Honda J30A5 Specifications
| Engine Model: Honda J30A5 |
| Engine Type: 4-cycle 6-cylinder SOHC 24-valve i-VTEC liquid-cooled gasoline |
| Total Displacement: 182.9 cu.in (2.99 L) |
| Rated Engine Power: 240-244 Hp (179-182 kW) at 6200 rpm |
| Fuel System Type: Sequential multi-point fuel injection (PGM-FI) |
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The Honda J30A5 is a 3.0-liter V6 gasoline
engine belonging to Honda’s widely used J-series engine family. Produced
during the mid-2000s for models such as the Honda Accord and Acura TSX
(regional variants), the J30A5 was designed to deliver smooth and
efficient performance with an emphasis on reliability, refinement, and
low running costs. As an evolution of earlier J30 engines, the J30A5
incorporates multiple improvements in airflow, combustion chamber
efficiency, emissions control, and electronic management.
The engine provides strong mid-range torque, quiet operation, and
excellent long-term durability—qualities that make it well-suited for
midsize sedans and light crossovers. Although not a high-performance
engine like the J32A2 or J35Z3, the J30A5 offers balanced output, smooth
power delivery, and low fuel consumption. Honda’s engineering focus for
this engine centered on durability, smooth V6 operation, and compliant
emissions without compromising everyday drivability.
The Honda J30A5 is a four-stroke, liquid-cooled, 60-degree V6 gasoline
engine with a displacement of 2,997 cc (182.9 cubic inches). Bore is
86.0 mm (3.39 inches), and stroke is 86.0 mm (3.39 inches), creating a
square geometry favorable for balanced power and torque characteristics.
The compression ratio is approximately 10.0:1.
Factory-rated power output typically ranges from 240 to 244 horsepower
(179–182 kW) at approximately 6,200 rpm. Peak torque output is
approximately 287 to 290 Nm (212–214 lb-ft) at around 5,000 rpm. Idle
speed is calibrated at 680 ± 50 rpm. The rev limiter is ordinarily set
around 6,700 rpm. Firing order is 1-4-2-5-3-6.
The engine uses an aluminum block and aluminum cylinder heads to reduce
weight and improve heat dissipation. The rotating assembly includes a
forged steel crankshaft supported by four main bearings, forged steel
connecting rods, and lightweight aluminum pistons with molybdenum-coated
skirts. The pistons have reinforced ring lands and optimized crown
profiles for efficient combustion.
The J30A5 uses an aluminum open-deck block with cast-iron cylinder
liners. The 60-degree V-angle ensures compact size and excellent
inherent balance. The block incorporates deep skirt architecture for
enhanced structural rigidity and reduction of vibration under load.
A main bearing girdle secures all lower-end bearings, improving
crankshaft stability and reducing torsional stress. Oil passages are
cast into the block to ensure consistent lubrication of the main
journals, connecting rods, and valvetrain components. Coolant passages
are arranged to maintain even temperature distribution throughout both
cylinder banks.
The engine features aluminum SOHC cylinder heads with four valves per
cylinder. Honda’s i-VTEC system is installed on the intake camshaft,
combining variable cam phasing with variable lift and duration. This
enables improved low-rpm torque and enhanced high-rpm airflow.
Valve sizes are approximately:
– Intake valves: 35 mm (1.38 in)
– Exhaust valves: 30 mm (1.18 in)
Roller rocker arms reduce friction and improve efficiency. The camshafts
are driven by a silent-type timing chain with a hydraulic tensioner. The
compact combustion chamber design enhances mixture swirl, reducing
emissions and improving part-load efficiency.
The J30A5 employs Honda’s PGM-FI (Programmed Fuel Injection) sequential
multi-point fuel system. Fuel pressure is typically around 350–400 kPa
(51–58 psi), regulated within the fuel tank.
Fuel system components include:
– In-tank electric fuel pump
– High-precision multi-hole injectors
– Fine paper-element fuel filter (integrated into fuel pump module)
– MAP sensor
– IAT sensor
– ECT sensor
– Upstream wideband oxygen sensor
– Downstream oxygen sensor
– Knock sensor
– Throttle position sensor within drive-by-wire throttle body
The returnless design minimizes evaporative emissions and maintains
stable pressure under dynamic load conditions. Recommended fuel is
unleaded gasoline of at least 87 AKI (91 RON), though higher octane may
provide improved knock tolerance.
The lubrication system is a full-pressure wet-sump configuration. A
crankshaft-driven trochoid oil pump circulates engine oil through a
pickup screen and delivers it to a full-flow spin-on filter before
reaching the primary oil galleries.
Oil specifications:
– Oil capacity with filter: approx. 4.5 liters (4.8 US quarts)
– Oil pressure at 3,000 rpm: approx. 350–500 kPa (51–72 psi)
– Idle oil pressure: approx. 70–120 kPa (10–17 psi)
The pistons are cooled using oil jets directed at their undersides.
Recommended viscosity is SAE 5W-20 or 0W-20 depending on climate. Oil
and filter should be replaced every 10,000 km (6,000 miles) for normal
service or more frequently under severe conditions.
The J30A5 cooling system is a forced-circulation liquid system using a
belt-driven centrifugal water pump. Coolant is routed through the block,
heads, heater core, and radiator.
Cooling specifications:
– Coolant capacity: approx. 7.0–7.5 liters (7.4–7.9 US quarts)
– Thermostat opening: approx. 78–82°C (172–180°F)
– Fully open: approx. 95°C (203°F)
– System pressure: approx. 90–110 kPa (13–16 psi)
Electric radiator fans provide additional cooling under heavy load or
high ambient temperature. Honda recommends a 50/50 ethylene glycol
mixture with distilled water, replaced every 40,000 km (25,000 miles) or
two years.
| Intake and Exhaust Systems |
The intake system includes a composite intake manifold tuned for
mid-range torque. The throttle body is electronically controlled
(drive-by-wire). The engine uses a dry-element air filter that should be
replaced every 20,000–30,000 km.
The exhaust system uses:
– Cast or stainless exhaust manifolds
– Close-coupled catalytic converter
– Downstream catalytic converter (vehicle dependent)
– Primary and secondary O2 sensors
The system minimizes restriction while maintaining emissions compliance
and reducing noise.
| Ignition and Electrical System |
Ignition is controlled via a coil-on-plug system. Iridium-tipped spark
plugs ensure reliable ignition and long service life. Spark plug gap is
approximately 1.0–1.1 mm (0.039–0.043 in).
Electrical specifications:
– Alternator output: approx. 110–130 amperes
– Starter motor: approx. 1.6–2.0 kW
– System voltage: 12 V
The ECU manages ignition timing, fuel metering, VTEC control, throttle
position, knock response, and emissions systems.
The J30A5 includes:
– PCV system for crankcase ventilation
– EVAP emissions system with charcoal canister
– EGR (exhaust gas recirculation) for emissions reduction
– OBD-II diagnostics
– VTC and i-VTEC oil control solenoids
– Electronic idle-air control through throttle body
– Length: 670 mm (26.4 inches)
– Width: 690 mm (27.2 inches)
– Height: 720 mm (28.3 inches)
Dry weight is typically 160–175 kg (353–386 lbs) depending on accessory
configuration.
Routine maintenance schedule:
– Oil and filter: every 10,000 km (6,000 miles)
– Air filter: every 20,000–30,000 km
– Spark plugs: every 100,000 km (62,000 miles)
– Coolant: every 40,000 km (25,000 miles) or 2 years
– Drive belt: inspect every 30,000 km
– Valve clearance: inspect every 120,000 km
– Compression test: 180–210 psi (1,240–1,450 kPa)
– Cylinder head bolts: 30 Nm (22 lb-ft) + 90° + 90°
– Main bearing caps: 60 Nm (44 lb-ft)
– Connecting rod bolts: 40 Nm (30 lb-ft) + 90°
– Flywheel bolts: 88 Nm (65 lb-ft)
– Crankshaft pulley bolt: 235–245 Nm (173–181 lb-ft)
– Intake manifold bolts: 22 Nm (16 lb-ft)
– Exhaust manifold nuts: 30 Nm (22 lb-ft)
– Spark plugs: 18 Nm (13 lb-ft)
– Oil drain plug: 40 Nm (30 lb-ft)
The Honda J30A5 was primarily used in:
– Honda Accord (mid-2000s, V6 models)
– Acura TSX and other regional variants
– Aftermarket swaps requiring a lightweight, efficient V6
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