b20/vtec hybrid questions

i know if i take a b20 from a prelude and put a b16head and wiring and ecu and stuff ittl work but would the b16 head even really be good enough. and if it is , will it still redline at 8500 rpm like before or will i have to reset my afc and vtec controller. i can get a b20 block and rebuild it for next to nothing and i have the b16 but i dont wanna waste the money if i wont gain much, i plan to stay all motor maybe a little of the bottle but nothin crazy. any help would be appreciated.

Thanks

or would a b18b lower end be a better match for flow and power and rpm

Correct me if I'm wrong but a b20 is from a CRV, preludes have H22a's and H22b's. If you do, do the b20 vtec swap I've heard its a beast if you can do it right. Good luck

b20 = crv h22 = prelude so yea you were right zippeay

the b20 was used in the 89-91 preludes as well there are very small differences in the blocks but they are still the same,
also where would i have to drill those oil line holes where you hook the line from the block to the heah and stuff.

hmm i learned something new i didnt know that sorry i doubted you

ive heard from many sources that you cant use the old prelude Si b20. but they may be wrong i guess:rolleyes: and no with that head it doesnt mean you can rev it that high. in theory the head allows it to go that high but the block would fry before you get to redline. no oil squirters for the pistons. and also when doin this changeover it gives i think about 8.5:1 compression. someone correct that if im wrong. but if im right it wont be very fast. yah it may have torque but not enough to justify the cost. if youre doing the crvtec get type r pistons or JE high compression ones and put them on before you close it up. night and day difference in power merely from pistons.

There are a ton of sites out there that tell you step by step on how to drill the oil lines and everything or you can bring the instructions to a machine shop and they can do it for you. I read a lot on this because I almost did it myself but I was worried about the reliability of the motor after doing all the work to it so I never did. I know theres a place in North Carolina Called Redline motorsports that does a lot of B20 Vtec work and they claim its way better than the LS Vtec and its also cheaper but hey I don't know for sure. Good luck with it though

hey thanks guys ill look into that and i still havnt decded i might just leave it alone
thanks
donnie

the block would fry before you get to redline. no oil squirters for the pistons
edman
so does the crv b20 have oil sprayers for the pistons or were you sayin that all b20s dont have them
thanks

Originally posted by OneSikCRX
hey thanks guys ill look into that and i still havnt decded i might just leave it alone
thanks
donnie Don't do it,the old prelude blocks aren't very good for it.If you need info I can get it,but really they aren't,don't waste your money.You would need to rebuild the internals to handle the high revs that are going to make the additional displacement worth the trouble.Like they mentioned before if you can get a CRV then that is a good block for it.But also the CRvtec isn't really cost effective and frankensteins are best if you have the motor (ls,crv) in your car already and are looking for extra power.They require knowledgable assembley,since your plugging and tapping and drilling the lifeline of the motor being the oil lines to the head,and you don't want to half ass them or you'll end up with a busted motor.

doin the rebuildin and custom work isnt the problem ive done that kind of stuff a million times its what parts to use to make it work i wanna know, im not worried about messin somethin up. i wont jump into things that are too hard for me to do, fortunately i kinda know my limits unliike some people here in desmoines. ;) like a guy here reprogramin ecus and takin off rev limiters, not a good idea on any motor, let alone a sohc civic
thanks

no the b20 blocks dont have oil squirters. only the vtec blocks have oil squirters

The whole reason behind the oil line is to act like an oil squirter, that's why I didn't want to do it I really didn't want to spend all that money and blow the engine

i know what the oil line is for but you cant tell me that you think that oil line works nearly as good as the stock oil squirters. theres no way or else people would be able to rev their b20's to hell without any problems. with a b20vtec revving is not where you get your power so dont worry too jmuch about revving it high.

Thats exactly why I didn't do that swap because I was thinking the same thing, why spend all that money and trust your engine on one oil line? Too risky for me

no no no youre thinking is wrong in this situation. the engine does not depend on that one oil line. its is there as a small buffer but not somehing to rely on. most engines dont have oil squirters and are just fine. its up to you to keep it in a safe rev range. and if you do you will be very happy with the results.

The lsvtec needs the oil line to function,it IS the lifeline for the head.

I'm just really not impressed with an engine that has so many restrictions, yeah know. I mean you need that oil line, you can't rev too much = to much crap I have to worry about. Thats just me though, theres a lot of people that make it work for them, I'll stick with my B16a. I'd rather have an engine that if I want to I can beat up a little if I want and usually not have too much to worry about. Granted any engine you beat to crap is gonna break no matter what, but for what little hoarse power gains you get unless your car is strickly a drag car I would steer away for the whole Frankenstien thing. If someone else out there has done this and had really great results then let me know it just seem like too many problems to be really worth it.

i am one person that will tell you crvtec is definetly worth it. i ran a mid 13 with only bolt ons. i have had no problem with it. i've had it for about 6 months now and i beat the crap out of it every weekend, even driving to work is fun. theres not many cars out there that can beat a crvtec. i also got about 7 friends that have had theirs in their car for over a year some even run nos through it and they have not had any problems with it. but if your asking is it worth it, it is defintly worth it if power is what your looking for. and revs you dont even need to rev that high in this engine to get power out of if. my tires will spin pretty good when im in 2nd and all i do is floor it. i will get tire spin. my redline is at 8 and thats where i shift at. thats pretty good for me. why go higher if you dont even need to. i beat a gsr shifiting at 7,000 rpms he said he shifts at 8 1/2 so why go higher if you dont even need it in some cases with crvtec. just my opinion. i would difenitly pick crvtec.

I dont know where you guys think that the B20 out of the crv has no oil squirters....look at the rods its built into the side of the rods thats where it squirts the oil if you look closely you will see the little oil port on the side of the rod...i just finished building a CRVTEC for a EK and it revs to 8500 with no sweat all it has on it is a filter DC 4-1 and a 255lph fuel pump with B20 injectors and a B16a fuel rail and stock fuel pressure regulator.. If you want alot of low end torque and alot hp up in the top end do a crvtec only thing i have noticed is that the crvtec is missing mid range power but that could be to the fact this customer is using a stock cat and silencer and its dumped right after that. I mated this setup to a B16A trans very nice setup!

What about putting one oil line to each cylinder to act like the squirters? Just a thought. Not sure how it would work or if its even possilbe. The oil lines shouldn't be too large or you would drench the cylinders in too much oil( how much is enough oil anyway?)...any thoughts?

i gotta b2o in hatch and it flies! i got 12:5 JE pistons with stock b20 rods, with a jun lightened flywheel, a JG pro series head toda spec c cams which breathes through a set of individuals. my motor is very reliable no problems yet at least. my rpm can easily reach 10,ooo seriously! go with the b2o and kick some ass!

What about putting one oil line to each cylinder to act like the squirters? Just a thought. Not sure how it would work or if its even possilbe. The oil lines shouldn't be too large or you would drench the cylinders in too much oil( how much is enough oil anyway?)...any thoughts?
The oil line isn't for the damn cylinders, it is for the head.

how the hell are you supposed to get an oil line to each cylinder! the damn oil line is to engage the vtec, ls/vtec? duh!

The oil line isn't for the damn cylinders, it is for the head.

Argh!!! Forgive me for I have learned much more about vtec engines since then. Sorry :lol: .

So your saying that you have to drill holes in the b16 head and put oil lines in and stuff on a b20 block to supply oil (correct me if im wrong) to the bottom end for higher revs do to not having piston squirters??

So your saying that you have to drill holes in the b16 head and put oil lines in and stuff on a b20 block to supply oil (correct me if im wrong) to the bottom end for higher revs do to not having piston squirters??
No, the lines are there to supply the head, non vtec bottom ends don't support the oil passages, so you have reroute them.

ohh ok thanks i see now

so what is the best motor to use for a all motor 93 hatchback civic si dragster