Honda F18B engine
|Manufacturer||Honda Motor Company
|Also called||Honda F18
|Cylinder block alloy||Aluminum|
4 valves per cylinder
|Piston stroke, mm (inch)||81.5 (3.21)|
|Cylinder bore, mm (inch)||85 (3.35)|
|Displacement||1849 cc (112.8 cu in)
|Power output||77 kW (105 HP) at 6,000 rpm
84 kW (115 HP) at 5,500 rpm
102 kW (140 HP) at 6,100 rpm
|Torque output||143 Nm (105 lb·ft) at 4,000 rpm
158 Nm (116 lb·ft) at 4,200 rpm
168 Nm (124 lb·ft) at 5,000 rpm
|HP per liter||56
|Weight, kg (lbs)||135 (300)
|Fuel consumption, L/100 km (mpg)
|Turbocharger|| Naturally aspirated
|Oil consumption , L/1000 km
(qt. per miles)
|up to 0.5
(1 qt. per 1200 miles)
|Recommended engine oil||5W-30
|Engine oil capacity, L (qt.)||3.8 (4.0)
|Oil change interval, km (miles)||5,000-10,000
|Normal engine operating temperature, °C (F)||90-95 (194-203)|
|Engine lifespan, km (miles)
-No life span loss
|The engine is installed in||Honda Accord
In September 1989, the 4th generation Honda Accord was launched, equipped with a new 1.8 liter F-family engine nominated as F18.
This engine used a 219.5 mm high 4-cylinder aluminum open deck cylinder block. A 81.5 mm stroke crankshaft and balancer shafts were installed inside the block. Connecting rods length is 148 mm and cylinder diameter is 85 mm. This provides the displacement of 1.85 l.
For F18A engines, non-VTEC SOHC head with 4 valves per cylinder was used. In version F18B, a VTEC system was used. Here are valve dimensions: intake 34 mm, exhaust 29 mm.
Don’t forget to adjust valves approximately after every 25,000-30,000 miles.
For a cold engine, intake valves clearance is 0.24-0.28 mm, exhaust valves clearance is 0.28-0.32 mm.
Both F18A and F18B engines use a timing belt to be replaced after every 60,000 miles. If the timing belt breaks at low revs, the valves will remain intact. If the timing belt breaks in the VTEC zone, the valves will be bent.
This engine belongs to the Honda F-series, which also included related F20, F20C, F22, F22C and F23 engines.
The F18B engine was made until 2002, when it was replaced by a 2-liter K20A.
Honda F18B engine modifications and differences
1. F18A (1989 – 1999) – there were two different versions of this engine:
– Up to 1993, carburetor F18A was made. It was found in the JDM Honda Accord and Ascot. Its power was 105 HP @ 6,000 rpm, the torque was 143 Nm @ 4,000 rpm.
– Up to 1999, F18A with electronic fuel injection system were made. It specs were improved: power 115 HP @ 5,500 rpm, the torque was 158 Nm @ 4,200 rpm. You can buy a Honda Accord and a Rover 618i with this engine.
2. F18B (1993 – 2002) is the version with a VTEC head. This engine is much more powerful – 140 HP @ 6,100 rpm with the torque of 168 Nm at 5,000 rpm. It was installed into Honda Accord and Torneo.
Honda F18B engine problems and malfunctions
All F-family and H-family engines are very similar, and have similar problems. You can learn about problems with your F18A/F18B HERE.
The simplest upgrade of F18 is turning into a F23A. For this purpose, increase the cylinder bore to 86 mm, specially for F23A pistons. You will also need a F23A crank and F23A rods. Don’t forget to buy a F23A head gasket, but that will still not be enough. To make the engine rub smoothly, you will need F23A intake and exhaust systems, a fuel system, and an ECU. And these are just main components. In the end, it is easier to buy a F23A and make a swap, or choose a more powerful car for performance tuning.