EG6 Civic

im putting together a B20 vtec i wanna know what all i am going to need for the swap like a parts list of some kind, and to get it to be reliable.

and what do i do about the PCV Valve?

Slo_crx1

Bottom end-wise will probably be just like beefing up a b18, more than likely would replace the rod bolts and such, and see about bumping the pressure up in the oil pump. As far as conversion-wise goes, I'd probably get one of the Golden Eagle kits that supplies everything in it, especially dealing with the larger bore size. As far as a pcv setup, I doubt you'll have to worry about that once you swap a vtec head on...the pcv setup comes off the intake manifold. Otherwise if it's a straight up b20 you'd need to swap on a b18a1/b1 intake manifold. Another warning too...b20 sleeves are thin, so big boost is out of the question without a sleeving job.
A torque monster no doubt, but without proper research and knowledge your project can turn into a nightmare very quickly imo.

sandman

alot of reading but also alot of help... http://board.hondacrx.co.uk/phpBB2/v...ic.php?t=43258

crx304

make it reliable? just buy a different motor.... like SLO said.... ur gonna have 2000+ into sleeves/pistons/rods/bolts.... etc... just buy a B16. it has a perfect R/S ratio. so you can rev the **** outta it

EG6 Civic

ok, well if i build the bottom end like do pistons, rods will it be safe to run like 5-8 psi with a s300 and tune

Slo_crx1

It's probably possible, but like I said earlier...thin sleeves. They don't seem to like boost much at all. Read Joseph Davis's post that's sticky'd at the top of the hybrid/tech section here on honda sleeve info...it explains what's going on with b20 sleeves. Not to mention that you'll have to find someone who makes pistons for a b20, seeing that they're an 84mm instead of 81mm. IMO it'll probably be cheaper and easier to put together a b18 bottom end and just run an ls/vtec. Here's a few specs on block heights, stroke, and bore size for you...
B16a=81mm bore 77.4mm stroke 203.25 mm deck height
b20b=84mm bore 89mm stroke 211.84 deck height
b18b=81mm bore 89mm stroke 211.84 deck height
b18c(GSR)=81mm bore 87.20 stroke 212.39 deck height
Pretty much is just a bored out b18 block that's good for all-motor, not much else.

reactone

I thought I once read here that the R/S ratio is worse than LS/Vtec setups as well. I might be wrong though.

Slo_crx1

Nope...exact same stroke as an LS. That's why n/a guys love the b20's...same shitty r/s ratio as b18a1/b1's (for lots of low end grunt) with the additional displacement. In the n/a world, there is no replacement for displacement.

EG6 Civic

i heard that the b20 sleeves can handle small amount of boost but they say tune it and it will be fine, and this is coming form people that have B20 vtecs running 8-10 psi on stock sleeves and its been working fine for over a year or more but i fugure if i run low amounts of boost like 5-7 psi and do one bad as# tune it will be fine, but ill run N/A for a little while to see how i like it if not ill turbo it.

Tom-Guy

1.52:1? That would be LS bottom end, and, yes, you can rev the **** out of them.