Some useful B20a Info

[bullard123]

http://en.wikipedia.org/wiki/Honda_B20A_engine

[Steve_Si]

http://en.wikipedia.org/wiki/Honda_B20A_engine

Hmmm there is a Prelude Si States for sale locally. Pity those 3rd gen lude engines don't fit :( 185HP would be great :D

[TWOLOUDNPROUD]

Partially unrelated to the Honda B-series engines are the B20A and B21A. By some, these are not considered to be part of the B-series group of engines because they are not compatible with any of the other B-series parts or 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, 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 ft·lbf torque.

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".
The B20A, B20A3, and B20A5 engines consisted of closed-deck aluminum blocks with thicker-than-average iron sleeves where as the B21A1 had some special material.

The B21A1 was basically a re-worked B20A5 with an increase in bore to 83 mm. The external block dimensions had to stay identical to the B20A5 block so Honda called upon Saffil to create a thin but strong cylinder liner called FRM (Fiber Reinforced Metal) which basically consisted of a carbon fiber matrix, aluminum alloy, and aluminum oxide to make a very strong cylinder sleeve. These sleeves are so strong that they often do not lose their factory cross-hatching marks after 200,000 miles! A lot of B21A1 engines burn oil and have low cylinder compression numbers because the FRM material is so strong that it tears up piston rings. Good news though, you can usually replace the piston rings without any honing to the sleeves and go another 100,000+ miles without any sleeve wear.

B20A
(16-Valve, 4 Cylinder, DOHC, PGM-FI)

Found in:
Serial numbers 1000001~, 1500001~ and 1550001~ (Gold Valve Cover)
1985-1986 Honda Prelude Non-U.S.
1985-1986 Honda Accord Non-U.S.
1985-1986 Honda Vigor Non-U.S.
Serial numbers 1600001~ and 1640001~ (Black Valve Cover)
1987-1989 Honda Accord Non-U.S.
1987-1989 Honda Vigor Non-U.S.
Displacement: 1958 cc
Compression: 9.4:1
Power: 160 hp @ 6300 rpm & 140 ft·lbf @ 5000 rpm
Transmission: B2K5, F2K5

[thegreatdane]

Hmmm there is a Prelude Si States for sale locally. Pity those 3rd gen lude engines don't fit :( 185HP would be great :D

THey have the same engines as the rest of the ludes so you're not missing out on anything ;)

[bullard123]

Those jdm transmission numbers are very important. Because these importers like to think of the b20a as the U.S. 88-91 prelude

[snoopyloopy]

heh, i did up a small part of that article. as well as the a-series one. the a-series one was a sorry mess.

[carotman]

I did most of that B20A article. Where do you think those engine numbers come from? :D

[MessyHonda]

I did most of that B20A article. Where do you think those engine numbers come from? :D

:bow:

[bullard123]

I did most of that B20A article. Where do you think those engine numbers come from? :D

I should have guessed Carotman. Hey can you guys make this a sticky?? The transmission codes are really helpful when dealing with these uneducated engine importers lol.

[A20A1]

I thought it already was a sticky somewhere.

[snoopyloopy]

I did most of that B20A article. Where do you think those engine numbers come from? :D

ahh, ok. only makes sense. :bow: bc i sure didn't come up w/ that info myself. good job on it, man.