im thinking about taking my built head and taking it off my 196K mile block in a few months and placing in a stock b20 block, how easy of a swap is it, will the compression stay the same or drop, i wanna keep my power all motor, i dont want pistons or anythng aftermarket on it, i like hjow stock honda stuff last so long, when u go aftermarket disaster can strike, how much a short block, motor mounts match? whats the hardest part, can i use my IM? please imform me
my head is as is…
5 angle valve job
feria 1mm oversized stainless steel valves,
port matched head
ported and polished
milled 30 over
crower titanium retainers
crower dual valve springs
i can start to sense my old block is going, please help about the b20
Yes its a pretty easy swap. I’m going to be doing the same in the near distant future.
Someone here on this board already did it and said it drops right in. Someone was also concerned with having to move the motor mounts, but YOU DON’T HAVE TO! It fits perfectly!
And you’ll be gettin 133 ft/lbs of torque! and depending on compression, 130ish whp. NICE!
The crvtec.com has a good site for information on the crv block. All the other info can be useful too, but you’ll see what will be involved with puttin the b20/b/z block and ur b18a/b head on.
Yeah everything should bolt up. Check the motor mounts though. I am now replacing them 1 by 1 and i should have done it while the motor was out. Anyway, 1 more thing is you should use your stock b18a crank pulley. The USDM b20 (dunno bout the JDM ones) have a slightly bigger crank pulley.
I read on crvtec.com that they liked to match port the combustion chamber to the 84mm of the block. Says it ruduces the possibility of detonation. They lose a bunch of cr tho, like .4 or somthing. But big deal with their high comp pistons going in. What i don’t get is the head gasket; it just uses the same gasket as the ls i understand. You’d have to enlarge the head gasket holes to benefit from the mod, the metal rim part. That sounds dangerous.
but on crvtec they are talking about putting a vtec head on the b20 block.
In our case, we are not putting a vtec head on the b20 blcok, just our original b18a/b head on the b20b/z block.
Again the b18a/b head is the SAME EXACT THING as the b20b/z head!!! The only difference is that the b20z has a tall IM that WILL NOT WORK cuz its too high.
You will use a regular b18a/b or b20b/z head gasket for this.
Anyone hear of using a b18 copper head gasket?? The copper is thinner, but I haven’t heard much about these. since they are thinner, they would increase CR sLIGHTY.
Again the b20 is the same thing as the b18 except that the b20 has a longer stroke, which increases the tq numbers. capiesh??
Originally posted by rcnacura Again the b20 is the same thing as the b18 except that the b20 has a longer stroke, which increases the tq numbers. capiesh??
Uhmmm, the stroke on the b20 and b18a/b are the same… no? Just the bore is different.
I’d have to assume that Honda knows what they’re doing when they put a smaller bore head on the larger block. It seems like they’re jsut cutting corners there to save on money, but they’re the experts. Perhaps they don’t account for this detonation possibility issue when the engine is built up, like with a b16a head and high comp. pistons. I sure don’t know.
Someone here on this board already did it and said it drops right in. Someone was also concerned with having to move the motor mounts, but YOU DON’T HAVE TO! It fits perfectly!
And you’ll be gettin 133 ft/lbs of torque! and depending on compression, 130ish whp. NICE!
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Actually, the mount that sits directly on the block on the drivers side, has to be changed to the one off the B18.
Its not really a big deal, but the timing belt cover has to come off, and its held on by three 14mm bolts.
Expect even more power from a healthy B20Z or jdm B20B.
that sounds like a fun swap- what about the oil pan-same as b18’s? if not what header to use, one for b20? would an ls trans be ok with that combination?(i know it would fit) what water pump/timing belt combo is used?
u guyz r idiots dont u kno that a b20 is a ls w/ a bigger bore??? waste all that time and money on a swap then to pull urz out n rebuild it which is better than buyin a swap then puttin it in est 1200 for b20 n 500 for labor… n wat do u gain??? can sumone answer that for me???
Originally posted by paz92ls that sounds like a fun swap- what about the oil pan-same as b18’s? if not what header to use, one for b20? would an ls trans be ok with that combination?(i know it would fit) what water pump/timing belt combo is used?
Don’t know about the oilpan, but your current LS header would work. The LS tranny would work fine also although a lot of people prefer a shorter geared tranny. I haven’t tried one yet on mine but would sure like to.
Originally posted by concacg2teg u guyz r idiots dont u kno that a b20 is a ls w/ a bigger bore??? waste all that time and money on a swap then to pull urz out n rebuild it which is better than buyin a swap then puttin it in est 1200 for b20 n 500 for labor… n wat do u gain??? can sumone answer that for me???
You say things like “u guyz r idiots dont u kno that a b20 is a ls w/ a bigger bore???” … n wat do u gain??? Nothing!!! Who says we don’t know what a b20 is? LOL! And for those who are asking… how are they supposed to know if they don’t ask?
yea a 98 crv, all im sayin iz that wouldnt it be worth it if u just build urself the engine that u have in ur car n be proud cuzz thats the motor that came out of it?? i kno cuzz my teg runs in the 14z and NO SWAP needed jus pullin it n werk wit wat u got. i got a swap on the side that im buildin( with the help on a friend of mine hea in kansas city) that is prob do alot better than me puttin out for a swap. for instance, the goin price on a geeser swap is wat???2700-3500 right?? do u kno wat the differance would be to put the same amount of money into ur current motor?? ne one else feel the same??? let me kno?? need ur blocc sleeved??? ill do it for u, but not for free. let me kno. wat kind of teg u got anyway jonsteR? n wats ur e.t.? wat mods?? holla back at yaz later… and as far as buildin a block wit aftermarket stuff isnt a problem itz the way the owner takez care of it, not over revvin n stuff. if u like the oem stuff u got options to go with itr or ctr pistons keep the rods have it balanced n dont forget since your their check all the bearings and all that good stuff. t belt upgraded oil pump and all the otha maint. things that will help the motor to last
Originally posted by concacg2teg u guyz r idiots dont u kno that a b20 is a ls w/ a bigger bore??? waste all that time and money on a swap then to pull urz out n rebuild it which is better than buyin a swap then puttin it in est 1200 for b20 n 500 for labor… n wat do u gain??? can sumone answer that for me???
You gain two tenths of a liter. More displacement means more torque, and torque is a good thing. Also, if you put the same amount of work into a B20 as you do a B18, I promise you the B20 will still be a better engine. Besides, the B20 is not “a ls with a bigger bore,” the cylinders are one-peice cast for more stength, which makes it a stronger block then the B18A/B engines. Then again, I wouldn’t expect someone who can not spell words such as “what”, “are”, and “you” properly to know something like that, much less be able to resleeve blocks.
