Honda B20A engine - AbsoluteAstronomy.com

Partially unrelated to the Honda

Honda

is a Japanese public multinational corporation primarily known as a manufacturer of automobiles and motorcycles.Honda has been the world's largest motorcycle manufacturer since 1959, as well as the world's largest manufacturer of internal combustion engines measured by volume, producing more than...

B-series

Honda B engine

The Honda B-series are inline-4 DOHC automotive engines. They were made in 1.6, 1.7, 1.8, and 2.0 liter variants, with and without VTEC . Later models have minor upgrades including modifications to the intake valves and ports and piston tops, along with individual cylinder oil injectors...

engines are the B20A and B21A. By some (by tuners), these are not considered to be part of the B-series

Honda B engine

group of engines because they are not compatible with most of the other B-series parts and all of the other B series chassis.

There were 2 versions of the B20A

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 160 hp and 140 lbft torque in Japan. In Europe this called B20A1, produces 137 hp and 127 lb.ft (172 Nm).

- There was also a similar engine named B18A for the 86-89 Accords. It was a destroked B20A powered by 2 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 lay 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 (similar to straight 6 designs in older BMW's).

The B20A, B20A3, and B20A5 engines consisted of closed-deck aluminum blocks with thicker-than-average iron sleeves where as the B21A1 had FRM (fiber reinforced metal)

Metal matrix composite

A metal matrix composite is composite material with at least two constituent parts, one being a metal. The other material may be a different metal or another material, such as a ceramic or organic compound. When at least three materials are present, it is called a hybrid composite...

cylinder liners.

The B21A1 was basically a re-worked B20A5 with an increase in bore to 83 mm (3.3 in). The external block dimensions had to stay identical (although there was increased external strengthening and webbing on the B21) to the B20A5 block so Honda called upon Saffil to create a thin but strong cylinder liner called FRM (fiber reinforced metal)

Metal matrix composite

which basically consisted of a carbon fiber matrix, aluminum alloy, and aluminum oxide to make a very strong cylinder sleeve. The sleeve is so strong, in fact, that it wears out the piston rings causing low compression numbers, severe smoking, and high oil usage. It is possible in many situations to merely replace the worn rings in order to revive the motor's former output. Many machine shops will not attempt to re-hone or re-bore the FRM sleeves, as this type of sleeve will de-laminate during machining operations.

B20A,B20A1

(16-Valve, 4 Cylinder, DOHC, PGM-FI)

"Honda" logo in center of valve cover - Filler cap on left side of cover.
Found in:
- Serial numbers 1000001~, 1500001~ and 1550001~
  - 1985-1986 Honda Prelude
    Honda Prelude
    The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
    
    Non-U.S.
  - 1985-1986 Honda Accord
    Honda Accord
    The Honda Accord is a series of compact, mid-size and full-size automobiles manufactured by Honda since 1976, and sold in a majority of automotive markets throughout the world....
    
    Non-U.S.
  - 1985-1986 Honda Vigor Non-U.S.
- Serial numbers 1600001~ and 1640001~
  - 1987-1989 Honda Vigor Non-U.S.
Displacement: 1958 cc
- bore: 81 mm (3.2 in)
- stroke: 95 mm (3.7 in)
Compression: 9.4:1; 9.5:1
Power:
- (JDM GOLD TOP B20A 1986-1987) 160 hp @ 6300 rpm & 137 lb.ft (186 N·m) @ 4000 rpm, using PH3 ECU
- (JDM BLACKTOP B20A 1988-1989) 160 hp @ 6200 rpm & 137 lb.ft (186 N·m) @ 4000 rpm, using PH3 ECU (Some think this engine have same spec as black top from 88-91 prelude, but this is not. This engine is still 160 hp. just like the gold top)
- (EDM, B20A1 Gold Top) 137 hp @ 6000 rpm & 127 lb.ft (172 N·m) @ 4000 rpm, using PJ5(602,603,752),PJ7,PH3 ECU w vac. advance
Transmission: B2K5(86-87), F2K5(88-89)

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B20A

This is for the B20a that came in 88-91 Preludes, not the same motor as listed above.
(16-Valve, 4 Cylinder, DOHC, PGM-FI)

Found in:
- 1988-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Non-U.S.
Power: 143 hp @ 6000 rpm
Torque: 128tq @ 4500 rpm
Compression ratio: 9.4:1

B20A2

(16-Valve, 4 Cylinder, DOHC, PGM-FI)

Found in:
- 1987-1989 Honda Accord
  Honda Accord
  The Honda Accord is a series of compact, mid-size and full-size automobiles manufactured by Honda since 1976, and sold in a majority of automotive markets throughout the world....
  
  Non-U.S.
Power: 142 hp @ 6200 rpm

B20A3

(12-valve, SOHC, dual side-draft carburetors)

Found in:
- 1988-1990 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  2.0 S
Power: 104 hp @ 5800 rpm (MT)With cata, 115 hp @ 5800 rpm without cata
Torque: 111 lbft @ 4000 rpm
It was PGM-CARB microprocesor controlled (pk-1)

B20A4

(12-Valve, SOHC, dual side-draft carburetors)

Found in:
- 1988-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Non-U.S.

B20A5

(16-valve, DOHC, PGM-FI)

Found in:
- 1988-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  2.0Si
Power: 135 hp @ 6200 rpm
Torque: 127 lbft @ 4000 rpm
Engine cc: 1958.14
Cylinder cc: 489.535
Deck cc: 13.885
Head cc: 47.3
Compression Ratio: 9.0:1

B20A6

(16-Valve, DOHC, PGM-FI)

Found in:
- 1988-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Non-U.S. New Zealand, and Australian Domestic Market

142 hp@6000 rpm
174 Nm@4500 rpm
KY model is one of them

B20A7

(16-Valve, DOHC, PGM-FI)

Found in:
- 1988-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Non-U.S. UK, France, Holland, Norway, South Africa
Power 150 hp@6000 rpm
- 132tq (180 Nm) @ 5500rpm
  - Compression ratio 10.5:1

B20A8

(16-Valve, DOHC, PGM-FI)

Found in:
- 1988-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Non-U.S. Russian, Swedish Domestic Market
- 1988-1989 Honda Accord
  Honda Accord
  The Honda Accord is a series of compact, mid-size and full-size automobiles manufactured by Honda since 1976, and sold in a majority of automotive markets throughout the world....
  
  Non-U.S.
Power 133 hp

B20A9

(16-Valve, 4Cylinder, DOHC, PGM-FI)

Found in:
- 1990-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Non-U.S. Finland, German, Norway, Netherlands, Russia, Argentina
Power 139 hp@6000 rpm
Torque 129tq (175 Nm) @ 4500rpm
Cylinder cc: 489.535
Deck cc: 13.885
Head cc: 47.3
Compression ratio 9,3:1

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B21A

(16-valve, DOHC, PGM-FI)

Found in:
- 1990-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  Si States
Very rare, it was only produced for the "Si States" models in Japan
Power: 145 hp
Torque: 186 N·m (137 lbf·ft)
Compression Ratio: 9.4:1

engine using a pk-3 honda ECU
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B21A1

(16-valve, DOHC, PGM-FI)

Found in:
- 1990-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  SI USDM
- 1990-1991 Honda Prelude
  Honda Prelude
  The Honda Prelude was a sports coupe produced by Japanese automaker Honda from 1978 until 2001. It replaced the Honda S800, a front-engined, front wheel drive sports car...
  
  SR Canadian Market
Power: 140 hp @5800 rpm
Torque: 135 lbft @5000 rpm
Engine cc: 2056.03
Cylinder cc: 514.0075
Deck cc: 10.191
Head cc: 51.0
Compression Ratio: 9.4:1

Sources

The source of this article is wikipedia, the free encyclopedia. The text of this article is licensed under the GFDL.

B20A,B20A1

B20A

B20A2

B20A3

B20A4

B20A5

B20A6

B20A7

B20A8

B20A9

B21A

B21A1

See also

Sources