the Nissan / Datsun L20B It is a 2.0-liter (1,952 cc, 119.11 cu in) carbureted 4-cylinder in-line 4-cycle gasoline engine from the Nissan L family. The Nissan / Datsun L20B engine was manufactured between 1974 and 1985.
The Nissan (Datsun) L20B engine features OHC valves, a wedge-shaped combustion chamber, an aluminum cylinder head, and a fully balanced five-bearing crankshaft. The cylinder block is cast as a single unit and features a deep skirt. The engine is equipped with a 2-cylinder single downdraft carburetor incorporating a special device to control emissions.
The L20B engine has a cylinder bore of 85.0 mm (3.35 in.) And a piston stroke of 86.0 mm (3.38 in.) With a compression ratio of 8.5: 1.
The Nissan L20B engine produced:
- Gross SAE: 112 PS (110 HP, 82 kW) and 152 Nm (15.5 kgm, 112 lbft)
- SAE Network: 98 PS (97 HP, 72 kW) & 138 Nm (14.1 kgm, 102 lbft)
The engine code breakdown is as follows:
- L – Engine family
- twenty – 2.0 liter displacement
|Design||Four stroke, Inline-4 (Straight-4)|
|Displacement||2.0 liters, 1,952 cm3 (119.11 cubic inch)|
|Max. horsepower||112 PS (110 PS, 82 kW)|
|Max. torque||52 Nm (15.5 kgm, 112 lbft)|
|Order to open fire||1-3-4-2|
|Dimensions (L x H x W):||–|
The Nissan-Datsun L20B engine has a cast iron cylinder block. The cylinder block, a special one-piece cast iron structure, employs a five-bearing support system. The cylinder bores are surrounded by cooling jackets and machined directly into the block. The oil passages in the block are arranged so that the full flow oil filter is connected directly to the right side of the block. The cylinder bore of the Nissan L20B engine is 85.0 mm (3.35 in) and the piston stroke is 86.0 mm (3.38 in), the compression ratio is 8.5: 1 .
The crankshaft is a special steel forging; Fully balanced, it results in smooth and reliable power at high speed. The engine uses eight counterweights. The pistons are made of special cast aluminum with struts to control thermal expansion and have two compression rings and a combined oil ring. The piston heads are slightly domed. The piston pin is a special hollow steel shaft. Fully fits the piston and snaps into the connecting rods. The connecting rods are made of special forged steel.
|Cylinder Block Alloy||Molten iron|
|Compression ratio:||8.5: 1|
|Cylinder bore:||85.0 mm (3.35 inches)|
|Piston stroke:||86.0 mm (3.38 inches)|
|Number of piston rings (compression / oil):||2/1|
|Number of main bearings:||5|
|Cylinder bore (standard):||85,000-85,050 mm (3.3465-3.3484 inches)|
|Piston Skirt Diameter (Standard):||84.985-85.035 mm (3.3459-3.3478 inches)|
|Piston Pin Outside Diameter:||20.993-20.998 mm (0.8265-0.8267 inches)|
|Piston ring side clearance:||Top||0.040-0.073 mm (0.0016-0.0029 inch)|
|Second||0.030-0.070 mm (0.0012-0.0028 inch)|
|Piston Ring End Gap:||Top||0.25-0.40 mm (0.0098-0.0157 inch)|
|Second||0.30-0.50 mm (0.0118-0.0197 inches)|
|Petroleum||0.30-0.90 mm (0.012-0.035 inch)|
|Connecting rod center distance:||146.00 mm (5.75 inches)|
|Crankshaft journal diameter:||59.942-59.955 mm (2.3599-2.3604 inches)|
|Crankpin diameter:||49.961-49.974 mm (1.9670-1.9675 inches)|
|Crankshaft Center Distance:||43.00 mm (1.6929 inches)|
The cylinder head is made of light and strong aluminum alloy with good cooling efficiency; contains wedge-type combustion chambers. A special aluminum bronze valve seat is used in the intake valve, while a heat resistant steel valve seat is installed in the exhaust valve. All of these parts are hot press fit.
The camshaft is made of special cast iron and is located inside the rocker cover. Four aluminum alloy brackets hold the camshaft. The camshaft bearings are lubricated with the oil holes that lead to the main oil gallery of the cylinder head. Concentric passages are drilled in the front and rear of the camshaft.
The valve system has a pivot-type rocker arm that is activated directly by the cam mechanism. The motor…