The Nissan NA20S is a carbureted 2.0 liter (1,998 cc, 121.9 cu·in) straight-four, four-stroke cycle gasoline from Nissan NA-family. The Z20 engine was manufacturing from 1989 through 1999. It replaced the Nissan Z series engines.
The Nissan NA20S engine features an aluminum block and aluminum alloy cylinder head with two valves per cylinder with a single overhead camshaft. An 86.0 mm (3.39 in) cylinder bore and 86.0 mm (3.39 in) piston stroke give the NA20S engine a total of 1,998 cc of displacement. Compression ratio rating is 8.7:1.
The Nissan NA20S engine produced 100 PS (74 kW; 99 HP) at 5,000 rpm of maximum horsepower and 167 N·m (17 kg·m, 123.1 ft·lb) at 3,000 rpm of peak torque.
The breakdown of the engine code is as follows:
- NA – Engine Family
- 20 – 2.0 Liter Displacement
- S – carburetor
General information
| Engine Specifications | |
| Engine code | NA20S |
| Layout | Four stroke, Inline-4 (Straight-4) |
| Fuel type | Gasoline |
| Production | 1989-1999 |
| Displacement | 2.0 L, 1,998 cc (121.9 cu in) |
| Fuel system | Carburetor |
| Power adder | None |
| Max. horsepower | 100 PS (74 kW; 99 HP) at 5,000 rpm |
| Max. torque | 167 N·m (17 kg·m, 123.1 ft·lb) at 3,000 rpm |
| Firing order | 1-3-4-2 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
The NA20S engine has an aluminum cylinder block, bore is 86.0 mm (3.39 in) and stroke is 86.0 mm (3.39 in). Compression ratio rating is 8.7:1. 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 | Aluminum | |
| Compression ratio: | 8.7:1 | |
| Cylinder bore: | 86.0 mm (3.39 in) | |
| Piston stroke: | 86.0 mm (3.39 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 5 | |
| Cylinder inner diameter (standard): | 86.000-86.010 mm (3.3858-3.3862 in) | |
| Piston skirt diameter (standard): | 85.965-85.975 mm (3.3844-3.3848 in) | |
| Piston pin outer diameter: | 20.993-20.998 mm (0.8265-0.8267 in) | |
| Connecting rod big end diameter (standard): | 53.000-53.013 mm (2.0866-2.0871 in) | |
| Connecting rod center distance: | 147.95-148.05 mm (5.8248-5.8287 in) | |
| Piston ring side clearance: | Top | 0.040-0.075 mm (0.0016-0.003 in) |
| Second | 0.030-0.063 mm (0.0012-0.0025 in) | |
| Oil | – | |
| Piston ring end gap: | Top | 0.240-0.430 mm (0.0094-0.0169 in) |
| Second | 0.420-0.660 mm (0.0165-0.026 in) | |
| Oil | 0.200-0.690 mm (0.0079-0.0272 in) | |
| Crankshaft journal diameter: | 54.942-54.955 mm (2.1631-2.1636 in) | |
| Crankpin diameter: | 49.961-49.974 mm (1.967-1.9675 in) | |
| Crankshaft center distance: | 43.0 mm (1.695 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 | ||
| Cylinder head alloy | Aluminum | |
| Valve Arrangement: | SOHC, chain drive | |
| Valves: | 8 (2 valves per cylinder) | |
| Head height: | 98.8-99.0 mm (3.8898-3.8976 in) | |
| Intake/Exhaust duration: |
Without hydraulic lifters: 232°/240° With hydraulic lifters: 240°/248° |
|
| Valve head diameter: | INTAKE | 38.0-38.2 mm (1.4961-1.5039 in) |
| EXHAUST | 34.0-34.2 mm (1.3386-1.3465 in) | |
| Valve length: | INTAKE | 121.72-122.32 mm (4.7921-4.8157 in) |
| EXHAUST | 123.30-123.80 mm (4.8543-4.874 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 |
With hydraulic lifters: 44.310-44.500 mm (1.7445-1.752 in) Without hydraulic lifters:44.572-44.762 mm (1.7548-1.7623 in) |
| Outer camshaft journal diameter: | 32.935-32.955 mm (1.2967-1.2974 in) | |
Maintenance data
| Valve clearance (HOT) | |
| Intake valve | 0.30 mm (0.012 in) |
| Exhaust valve | 0.30 mm (0.012 in) |
| Valve clearance (COLD) | |
| Intake valve | 0.21 mm (0.0083 in) |
| Exhaust valve | 0.23 mm (0.0091 in) |
| Compression pressure | |
| Standard | 12.0 kg/cm2 (11.77 bar, 171 psi) / 350 rpm |
| Minimun | 10.0 kg/cm2 (9.91 bar, 144 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 | SAE 10W-30,5W-30 |
| Oil type API | SE, SF or SG |
| Engine oil capacity (Refill capacity) |
With filter change 3.8 l Without filter change 3.5 l |
| Oil change interval, km (miles) | 5,000-10,000 (3,000-6,000) |
| Ignition system | |
| Spark plug | NGK: BPR5ES |
| Spark plug gap | 0.8-0.9 mm (0.03 -0.035 in) |
| Spark plug tightening torque | 25 N·m (2.5 kg·m, 18.4 ft·lb) |
Vehicle applications
| Model | Years Produced |
| Datsun Truck D21 | 1989-1999 |
| Nissan Atlas (F22, F23) | 1990–1999 |
| Nissan Atlas H40 | 1990–1999 |
| Nissan Homy | 1990–1999 |
| Nissan Caravan E24 | 1990–1999 |
Author:
Hello
I need Niaasn Na20 pistons
Seize 20/40
Please send me the Torque settings for big ends and mains of Nissan Na 20 s
I need a NA20S Nissan-Datsun carburettor urgently
hi i have na20s in a 1990 d21 what is the correct ignition timing btdc
regards colin
This site was very helpful thx.
Hi i need na20 Nissan 1 tonner carburettor please
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My pick up engine power has gone down. It can not drive on ahilly place. It is NA engine. Sahara petrol engine. Assist
I need timing marks and touqe settings for the head na 20 nissan atlas
I need torque specifications for nissan NA20 NISSAN ATLAS.CYLINNDER HEAD.MAIN BEARING. CONROD BEARING
My NA20 is consuming a lot of fuel (13l/100km). What could be the problem? It has a carburetor
I think you need to change the following, spark plugs , air filter and clean your distributor cap you may use a water paper to clean all the whitish accumulated in the carbon nodes in the cap . Your car performance will definitely change for the better ever , try this , thànk you
I need torque specifications for nissan NA20 NISSAN.CYLINNDER HEAD.
What would cause the distrubor cap lead to blow off then after replacing it back on it doesn’t work..
correct btdc is 10%