whats the difference?

 

No. Those old B's were freaks.Head bolt pattern and coolant passages, longer cams, various parts of the block and head castings, the distributor, the bore (83mm for the 90-91 B21A)... everything. The trans bolt pattern is probably different too.

90-91 (OBD-0) B18A1 parts are definately what to use.

Once upon a time, there actually was a business that fitted DOHC VTEC heads to those blocks, but they're long gone.

 

its been done, actually i saw this crx with ah AWD drivetrain from a one of those oldschool civic wagon things..wagovan or whatever..but anyways it had the awd and a turbo gsr swapped into it. maybe i can find a link somewhere...

 

i know it's been done, i just wanna see it widespread, the problems with it are the tranny wont handle alot of power, so it's no good

 

why would a b20 be better, dosen't it have alot less hp than the b16 and b18? How much harder would it be to wire a b20?

 

Less horsepower then the B16A, yes. Once the swap is done and B18A/B manifolds are mounted, it will make a touch more horsepower then the B18A/B.

The trick is in the torque. It destroys the B16A and has a heathly margin over the B18A/B when torque is considered.

 

brail auto has a AWD integra....it is a huge waste of time. you also have to remove the factory fuel tank. and well over 200hours labor.

the B20A from old preludes have a 95mm stroke which is really long. piston speed is rediculous with anything above factory redline

 

if your gonna leave it stock, then id get the ls motor cause its just as fast as the b16, then get the b16 tranny for it, and be faster

 

IMO you should aim for the B20. Down the road if you have money laying around you can do a CRVTec and swap on a GS-R, ITR or B16 head.

 

If you are thinking with money involved(which we all are)... here is my opinion:

First of all what are you goals? I'm sure that they are pretty high up there. A b20b or b20z swap is gonna be fun, but things to take into consideration... You have to peice the entire kit together, if you want a good short tranny, it is gonna kill the engine with high revs on the freeway, and you are gonna want to rebuild the block and make it vtec capable eventually... so that IMO rules out doing b20 at first..

Second choice you can make, is a full LS swap. You will have good torque and it's gonna be fun also, but you will want to slap a vtec head on it eventually, and if you want that done right you will rebuild it stronger also. Second bad thing, you have a shitty tranny for NA with the LS swap.

Third choice and the best choice IMO, the B16. Its gonna be pretty cheap upfront cost wise, You will have the head that you want, and the tranny that you want also. You can sport that around, and it'll be fun as hell. While you beat the shit outta that, you can pick up a spare b20b/z block or a b18 block, build it up, and have it ready to swap in at a later date. You'll already have a good head, tranny, and all the other vtec wiring taken care of. It's the smartest move financially and will result in the fastest car for the least amount of money in the end..

Just some things to consider..... and obviously this is all bias cause I got a b16 hatch (I love it btw)