hey im planning to do a engine swap in my 91 integra gs. ive looked thru alot of old forums and they aren't really complete. im wanting to swap this b20b i have because my stock motor is dead. im also gonna do a manual swap and the only tranny i have available is this 94 ls tranny. will the ls tranny work for me? will the b20b swap be a direct bolt/plug and play?

heres a list of things i think is all i need to swap over
Driver side mount
steering pump & bracket
a/c bracket
b18 crank pulley
obd0 distributor
intake manifold injectors, fuel rail, and all sensors
use stock odb0 ecu.
use da axles and intermediate shaft.

is this all? is there anything i have wrong? are there any other things i would need to do? thanks

 

no, that looks pretty solid. not sure you have to use the b18 crank pulley though. i don't remember if i changed that or not when i did mine. but evrything else is spot on.

for the transmission, the 94 is a hydraulically actuated clutch, while your car runs a cable clutch. only way to make it work would be a conversion kit. not worth it for an ls trans. do yourself a huge favor and find a j1 or y1 transmission. if it's a usdm b20b, it will be a dog with just an ls tranny. the shorter gears coupled with the low end torque will even out nicely. the b20b isn't all that much of an upgrade from the b18a. it's got a lame intake cam that really detunes the engine. if i hadn't had the y1 tranny with it, i definitely wouldn't have been pleased.
if you can, swap in your b18a intake cam and find a shorter geared cable trans

 

yeah i got the crank pulley in the list. i dont really have alot of money other than that i would do a gsr swap lol. ill probobly just get a cable tranny then. when you did the swap did you have to change any plugs for sensors or was everything plug and play for you?

 

well, the 90-91 integra has the fan switch on the back of the block, just above the oil filter. it's a 2 wire. should have a big black boot around it. on the b20, the switch will be located at the thermostat housing. you just need to extend the wiring on your engine harness to reach the new switch at the thermostat housing. you'll need the pigtail for the new switch as well, since they are different. also, you need to swap over your exhaust manifold. that's about it.

the b20b is great for the price. i was in the same boat. my b18a lost oil pressure and seized the exhaust cam. so, i picked up the b20 for the same price as a b18a. if you swap the intake cam, it'll make a big difference. you probably want to do the timing belt and waterpump while it's out anyways, so not much more work to swap the cam. the transmission will be the difference between night and day. since you need to find a cable trans anyways, spend the extra couple hundred on a short gear ratio trans. it'll make the car so much funner to drive

 

yeah thanks for the info. yeah i already was planning to do the waterpump and timing belt anyways so ill swap in the intake cam. and as for the tranny i dont know where id be able to pick up a j1 tranny. where did you get yours?

 

mine was actually a y1. got it off the local car forum. came with oem lsd too. 5th gear was pooched though, i assume the PO attempted installing an ls 5th and made an error somewhere. had a friend throw in another ls 5th gear set for me. i paid 200$ for that one. which was a steal, considering the lsd alone was worth 3. that was awhile ago though. maybe 7 years

 

oh yeah, forgot to mention, you'll really want to throw in an ls 5th gear for the highway driving.
it's funny, before i got the 5th swapped in, i was driving around for 2 months with no 5th gear at all...only 4 VERY short gears lol. highway to and from work everyday haha

 

that was a bargain for a lsd tranny lol. but yeah i think ill just find a y1 or j1 tranny and use it in my swap. if i cant find a j1 or y1 would a 90-93 da tranny work? is it bad?

 

Yea a stock LS DA trans will work if you can't find/afford a good one at the moment. I had a B20B swap and had a stock LS trans. It was still pretty zippy but yea a J1 or Y1 would be a great upgrade. I would imagine it would be a very nice upgrade, then if you wanted to you could always add in a lightweight flywheel and nice clutch, then it will rev right up. The B20B is a good reliable engine though. I had put in mine in my DA and it purred like a cat, just ran great. Oh also what el crapitan said about that fan switch, you will have to take your old fan switch from your B18 and thread it into your B20as well.

 

yeah ill pick up a ls da tranny because where i live they are widely available.

 

just out of curiosity, would a b20z swap be no different than a b20b swap? thanks.

and for other people who look at this thread i finally found a nice thread on this swap that is actually has good info
http://forums.g2ic.com/showthread.ph...0b-in-to-90-91

 

The B20Z makes more power compared to the B20B but I think the B20B is an easier swap if I remember right. I dont remember if the stock ECU will run the Z or not.

 

^ There are more then one version of b20b. Theres a usdm that comes in the 96-98 CRV low comp. theres a JDM low comp b20b and a high comp JDM b20b that come in various models 99+.

 

sigh. the elusive b20.
the b20b4 is usdm. the b20b is jdm. as mentioned, there is a high compression jdm b20b, which utilizes the phk pistons. while the low comp jdm b20b and usdm b20b4 sports the p3f dished pistions. the b20z is a usdm only engine which utilizes the high compression phk pistons with an improved intake cam over the b20b4 (b20z intake and exhaust cams are identical to the 94+ integra. in fact, the entire head is identical).
some of the low compression jdm b20b's came equipped with the exclusive p8r head, which uses 33mm intake valves, with a greater volumetric combustion chamber. arguably the best flowing non vtec head honda ever produced

one way to know if your jdm b20b is high or low compression is the knock sensor at the back of the block. high comp utilizes the knock, low, it will be absent.
this engine has many variations. there's more crap, but i can't remember now