| Ignition system | |
| Ignition timing (B.T.D.C./rpm) | 6-12°/600 rpm (depends on the country and vehicle model) |
| Spark plug | Cold: BP7ES, BPR7ES Standard: BP6ES, BPR6ES Hot: BP5ES, BPR5ES |
| Spark plug gap | 0.8-0.9 mm (0.03 -0.035 in) |
| Spark plug tightening torque | 15-20 Nm; 1.5-2.0 kg·m; 11-14 ft·lb |
Vehicle applications
| Model | Years Produced |
| Datsun 200SX (S110) | 1979-1981 |
| Nissan Silvia (S110) | 1979-1981 |
| Nissan Pickup D21 | 1985-1988 |
| Nissan BlueBird (Y910 / YJ 910) | – |
| Nissan Skyline (UJR 30) | – |
| Datsun 720 | 1983-1986 |
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