Nissan L16T

Nissan L16T Twin carb engineThe Nissan / Datsun L16T is a carbureted 1.6 liter (1,595 cc, 93.77 cu in) straight-4, four-stroke cycle gasoline engine from Nissan L-family. The L16T engine was basically the same as the L16 but had twin SU carburetor.

The Nissan-Datsun L16T engine feature OHC valves, wedge-shaped combustion chamber, aluminum cylinder head and fully balanced five-bearing crankshaft to turn out smooth, dependable power. The cylinder block is cast in a single unit, featuring deep skirting. To provide air-fuel mixing the L16T used SU type carburetor.

The L16T engine has an 83.0 mm (3.27 in) cylinder bore and 73.7 mm (2.90 in) piston stroke with a compression ratio of 9.5:1.

The Nissan L16T engine produced:

  • Reguler gasoline specs: 100 PS (98 HP, 73 kW) at 6,400 rpm and 132 Nm (13.5 kg·m, 87.3 lb·ft) at 4,000 rpm
  • High-octane gasoline specs: 105 PS (103 HP, 77 kW) at 6,400 rpm and 135 Nm (13.8 kg·m, 99.5 lb·ft) at 4,000 rpm

The breakdown of the engine code is as follows:

  • L – Engine Family
  • 16 – 1.6 Liter Displacement
  • T – Twin carburetor

General information

Engine Specifications
Engine code L16T
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline
Displacement 1.6 L, 1,595 cm3 (93.77 cu in)
Fuel system Twin SU carb
Power adder None
Max. horsepower 100 PS (98 HP, 73 kW) at 6,400 rpm
105 PS (103 HP, 77 kW) at 6,400 rpm
Max. torque 132 Nm (13.5 kg·m, 87.3 lb·ft) at 4,000 rpm
135 Nm (13.8 kg·m, 99.5 lb·ft) at 4,000 rpm
Firing order 1-3-4-2
Dimensions (L x H x W):

Cylinder block

The Nissan L16T motor has a cast-iron cylinder block. The cylinder block, which is of a monoblock special casting structure, adopts the five-bearing-support system. The cylinder bores are surrounded by cooling jackets and machined directly in the block. The oilways in the block are arranged so that the full-flow oil filter is directly attached to the right-hand side of the block. The L16T engine equipped with twin carburetors use the flat head pistons. The Nissan L16T engine cylinder bore is 83 mm (3.27 in) and the piston stroke is 73.7 mm (2.90 in), compression ratio rating is 9.5:1.

The crankshaft is a special steel forging. Fully balanced, it turns out smooth, dependable power at high speed. Main bearings gain lubrication from oil pumped through the main oil gallery and the oil holes which run in parallel with cylinder bores.

The pistons are special aluminum casting with struts to control thermal expansion and have two compression rings and one combined oil ring. The piston pin is a special hollow steel shaft. It is full-floating fit to the piston and press-fit to the connecting rods. The connecting rods are special forged steel.

Cylinder block
Cylinder block alloy Cast iron
Compression ratio: 9.5:1
Cylinder bore: 83 mm (3.27 in)
Piston stroke: 73.7 mm (2.90 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 5
Cylinder inner diameter (standard): 83.000 mm (3.2677 in)
Piston skirt diameter (standard): 82.985-83.035 mm (3.2671-3.2691 in)
Piston pin outer diameter: 20.995-21.000 mm (0.8266-0.8268 in)
Piston ring side clearance: Top 0.040-0.080 mm (0.0016-0.0031 in)
Second 0.030-0.070 mm (0.0012-0.0028 in)
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)
Connecting rod center distance: 133.0 mm (5.24 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: 36.850 mm (1.4507 in)

Cylinder head

The cylinder head is made of light and strong aluminum alloy with good cooling efficiency; it contains wedge-type combustion chambers. A special aluminum bronze valve seat is used on the intake valve, while a heat resistant steel valve seat is installed on the exhaust valve. These parts are all hot press-fitted.

The camshaft is made of special cast iron and located inside rocker cover. Four aluminum alloy brackets support camshaft. Camshaft bearings are lubricated from oil holes which lead to the main oil gallery of the cylinder head. The valve system has a pivot type rocker arm that is activated directly by the cam mechanism. The Nissan L16 motor use the dual-type valve springs.

The valves head diameter is the same as the L16 engine, but the duration and valve lift are different. The intake valves are 42.0 mm (1.65 in) in diameter and the exhaust valves are 33.0 mm (1.30 in). The intake valve duration is 248°, valve lift is 10.5 mm (0.41 in); the exhaust valve duration is 248°, valve lift is 10.5 mm (0.41 in).

The camshaft is driven by a double row roller chain driven by the crankshaft. The tension of the chain is controlled by a chain tensioner which is operated by spring and oil pressure.

The intake manifold is made of casted aluminum alloy. The twin-carburetor type L16 engines use the one with an independent design for each carburetor.

Cylinder head
Valve Arrangement: OHV, chain drive
Valves: 8 (2 valves per cylinder)
Intake/Exhaust duration: 248°/248°
Valve head diameter: INTAKE 42.0 mm (1.6535 in)
EXHAUST 33.0 mm (1.2992 in)
Valve length: INTAKE 114.9-115.2 mm (4.524-4.535 in)
EXHAUST 115.7-116.0 mm (4.555-4.567 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)
Valve spring free length: INTAKE Outer: 49.98 mm (1.968 in)
Inner: 44.85 mm (1.766 in)
EXHAUST Outer: 49.98 mm (1.968 in)
Inner: 44.85 mm (1.766 in)
Camshaft robe lift: INTAKE 7.00 mm (0.2753 in)
EXHAUST 7.00 mm (0.2753 in)
Rocker arm lever ratio: 1.45
Outer camshaft journal diameter: 47.949-47.962 mm (1.8878-1.8883 in)

Tightening torque specs

Tightening torque specs
Cylinder head bolt Step 1: 40 Nm; 4.0 kg·m; 28.9 ft·lb
Step 2: 60 Nm; 6.0 kg·m; 43.4 ft·lb
Step 3: 60-85 Nm; 6.5-8.5 kg·m; 47.0-61.5 ft·lb
Connecting rod big end nuts 31-37 Nm; 3.2-3.8 kg·m; 23-27 ft·lb
Flywheel bolt 137-157 Nm; 14.0-16.0 kg·m; 101-116 ft·lb
Main bearing cap bolt 31-37 Nm; 3.2-3.8 kg·m; 23-27 ft·lb
Camshaft sprocket bolt 118-157 Nm; 12.0-16.0 kg·m; 87-116 ft·lb
Oil pan bolts 6-9 Nm; 0.6-0.0 kg·m; 4.3-6.5 ft·lb
Oil pump bolt 11-15 Nm; 1.1-1.5 kg·m; 8-11 ft·lb
Oil pan drain plug 20-30 Nm; 2.0-3.0 kg·m; 14-22 ft·lb
Pocker pivot lock nut 49-59 Nm; 5.0-6.0 kg·m; 36-44 ft·lb
Camshaft locating plate bolts 6-9 Nm; 0.6-0.0 kg·m; 4.3-6.5 ft·lb
Manifold nuts 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb
Fuel pump nuts 12-18 Nm; 1.2-1.8 kg·m; 8.7-13.0 ft·lb
Crank pulley nut 118-157 Nm; 12.0-16.0 kg·m; 87-116 ft·lb

Maintenance data

Valve clearance (HOT)
Intake valve 0.25 mm (0.010 in)
Intake valve 0.30 mm (0.012 in)
Valve clearance (COLD)
Intake valve 0.20 mm (0.008 in)
Exhaust valve 0.25 mm (0.010 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
Oil type API SE
Engine oil capacity (Refill capacity) Hight level: 4.3 l
Low level: 3.3 l
Oil change interval, km (miles) 5,000-10,000 (3,000-6,000)
Oil pressure, kg/cm2 (psi) 3.5-4.2 (49.8-56.9) at 2,000 rpm
Ignition system
Spark plug BP6ES (NGK)
Spark plug gap 0.8-0.9 mm (0.03-0.035 in)
Spark plug tightening torque 15-25 Nm; 1.5-2.5 kg·m; 11-15 ft·lb
Carburetor model HJL38W6
Bore 38 mm (1.4961 in)
Piston lift 29 mm (1.1417 in)
Jet needle M-76
Nozzle jet diameter 2.34 mm (0.0921)
Suction spring #23
Float level 23 mm (0.9055 in)
Float venting Inner vent type
Fuel pressure 0.24 kg·cm3 (3.41 lb·sq in)
Throttle clearance at full throttle 0.6 mm (0.0236 in)
Position at full throttle 6.5°

Vehicle applications

Model Years Produced
Nissan Bluebird (510) 1968-1972
Datsun 160Z (B210)
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