Honda F23A1 Specs: 86 x 97 mm (3.3858 x 3.8189 in), 150 hp

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Honda F23A1 specs: 2.3L (137.5 ci) 4-cylinder, 86 x 97 mm (3.3858 x 3.8189 in) bore and stroke, 9.3:1 compression. Rated 150 hp, 1998–2002.

The Honda F23A1 is undersquare — the 3.8189" stroke exceeds the 3.3858" bore by 11.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8189" stroke puts mean piston speed at 4,000 ft/min around 6,300 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 34.4 ci (563 cc).

9.3:1 is low by modern standards and generally happy on regular pump fuel.

It is one of 10 engines in the F-series family, the largest at 137.5 ci. 5 factory variants share these dimensions, rated at 150 hp across 1998–2002.

Dimensions

Displacement	137.5 ci / 2.3 L
Bore	3.3858"
Stroke	3.8189"
Cylinders	4
Configuration	I4
Compression ratio	9.3:1
Bore/stroke ratio	0.887

Construction

Valvetrain	SOHC
Fuel type	gas
Advertised HP	150 hp
Years	1998–2002

Factory ratings by year

Year	Version	HP @ rpm	Torque @ rpm	Comp.
1998	F23A1 net	150 @ 5700	152 lb-ft @ 4900	9.3:1
1999	F23A1 net	150 @ 5700	152 lb-ft @ 4900	9.3:1
2000	F23A1 net	150 @ 5700	152 lb-ft @ 4900	9.3:1
2001	F23A1 net	150 @ 5700	152 lb-ft @ 4900	9.3:1
2002	F23A1 net	150 @ 5700	152 lb-ft @ 4900	9.3:1

Factory specification sheet.

What these numbers mean

Bore/stroke character	0.887 — undersquare — stroke exceeds bore, which favours low-end torque
Mean piston speed at 6,000 RPM	3,819 ft/min — in the range typical of performance street engines
Displacement per cylinder	34.4 ci
Static compression	9.3:1 — low by modern standards, generally happy on regular pump fuel

Run the numbers for this engine

Each link opens the calculator with this engine's specs already filled in.

• Displacement from bore and stroke (calculator)
• Static and dynamic compression ratio calculator
• Piston ring gap for this bore
• Piston speed at any RPM
• Horsepower to torque at any RPM
• What size carburetor (CFM calculator)

Variants sharing these dimensions (5)

These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.

Year	Advertised HP	Code
1998	150 hp	F23A1
1999	150 hp	F23A1
2000	150 hp	F23A1
2001	150 hp	F23A1
2002	150 hp	F23A1

What cars have the F23A1?

2 factory vehicles, 1998–2002. Each year opens that model's engine table.

• Honda Accord: 1998, 150 hp; 1999, 150 hp; 2000, 150 hp; 2001, 150 hp; 2002, 150 hp
• Acura CL: 1998, 150 hp; 1999, 150 hp

Similar engines

• Honda F23A — 137.5 ci
• Honda F23A5 — 137.5 ci
• Honda F22 — 131.6 ci
• Honda F22A1 — 131.6 ci
• Honda H23A VTEC — 137.9 ci
• Honda H23A — 137.9 ci
• Mazda KJ-ZEM — 137.6 ci
• Acura H23A — 137.9 ci

← All F-series engines