B20A

B21A1

Displacement

2.1L (2056 cc)

Configuration

I4

Power

140 hp (104 kW) @ 5800 rpm

Torque

183 Nm (135 lbft) @ 5000 rpm

Compression

9.4:1

Bore × Stroke

83.0 mm x 95.0 mm

Valvetrain

DOHC 16-valve

Aspiration

Normally Aspirated

Fuel System

PGM-FI

OBD

OBD0

Years

1990-1991

Notes

Head casting: PK3

Swaps using the B21A1

Guides mentioning the B21A1

Difficult 1-2 days

Civic Type R 5-Lug Brake and Suspension Conversion for the 1996-2000 Civic (EK)

Easy 15-30 minutes

Honda PGM-FI Fault Code Reading and ECU Reset (OBD0/OBD1/OBD2)

Expert 6-10 hours (excluding paint and parts lead time)

Honda Fit (GE8) JDM 11-Pin Folding, Heated Door Mirror Retrofit

Difficult 6-10 hours

Honda Prelude (4th Gen) Projector Headlight Retrofit

Difficult 4-6 hours

Honda Fit (GE8) LED Taillight and Rear Fog Light Retrofit

Difficult 3-4 hours

Honda Fit (GE8) HomeLink and Ambient Light Retrofit Using an Acura TSX Overhead Console

Moderate 4-6 hours (plus sealant cure time)

DIY Amber City Lights in Honda Headlight Housings

Difficult 3-5 hours

Diagnosing Dead ECT, CMP and Wideband O2 Signals After a K-Series Conversion Harness Swap