Yes it will but unlike other B series swaps it's not a straight swap. All the swap details can be found on k20a.org
In my opinion it would be the b16a out of the civic si or the k20 out of an rsx-s
everything from a d16z to a k20. depends on how much money you want to spend
you can fit the D16sohc vtec (1.6el) B16a (civic SIR/Si in US) B16b (civic type R) B18b(ls integra) B18B (gsr integra) B18c5 (typeR integra) H22a (prelude) B20b (honda crv) K20 ( rsx type s) K24 (tsx) J35 (honda oddesy) J32 (acura tl/cl type s)
any thing is possible from a reconditioned 1.5l to a k20 type R unit
YES IT WILL FIT
im pretty sure its the k20z3 motor in the new civic si's (09 civic si.) that's stock now i don't know modded it all depends. I'd rather have the k20 type s out of the 05 rsx type s(that's just my opinion). but money wise. you can buy and build a nice GSR(b18c1) for the price of a STOCK k20. Unless money is no option, and you can afford it.
Honda has many different 2.0 vtec engines. typically for a civic it is anywhere from 165hp to 200hp. the newest 2008/2009 civic si that has the k20 motor, produces 200 at the crank and 185 to the wheels. The most powerful 2.0 is found in Honda's S2000 which is 220 hp. These are all 4 cyl. motors also.
5.5 to6.5 if the car is properly serviced and the car has been well maintained. It has been proven that the K20 block which is present in a honda civic type R loses drastic torque if the car is in poor condition/poor maintanence hitting around 7.8-8 seconds.
An H22 or K20.
It all depends on what kind of driving you want to do; be it auto-x, road racing, or drag racing. My opinion would be (if you can afford it) a K20 transplant. The reason i say this is because this would be a good all around motor. (Especially in a Civic Hatch :P)
A K20 engine is a very high power Honda motor. You can most likely buy one off of sites that specialize in selling high power car parts or could possibly contact your local Honda dealership.
theres lots of type of engine u can fit into a 90 integra, sum will direct fit such as all the B series motor that comes with the integra, other u have modifity to fit such as the H22 motor from the Honda prelude or a K20 motor from a RSX