Prince G18

Prince G18 engineThe Prince G18 is a carbureted 1.8 liter (1,815 cc, 110.8 cu-in) straight-four, four-stroke cycle gasoline from Prince G-family produced since 1968 to 1975.

The Prince G18 engine is a short-stroke unit with a displacement of 1,815 cm3 (110.8 cu-in). The aluminum alloy cylinder head has cross-flow ports and a V-shaped valve layout. The Prince G18 engine was equipped with a dual barrel down draught type carburetor.

The Prince G18 has an 85.0 mm (3.346 in) cylinder bore and 80.0 mm (3.150 in) piston stroke with a compression ratio of 8.3:1. It produced 105 PS (104 HP, 77 kW) at 5,600 rpm of maximum horsepower and 156 Nm (15.0 kg⋅m, 115 lb⋅ft) at 3,600 rpm of torque.

The breakdown of the engine code is as follows:

  • G – Engine Family
  • 18 – 1.8 Liter Displacement

General information

Engine Specifications
Engine code L18
Layout Four stroke, Inline-4 (Straight-4)
Fuel type Gasoline
Production 1968-1975
Displacement 1.8 L; 1,815 cm3 (110.8 cu in)
Fuel system Carburetor
Power adder None
Max. horsepower 105 PS (104 HP, 77 kW) at 5,600 rpm
Max. torque 156 Nm (15.0 kg⋅m, 115 lb⋅ft) at 3,600 rpm
Firing order 1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The G-18 engine has a cast-iron cylinder block, bore is 85.0 mm (3.346 in) and stroke is 80.0 mm (3.150 in). The crankshaft is a carbon steel forging and is provided with five main bearings and four balancing weights Aluminium thrust bearings are located at the №2 journal.

The cast aluminum alloy pistons have two compression rings and one oil ring. Gudgeon pins are fully-floating in the piston bores and are equipped with circlips at each end to limit the amount of their travel. The forged steel connecting rods have weight adjusting bosses at both large and small ends to ensure that the rods are correctly balanced during operation.

Cylinder block
Cylinder block alloy Cast iron
Compression ratio: 8.3:1
Cylinder bore: 85.0 mm (3.346 in)
Piston stroke: 80.0 mm (3.150 in)
Number of piston rings (compression / oil): 2 / 1
Number of main bearings: 5
Cylinder inner diameter (standard): 85.0 mm (3.346 in)
Piston skirt diameter (standard): 84.968-85.000 mm (3.345-3.346 in)
Piston pin outer diameter: 21.991-22.000 mm (0.8658-0.8661 in)
Piston ring side clearance: Top 0.040-0.080 mm (0.0016-0.0031 in)
Second 0.020-0.060 mm (0.0008-0.0024 in)
Oil 0.020-0.060 mm (0.0008-0.0024 in)
Piston ring end gap: Top 0.35-0.55 mm (0.0138-0.0217 in)
Second 0.30-0.50 mm (0.0118-0.0197 in)
Oil 0.35-0.55 mm (0.0138-0.0217 in)
Connecting rod center distance: 140.0 mm (5.51 in)
Crankshaft journal diameter: 55.990 mm (2.2043 in)
Crankpin diameter: 49.991 mm (1.968 in)
Crankshaft center distance: 40.0 mm (1.5748 in)

Cylinder head

The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. The camshaft is made of specially cast iron and is located inside the rocker cover. The single overhead camshaft is driven from the crankshaft by a double row roller chain at a
reduction ratio of 2:1. Intake valves are 42.00 mm (1.65 in) in diameter and the exhaust valves are 35.00 mm (1.38 in), valve lift is 9.00 mm (0.345 in) for both sides.

A Stromberg type D3034C carburetor is installed on engines with exhaust emission control and a Solex type DAK340 carburetor on engines not equipped with this type of system.

Cylinder head
Valve Arrangement: OHV, chain drive
Valves: 8 (2 valves per cylinder)
Intake/Exhaust duration:
Valve head diameter: INTAKE 42.0 mm (1.654 in)
EXHAUST 35.0 mm (1.378 in)
Valve guide length: INTAKE 48.0 mm (1.890 in)
EXHAUST 60.0 mm (2.362 in)
Valve stem diameter: INTAKE 8.00 mm (0.31 in)
EXHAUST 8.00 mm (0.31 in)
Valve lift: INTAKE 9.0 mm (0.354 in)
EXHAUST 9.0 mm (0.354 in)
Outer camshaft journal diameter: 37.45-37.475 mm (1.474-1.475 in)

Maintenance data

Valve clearance (HOT)
Intake valve 0.28 mm (0.011 in)
Exhaust valve 0.28 mm (0.011 in)
Valve clearance (COLD)
Intake valve 0.25 mm (0.009 in)
Exhaust valve 0.25 mm (0.009 in)
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) 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 (lb/sq.in.) 4.7-5.5 (66.8-78.2)
Ignition system
Spark plug BP-6E (NGK)
Spark plug gap 0.8-0.9 mm (0.03 -0.035 in)

Vehicle applications

Model Years Produced
Nissan Skyline 1800 (PC10) 1968-1972
Nissan Laurel C30 1968-1972
Datsun 1800 (C30) 1968-1972
Nissan Skyline 1800 (PC110) 1972-1975
Nissan Laurel C130 1972-1975
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

Be the first to comment

Leave a Reply

Your email address will not be published.


*