Honda F engine

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The Honda F-Series engine was Honda's "big block" SOHC inline four, though lower production DOHC versions of the F-series were built. It features an aluminum open deck cast iron sleeved block and aluminum/magnesium cylinder head. Honda's F22B1 Engine won a spot on the Ward's 10 Best Engines List in 1995 and 1996.

SOHC engines

F18A

This engine was used by Honda.

• Bore × Stroke: 85.0 × 81.0 mm
• Displacement: 1849 cc
• Valve Configuration: SOHC, 16 valves
• 118 bhp up to 1997
• 105PS @ 6000 rpm, 14.6 kg m @ 4000 rpm (PGM-carb)
• Fuel consumption : 13.0 km/l

F18B

This engine was used for the Honda Accord 1.8 VTS/VTE in Japan. Also found in the European Honda Accord Vtec S.

Specifications

• Bore × Stroke: 85.0 × 81.0 mm
• Displacement: 1849 cc
• Valve Configuration: SOHC, 16 valves, VTEC
• Compression ratio: 9.3:1
• Max power: 138PS (103 kW)
• Max torque: 124 ft·lbf (165 N m)

F20A

This engine series was used in the Honda Accords in Japan and Europe. The DOHC F20A was also derived from this engine (see below).

Specifications

• Bore × Stroke: 85.0 × 88.0 mm
• Displacement: 1997 cc
• Compression ratio : 9.5:1
• Valve Configuration: SOHC, 16 valves
• Max output : F20A2 / F20A8 110 PS @ 6000 rpm (PGM-carb)
• Max output : F20A4 133 PS @ 5400 rpm (PGM-Fi)
• Max output : F20A5 150 Ps @ 5400 rpm (PGM-Fi)
• Max output : F20A7 135 PS @ 5600 rpm (PGM-Fi)
• Max torque : F20A2 / F20A4 / F20A8 18.5 kg m @ 4300 rpm (PGM-Fi), 16.1 kg m @ 3800 rpm (PGM-carb)
• Max torque : F20A7 19.3 kg m @ 4400 rpm (PGM-Fi)
• Fuel consumption (Japan Combined Cycle) : 9.6 km/l (PGM-Fi), 9.8 km/l (PGM-carb)

This engine also spawned many variants, according to market, but the specs remain largely similar, The F20A5 it's used in the Cb3 and Cb4 Chassis

The F20A7 is only used in the european "Accord Coupé 92-93" CC1 chassis as unique motorisation.

F20B

Specifications

• Displacement: 1997 cc
• Configuration Valve: SOHC/DOHC, 16 valves, VTEC/Non-Vtec

This engine came in SOHC in vtec and non vtec, there is also a DOHC VTEC version of the engine, they all share the same engine code although they are very different.

The DOHC VTEC version comes with a blue powder coated valve cover as the H23A VTEC from the japanese accord sir-t. They're called BLUE TOP and are only from japan.

DOHC VTEC Manual Version:

• 197 HP @ 7200RPM
• 145 TQ @ 6600RPM
• 11.0:1 CR
• 85mm bore
• 88mm stroke
• 23mm wrist pin
• 145.5mm rods (f20b rod length = 145.425)
• 1.65 r/s ratio
• 55mm mains like h22a4 block

rod journal has been offset ground on both sides to the size of a b-series rod journal.

F20Z

This engine series is similar to the F20A above, used in the Honda Accord in Asia and Europe.

Specifications

• Bore × Stroke: 85.0 × 88.0 mm
• Displacement: 1997 cc
• Valve Configuration: SOHC, 16 valves

F22A

This engine series was used in the Honda Accord and Honda Prelude S. Aside from differences in tuning, these engines are substantially similar.

Specifications

• Bore × Stroke: 85.0 × 95.0 mm
• Displacement: 2156 cc
• Valve Configuration: SOHC, 16 valves, non-VTEC
• Compression ratio: 8.8:1
• Max power:
  • F22A1: 125 hp (93.21 4 kW) @ 5200 rpm. NOTE* The 1992-1996 Prelude S had a F22A1 but because of a different more aggressively tuned ECU (P12), the power output was 135 hp (101 kW).
  • F22A4: 130 hp (96.94 kW) @ 5200 rpm. The F22A4 is the same motor as the F22A1 but it has slightly more power due to a tubular designed header and slightly bigger exhaust piping.
  • F22A6: 140 hp (104.40 kW) @ 5600 rpm. The F22A6 is the same as the F22A1 except for a slightly more aggressive camshaft, a better flowing cast exhaust manifold, a different more aggressively tuned ECU (PT6), and a different intake manifold that utilizes IAB's and also has a bigger plenum. The F22A6 also has a windage tray in the oil pan, and stiffer valve springs to accommodate the more aggressive camshaft.
  • F22A7: 140 hp (104.40 kW) @ 5900 rpm (147 hp/108 kW with manual transmission)
• Max torque:
  • F22A1: 137 ft·lbf (186 N m) @ 4000 rpm
  • F22A4: 142 ft·lbf (193 N m) @ 4000 rpm
  • F22A6: 142 ft·lbf (193 N m) @ 4500 rpm
  • F22A7: 145 ft·lbf (198 N m) @ 5000 rpm

F22B1

This engine was used in the Honda Accord EX and Acura CL 2.2. It was the first F engine to feature VTEC. This engine has a different head than the f22a6 (specifically exhaust manifold/header-pipe as well as intake gasket).

Specifications

• Bore × Stroke: 85.0 × 95.0 mm
• Displacement: 2156 cc
• Valve Configuration: SOHC, 16 valves, VTEC
• Compression ratio: 8.8:1
• Max power: 145 hp (108 kW) @ 5500 rpm
• Max torque: 147 ft·lbf (199 N m) @ 4500 rpm

F22B2

This engine was used in the 1994-1997 Honda Accord DX, LX and SE. The F22B6 in the 1995-1997 Honda Odyssey and the F22B8 in the Honda Shuttle are substantially similar. Also the F22B3 engine used in the 1994-1997 Australian and New Zealand Honda Accord LXi are basically the same engine apart from slightly different intake and exhaust manifolds.

Specifications

• Bore × Stroke: 85.0 × 95.0 mm
• Displacement: 2156 cc
• Valve Configuration: SOHC, 16 valves
• Compression ratio: 8.8:1
• Max power: 130 hp (97 kW) @ 5300 rpm
• Max torque: 139 ft·lbf (188 N m) @ 4200 rpm

The F22B in the BA9 Prelude had a DOHC configuration

JDM engines were stamped only as F22B.

F22Z2

This engine was used in the Honda Accord 2.2i.

Specifications

• Bore × Stroke: 85.0 × 95.0 mm
• Displacement: 2156 cc
• Valve Configuration: SOHC, 16 valves, VTEC
• Compression ratio: 9.3:1
• Max power: 150 hp (112 kW) @ 5500 rpm
• Max torque: 148 ft·lbf (200 Nm) @ 4500 rpm

F23A1

This engine was used in the 1998-2002 Honda Accord LX, EX, and SE, and in the Acura 2.3CL in North America.

Specifications

• Bore × Stroke: 86.0 × 97.0 mm
• Displacement: 2254 cc
• Valve Configuration: SOHC, 16 valves, VTEC
• Compression ratio: 9.3:1
• Max power: 150 hp (112 kW) @ 5700 rpm
• Max torque: 152 ft·lbf (205 N m) @ 4900 rpm

F23A4

This engine was used in the 1998-2002 Honda Accord ULEV models. It is substantially similar to the F23A1, but features ULEV certification with a slight reduction of power: 150 hp (110 kW) with a maximum torque of 160 ft·lbf (200 Nm). This engine has a different exhaust manifold and a 32-bit ECU which uses a wideband oxygen sensor.

F23A5

This engine was used in the 1998-2002 Honda Accord DX and the 2002 Honda Accord LX VP (value package) in North America.

Specifications

• Bore × Stroke: 86.0 × 97.0 mm
• Displacement: 2254 cc
• Valve Configuration: SOHC, 16 valves
• Compression ratio: 8.8:1
• Max power: 135 hp (100 kW) @ 5500 rpm
• Max torque: 153 ft·lbf (206 Nm) @ 4500 rpm

F23A7

This engine was substantially similar to the F23A1. It was used in the 1998 Honda Odyssey and the 1998-1999 Isuzu Oasis.

DOHC engines

F20A

This engine was used in the 1990-1993 CB3 and CB4Honda Accord 2.0Si and Si-T in Japan. And the Honda prelude BB3-BB9 96-01 in Europe.

Specifications

• Bore × Stroke: 85.0 × 88.0 mm
• Displacement: 1997 cc
• Valve Configuration: DOHC, 16 valves
• Compression ratio: 9.5:1
• Max power: 150 hp (112 kW) @ 6100 rpm
• Max torque: 137 ft·lbf (186 Nm) @ 5000 rpm

F20B

This engine series was used in the CF4, CF5, CF9, CL3 Honda Accord and Honda Torneo from Japan. It uses a DOHC VTEC cylinder head similar to the H22A found in the Prelude but was designed to comply with many countries' sub-2.0 liter tax. The automatic transmission versions received the lower hp version (180 hp), as it was tuned for more mid-range torque than its manual transmission counterpart.

Specifications

• Accord SiR wagon, SiR-T F20B 97-01 2.0L
• Valve train: 4 Cylinder, DOHC VTEC, 16 Valve
• Bore: 85.0 mm
• Stroke: 88.0 mm
• Displacement: 1997 cc
• Torque: 145 ft·lbf (197 N·m) @ 5500 rpm
• Horsepower: 200 hp (150 kW) @ 7000 rpm
• Red Line: 8200 rpm
• Compression: 11.0:1
• Fuel Control: OBD-2

F20C

This engine was a radical departure from previous F engines, and only shared basic dimensions such as bore spacing. It was designed specifically for the Honda S2000 and shares some engineering with the Honda K engine. A long-stroke F22C1 variant was also produced.

F22B

This engine was used in the 1992-1996 Honda Prelude Si in Japan. It is similar to the H23A

Specifications

• 2.2L
• Bore × Stroke: 85.0 × 95.0 mm
• Displacement: 2156 cc
• Valve Configuration: DOHC, 16 valves
• Compression ratio: 9.3:1
• Max power: 166 hp (119 kW) @ 6000 rpm
• Max torque: 150 ft·lbf (200 N m) @ 5000 rpm