Nissan GA15DS Specifications
| Engine Model: Nissan GA15DS |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 91.4 cu.in (1.49 L) |
| Rated Engine Power: 89-97 Hp (66-72 kW) at 6000 rpm |
| Fuel System Type: Single or two barrel downdraft carburetor |
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The Nissan GA15DS is a 1.5-liter inline-four,
four-stroke gasoline engine belonging to Nissan’s GA-series family,
which includes the GA13, GA14, GA15, and GA16 engine groups. The GA15DS
is a DOHC carbureted version of the GA15, representing a transitional
design in Nissan’s small-displacement engine evolution. It was produced
during the late 1980s and early to mid-1990s for global compact
passenger cars such as the Nissan Sunny, Sentra, Pulsar, and other
regional models.
Prior to the adoption of full electronic fuel
injection in all markets, the GA15DS provided a balance of modern DOHC
architecture with traditional carburetion, offering improved power and
efficiency compared with earlier E-series carbureted engines.
Although the GA15DS does not use multi-point fuel injection like the
GA15DE, it retains many of the GA-series advantages: a robust bottom-end
design, aluminum DOHC cylinder head, chain-driven camshafts, and
efficient combustion chamber geometry. These features allow the GA15DS
to deliver smooth operation, moderate fuel economy, and dependable
performance in markets where carburetors remained preferred for reasons
of cost and serviceability. The GA15DS remains appreciated for its
mechanical simplicity paired with improved breathing and higher
efficiency relative to older carbureted engines.
The GA15DS is a water-cooled, inline-four gasoline engine with a total
displacement of 1497 cc, or approximately 91.4 cubic inches. Cylinder
bore measures 73.6 mm (2.90 inches), and stroke is 88.0 mm (3.46
inches), resulting in a long-stroke configuration designed to enhance
low- and mid-range torque. This geometry makes the engine responsive in
city and suburban driving, where quick low-rpm acceleration is more
important than high-rpm performance.
Compression ratio typically ranges between 9.5:1 and 9.9:1 depending on
market specifications and emissions calibrations. Maximum power output
is generally between 89 and 97 horsepower (66 to 72 kW) at approximately
6000 rpm. Maximum torque output falls between 125 and 130 Nm (92 to 96
lb-ft) at about 4000 rpm. The idle speed is set at approximately 750 ±
50 rpm. The firing order is 1-3-4-2.
The bottom end consists of a fully counterweighted forged-steel
crankshaft supported by five main bearings. This ensures stable high-rpm
operation and long service life. Connecting rods are forged steel with
full-floating wrist pins. Pistons are aluminum alloy with
molybdenum-coated skirts, helping reduce friction and improving
cold-start behavior. Piston ring configuration includes two compression
rings and one oil-control ring.
The GA15DS employs an aluminum alloy DOHC cylinder head with dual
overhead camshafts operating four valves per cylinder, for a total of
sixteen valves. This modern multi-valve architecture enhances airflow
and combustion efficiency compared with earlier SOHC or OHV carbureted
engines. The combustion chambers are pent-roof shaped, providing
efficient flame propagation and improved thermal efficiency.
Camshafts are driven by a roller-type timing chain, engineered for long
life. Chain tension is maintained automatically by a hydraulically
actuated tensioner fed by engine oil pressure. This arrangement
eliminates timing belt service intervals and improves reliability for
high-mileage engines. Valve actuation is via shim-over-bucket tappets,
which require periodic inspection but retain adjustment for long periods
due to low wear rates. Valve clearances when cold fall between 0.22 mm
(0.009 inches) intake and 0.28 mm (0.011 inches) exhaust.
The GA15DS uses a downdraft carburetor rather than fuel injection.
Depending on market and emissions
requirements, it may be equipped with:
- Conventional mechanical carburetor
- Vacuum-controlled secondary throttle
- Automatic choke or manual choke
- Feedback-carburetor version with an oxygen sensor and
solenoid-controlled air-bleed circuit
The carburetor is mounted on an aluminum intake manifold with long
runners optimized for mid-range torque. A mechanical fuel pump driven by
the camshaft provides fuel at low pressure, typically between 20 and 30
kPa (3 to 4 psi). Fuel is filtered through an inline paper element fuel
filter. Emissions-controlled variants include vacuum-modulated circuits
for regulating idle mixture, deceleration, and part-throttle operation.
The ignition timing advance curve is tuned to complement carbureted
fueling, providing smooth throttle response. Fuel economy varies
depending on vehicle weight and driving conditions but generally falls
between 6.5 and 7.5 liters per 100 km (31 to 36 mpg).
The lubrication system is a pressurized wet-sump type. A trochoid oil
pump mounted at the front of the block and driven by the crankshaft
supplies oil to the full-flow spin-on filter, crankshaft bearings,
connecting rod bearings, camshaft journals, and valvetrain components.
Oil also lubricates the timing chain and hydraulic tensioner.
Oil capacity with filter is approximately 3.1 to 3.3 liters (3.3 to 3.5
US quarts). Recommended oil viscosity is SAE 5W-30 or 10W-30 under most
conditions. Oil pressure at 3000 rpm typically ranges between 350 and
450 kPa (50 to 65 psi), while idle pressure remains above 70 kPa (10
psi). Oil change intervals range from 5000 to 10,000 km depending on
driving conditions.
Cooling is provided by a liquid-cooled forced-circulation system using a
belt-driven centrifugal water pump. Coolant flows through the cast-iron
block, aluminum cylinder head, radiator, and heater core. The thermostat
begins opening at approximately 82°C (180°F) and reaches full opening
near 95°C (203°F). Cooling system capacity is approximately 5.0 liters
(5.3 US quarts). Radiator fans are electrically controlled through a
thermal switch or ECU-based trigger depending on vehicle model.
| Intake and Exhaust Systems |
The induction system consists of a molded plastic air intake duct,
resonator chambers to reduce intake noise, a dry-paper air filter, and
an aluminum intake manifold. Carbureted intake designs differ slightly
from fuel-injected ones, but both prioritize even airflow distribution
to all cylinders.
The exhaust manifold is cast iron and routes exhaust gas to a catalytic
converter in emissions-controlled markets. Carbureted versions use an
oxygen sensor only in feedback-carbureted variants. Non-feedback
versions rely on mechanical tuning, vacuum circuits, and proper jetting
to meet emissions requirements.
| Ignition and Electrical System |
Ignition is controlled through a traditional distributor system. The
distributor contains mechanical and vacuum advance mechanisms in early
variants and electronic advance control in later ones. The ignition coil
is external, delivering high voltage to the distributor cap, rotor, and
spark plug wires. Spark plugs are typically NGK BPR5ES or equivalent,
gapped to 1.0 millimeter (0.039 inches).
Electrical system voltage is 12 V DC, with alternator output typically
between 55 and 70 amperes. The starter motor is a reduction-gear type,
providing reliable cranking under varied weather conditions.
Depending on market, the GA15DS may
include:
- PCV (positive crankcase ventilation)
- EVAP (evaporative emissions control) carbon canister
- EGR (exhaust gas recirculation) system
- Air-injection (smog pump) on early vehicles
- Feedback-carburetion with ECU-controlled mixture solenoid
These systems vary widely depending on emissions regulations.
Length: 580 mm (22.8 in)
Width: 520 mm (20.5 in)
Height: 640 mm (25.2 in)
Dry weight: 105–115 kg (231–254 lbs) depending on carburetor and
accessory configuration.
Routine service procedures include:
- Oil and filter change every 5000–10,000 km
- Spark plug replacement every 20,000–30,000 km
- Air filter every 20,000 km
- Fuel filter every 20,000–30,000 km
- Valve clearance inspection every 40,000–60,000 km
- Coolant replacement every 40,000 km or 2 years
- Timing chain inspection at high mileage
- Compression pressure: 1300–1500 kPa (189–218 psi), variation max 100
kPa (15 psi)
- Cylinder head bolts: 98 Nm (72 lb-ft)
- Main bearing caps: 50 Nm (37 lb-ft)
- Connecting rod bolts: 30 Nm (22 lb-ft) + 60°
- Camshaft bearing cap bolts: 9 Nm (7 lb-ft)
- Flywheel bolts: 88 Nm (65 lb-ft)
- Crankshaft pulley bolt: 120 Nm (89 lb-ft)
- Intake manifold bolts: 22 Nm (16 lb-ft)
- Exhaust manifold nuts: 28 Nm (21 lb-ft)
- Spark plugs: 18 Nm (13 lb-ft)
- Oil drain plug: 34 Nm (25 lb-ft)
The GA15DS powered several compact Nissan
vehicles, including:
- Nissan Sunny (B12/B13 regional variants)
- Nissan Sentra carbureted versions (selected markets)
- Nissan Pulsar carbureted versions
- Nissan Lucino regional trims
- Regional taxis and fleet vehicles
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