b20/vtec hybrid questions

[OneSikCRX]

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

[OneSikCRX]

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

[zippeay]

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

[Jetts]

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

[OneSikCRX]

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.

[Jetts]

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

[edman24]

ive heard from many sources that you cant use the old prelude Si b20. but they may be wrong i guess 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.

[zippeay]

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

[OneSikCRX]

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

[OneSikCRX]

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

[jcrx]

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.

[OneSikCRX]

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

[edman24]

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

[zippeay]

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

[edman24]

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.