Honda B20A engine

• The first generation of B20A engines was available in the 86–87 Prelude 2.0SI in Japan and Europe, the 86–89 Honda Vigor and Accord. It leaned towards the front of the car just like the A20A engine found in the same cars. This B20A produces and torque in Japan. In Europe this is called B20A1, produces and 127 lb.ft.
• * There was also a similar engine named B18A for the 86–89 Accords. It was a destroked B20A powered by two sidedraft Keihin carbs.
• The second generation of B20A was found in the 88–91 Prelude. The 88–91 Prelude B20A and B21A blocks are cast so they lie at an 18-degree angle leaning towards the firewall. This was done to please the exterior specifications for the 1988–1991 3rd Generation Prelude due to its ultra-low hoodline which Honda dubs the "engineless design" and also for handling reasons due to placing the engine at an angle gives it a lower center of gravity.

B20A, B20A1

• "Honda" logo in center of valve cover – Filler cap on left side of cover.
• Found in:
• * Serial numbers 1000001~, 1500001~ and 1550001~
• ** 1985–1987.03 Honda Prelude Non-U.S.
• ** 1985.06–1987.04 Honda Accord Non-U.S.
• ** 1985.06–1987.04 Honda Vigor Non-U.S.
• * Serial numbers 1600001~ and 1640001~
• ** 1987.05–1989.08 Honda Accord Non-U.S.
• ** 1987.05–1989.08 Honda Vigor Non-U.S.
• Displacement: 1958 cc
• * bore:
• * stroke:
• Compression: 9.4:1
• Power:
• * at 6300 rpm & 137 lb.ft at 5000 rpm, using PH3 ECU
• * at 6200 rpm & 127 lb.ft at 4000 rpm, using PH3 ECU
• * at 6000 rpm & 127 lb.ft at 4000 rpm, using PJ5,PJ7,PH3 ECU w vac. advance
• Transmission: B2K5, F2K5

• Found in:
• * 1988–1991 Honda Prelude Non-U.S.
• Power: at 6000 rpm
• Torque: 128tq at 4500 rpm
• Compression ratio: 9.4:1

  B20A2

• Found in:
• * 1987–1989 Honda Accord Non-U.S.
• Power: at 6000 rpm

  B20A3

• Found in:
• * 1988–1990 Honda Prelude 2.0 S
• Power: at 5800 rpm with catalytic converter, at 5800 rpm without catalytic converter
• Torque: at 4000 rpm
• It was PGM-CARB microprocessor controlled

  B20A4

• Found in: 1988–1991 Honda Prelude Non-U.S.
• Fuel system: 2 carburetors
• Displacement : 1958
• Bore x Stroke : 81 x 95
• Compression ration: 9.2:1
• Maximum power: 114 hp at 5800 rpm
• Maximum torque: 116 ft lb at 4500 rpm
• Catalytic converter: no
• ECU: no

  B20A5

• Found in:
• * 1988–1991 Honda Prelude 2.0Si
• Power: at 6200 rpm
• Torque: at 4000 rpm
• Engine cc: 1958.14
• Cylinder cc: 489.535
• Deck cc: 13.885
• Head cc: 47.3
• Compression Ratio: 9.0:1

  B20A6

• Found in:
• * 1988–1991 Honda Prelude Non-U.S. and Australian Domestic Market

B20A7

• Found in:
• * 1988–1991 Honda Prelude Non-U.S. UK, France, Holland, Norway, South Africa, New Zealand
• Power at 6000 rpm
• Torque 132tq at 5500rpm
• Compression ratio 10.5:1
• Bore 81 mm
• Stroke 95 mm
• Engine capacity 1958 cm3 or 119.5 cu-in

  B20A8

• Found in:
• * 1988–1991 Honda Prelude Non-U.S. Russian, Swedish Domestic Market
• * 1988–1989 Honda Accord Non-U.S.
• Power at 6000 rpm

  B20A9

• Found in:
• * 1990–1991 Honda Prelude Non-U.S. Finland, Germany, Norway, Netherlands, Russia, Argentina
• Power at 6000 rpm
• Torque 129tq at 4500 rpm
• Cylinder cc: 489.535
• Deck cc: 13.885
• Head cc: 47.3
• Compression ratio 9,3:1

B21A

• Found in:
• * 1990–1991 Honda Prelude Si States
• Very rare, it was only produced for the "Si States" models in Japan
• Power:
• Torque: 186 N·m
• Compression Ratio: 9.4:1

B21A1

• Found in:
• * 1990–1991 Honda Prelude SI USDM
• * 1990–1991 Honda Prelude SR Canadian Market
• Power: at 5800 rpm
• Torque: at 5000 rpm
• Engine cc: 2056.03
• Bore 83 mm
• Stroke 95 mm
• Cylinder cc: 514.0075
• Deck cc: 10.191
• Head cc: 51.0
• Compression Ratio: 9.4:1