Honda F22A6 Specifications
| Engine Model: Honda F22A6 |
| Engine Type: 4-cycle inline 4-cylinder SOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 131.6 cu.in (2.15 L) |
| Rated Engine Power: 140 Hp (104 kW) at 5600 rpm |
| Fuel System Type: Multi-point electronic fuel injection (PGM-FI) |
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The Honda F22A6 is a 2.2-liter inline-four
gasoline engine developed as part of Honda’s F-series architecture and
used primarily in the North American-market Honda Accord EX from 1991 to
1993. As a naturally aspirated SOHC engine, the F22A6 was engineered to
strike a balance between smooth daily drivability, moderate performance,
and long-term reliability.
Positioned above the base F22A1 and below the performance-oriented DOHC
F22B series, the F22A6 served as an upper-tier offering within the
Accord range.
Its design philosophy emphasizes durability, fuel efficiency, and
comfortable everyday operation. Honda’s engineering approach focused on
optimizing mid-range torque and throttle response while preserving low
maintenance costs and serviceability.
The F22A6 integrates a tuned intake manifold, revised camshaft profile,
and slightly freer-flowing exhaust compared to the F22A1, giving it a
slight performance edge while maintaining refined behavior. Owners often
praise the F22A6 for its stable idle, predictable low-rpm torque, quiet
operation, and longevity - even under less-than-ideal maintenance
conditions.
The F22A6 is well known for its ability to accumulate high mileage
without internal repairs. Its cast-iron block, aluminum SOHC head,
non-interference valvetrain, and overall mechanical simplicity make it
one of Honda’s most durable early-1990s powerplants. Although not a
performance engine in the modern sense, the F22A6 excels in consistency,
dependability, and real-world usability, which helped solidify the 1990s
Accord as one of the most reliable sedans of its era.
The Honda F22A6 is a four-stroke, inline-four gasoline engine with a
total displacement of 2,156 cc (131.6 cubic inches). Bore is 85.0 mm
(3.35 inches) and stroke is 95.0 mm (3.74 inches), forming a distinctly
long-stroke geometry optimized for low-to-mid-range torque. The engine’s
compression ratio is approximately 8.8:1 to 9.0:1 depending on model
year and market calibration.
Factory-rated output:
- Power: approx. 140 Hp (104 kW) at 5,600 rpm
- Torque: approx. 192 Nm (142 lb-ft) at 4,500 rpm
- Idle speed: approx. 700-750 rpm
- Rev limiter: approx. 6,500 rpm
The F22A6 uses multi-point PGM-FI fuel injection, a distributor-based
ignition system, and a belt-driven single overhead camshaft operating
four valves per cylinder. It features a cast-iron engine block paired
with an aluminum cylinder head, a forged steel crankshaft supported by
five main bearings, forged steel connecting rods, and cast aluminum
pistons. The engine runs a firing order of 1-3-4-2.
The F22A6 utilizes a cast-iron block, chosen for durability and
structural rigidity. The long-stroke design and robust block
construction contribute to high thermal stability and excellent
resistance to cylinder wear. Cast iron provides superior longevity for
engines expected to run cleanly for decades. The block houses five main
bearing saddles that support the forged steel crankshaft, ensuring
smooth rotation and reduced NVH.
Oil passages are machined internally to deliver consistent lubrication
to the crankshaft bearings, connecting rod journals, and upper
valvetrain. Coolant jackets run alongside each cylinder, providing even
thermal distribution and reducing the risk of hotspots. The block
includes threaded accessory mounting points for the alternator, power
steering pump, A/C compressor, and engine mounts, contributing to the
engine’s high serviceability.
The cylinder head is constructed from cast aluminum and uses a SOHC
16-valve (four valves per cylinder) configuration. The F22A6 head shares
much of its architecture with the F22A1 but features revised intake
runners and a more aggressive camshaft profile, improving mid-range
breathing.
Valve sizes:
- Intake: approx. 34-35 mm
- Exhaust: approx. 29 mm
The valvetrain uses rocker arms and screw-and-locknut valve lash
adjustment. Periodic adjustment is necessary to maintain proper idle,
smooth acceleration, and fuel efficiency. The combustion chamber design
is a pent-roof layout engineered for efficient burn characteristics and
stable flame propagation. The head gasket is a multi-layer composite
design offering good sealing properties and long-term reliability.
The fuel system uses Honda’s PGM-FI sequential multi-point injection,
with an electric in-tank pump feeding a fuel rail. The injectors are
solenoid-operated high-precision units capable of delivering fine
atomization for efficient combustion. Fuel pressure is controlled via a
vacuum-modulated regulator and falls between 300-350 kPa (43-51 psi).
System sensors include:
- MAP sensor
- TPS
- IAT
- ECT
- Upstream O2 sensor
- CKP/CYP sensors integrated into the distributor
The ECU uses sensor input to regulate injector pulse width and maintain
optimal mixture across operating conditions. Recommended fuel is
unleaded gasoline with at least 91 RON (87 AKI).
The lubrication system is a full-pressure wet-sump design with a
crank-driven trochoid oil pump. The pump provides stable oil delivery at
low and high rpm.
Specifications:
- Oil capacity with filter: 4.0-4.2 liters (4.2-4.4 US quarts)
- Oil pressure at 3,000 rpm: 320-420 kPa (46-61 psi)
- Idle oil pressure: approx. 80-120 kPa (12-17 psi)
The lubrication system routes oil to the main bearings, connecting rods,
camshaft journals, rockers, and valve stems. A full-flow spin-on filter
captures particulates before recirculation. Recommended oil viscosity is
5W-30 or 10W-30 depending on climate. Oil change intervals are
8,000-10,000 km (5,000-6,000 miles).
A closed-loop liquid cooling system maintains stable engine temperature.
Coolant circulates through the block, cylinder head, heater core, and
radiator via a belt-driven centrifugal water pump.
Cooling specifications:
- Coolant capacity: 6.0-6.5 liters (6.3-6.9 US quarts)
- Thermostat opening temperature: 78-82°C (172-180°F)
- Fully open at approx. 95°C (203°F)
- System pressure: approx. 88-110 kPa (13-16 psi)
An aluminum radiator with a thermostatically controlled electric fan
regulates coolant temperature. The system uses bypass channels for
quicker warm-up. Coolant replacement is recommended every 40,000 km
(25,000 miles) or every two years.
| Intake and Exhaust Systems |
Induction is handled by a cast-aluminum intake manifold tuned for
mid-range torque. The F22A6 includes Honda’s “dual-stage” intake runner
control (IAB system), which modifies airflow characteristics at
different RPM ranges for improved torque and responsiveness. A
resonator-equipped airbox reduces intake harmonics.
The exhaust manifold is a cast-iron design engineered for durability and
thermal stability. The F22A6 uses a more efficient tubular-style
manifold compared to the F22A1, improving exhaust flow slightly. A
catalytic converter and O2 sensor support emissions reduction and
closed-loop fuel control.
| Ignition and Electrical System |
Ignition timing is managed by a distributor-based system with integrated
CKP and TDC sensors. The internal ignition coil provides consistent
spark delivery across the operating range.
Electrical specifications:
- Spark plug gap: approx. 1.0-1.1 mm (0.039-0.043 inches)
- Alternator output: approx. 80-90 A
- Starter motor output: approx. 1.0-1.2 kW
- System voltage: 12 V
The ECU regulates ignition timing based on engine load, coolant
temperature, throttle position, and rpm. Spark plugs should be replaced
every 30,000-40,000 km (standard) or up to 80,000 km for platinum plugs.
The F22A6 incorporates:
- PCV system
- EVAP system with charcoal canister
- EGR system for NOx control
- Idle Air Control Valve (IACV)
- Early OBD-I diagnostic capability
- Length: 630 mm (24.8 inches)
- Width: 580 mm (22.8 inches)
- Height: 670 mm (26.4 inches)
Dry weight: approx. 145-155 kg (319-342 lb).
- Oil and filter: 8,000-10,000 km
- Air filter: 20,000-30,000 km
- Spark plugs: 30,000-40,000 km
- Fuel filter: 40,000 km
- Timing belt: 100,000 km
- Valve adjustment: 40,000 km
- Coolant: 40,000 km or 2 years
- Compression: 180-200 psi
- Cylinder head bolts: 30 Nm + 90° + 90°
- Main bearing caps: 60 Nm
- Connecting rod bolts: 40 Nm + 90°
- Flywheel bolts: 88 Nm
- Crank pulley bolt: 245 Nm
- Intake manifold bolts: 22 Nm
- Exhaust manifold nuts: 30 Nm
- Oil drain plug: 40 Nm
- Spark plugs: 18 Nm
The F22A6 was primarily used in:
- Honda Accord EX (1991-1993)
- Regional variants of the Accord with performance-oriented SOHC trim
- Secondary markets as a replacement engine
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