I am dumb when It comes to 3rd gens.. - Honda Prelude Forum

PreludeNYC · 01-01-2002, 08:01 PM

Is a 1990 Si DOHC or a 1991 Si DOHC or Both?

Jose

polarwhitesi · 01-01-2002, 08:04 PM

both...the si is a b21 engine, and the 2.0si is a b20 engine. the b21 is just a factory bored out b20...

PreludeNYC · 01-01-2002, 08:11 PM

Quote:

Originally posted by polarwhitesi
both...the si is a b21 engine, and the 2.0si is a b20 engine. the b21 is just a factory bored out b20...

ok, but are they both DOHC? My 87 Si is stock... My cuz has a 3rd gen he has an 88 S he wants to put on a B16 head, he got this great price for a 90 Si engine, b/c I have been told that the B16 won't fit b/c 88 S is SOHC. And before he goes ahead and buys the engine I wanna make sure its DOHC.

He's a member of this site. His username is LUDENNYC.

He's a nooB

So I guess any info would be great!!

Thanks,
Jose

JohnnyRC36 · 01-01-2002, 09:15 PM

both the b21 and b20 are DOHC. the b20 is probably a better candidate for a b16 head because they have the same cylinder bore. then you can also use the b16 pistons for a higher compression. the b20's are usually considered to be a little better of an engine. the b21's had a lot of problems with oil burning and arent very good for rebuilding because of the cylinders.

PreludeNYC · 01-01-2002, 09:17 PM

Quote:

Originally posted by JohnnyRC36
both the b21 and b20 are DOHC. the b20 is probably a better candidate for a b16 head because they have the same cylinder bore. then you can also use the b16 pistons for a higher compression. the b20's are usually considered to be a little better of an engine. the b21's had a lot of problems with oil burning and arent very good for rebuilding because of the cylinders.

Thanks a lot for the info dude...

Jose

JohnnyRC36 · 01-01-2002, 09:20 PM

no problem, let everyone know how the head swap comes out. i would love having a 3rd gen vtec.