willyboyK20

I know the b20 will make more power but i wanted to know around how much more. with both blocks just having ctr pistons and a b16 head, stock cams, ecu, etc, how much hp to the wheels would either engine make

if anyone knows can u post up some numbers. thanks.

tinkerbell

how r you using ctr pistons?

are you using a B20A block?



[Modified by tinkerbell, 12:57 PM 4/14/2002]

CRX_VTEC

What kinda CTR pistons fit in a B20????

B16CRX

They don't. B20 is 84mm bore. All other Bseries are 81mm.
Just won't work.

tinkerbell

the B20A has a 81mm bore...

B16CRX

True, I was just assuming it was B20B or B20Z if it was for B20VTEC.

willyboyK20

i mentioned the ctr pistons because a website i visted said they could machine the block to accept the ctr bigger pistons

tinkerbell

we seem to have a breakdown in understanding here.

teh ctr pistons are SMALLER than the B20B pistons.

the ctr pistons are suited for an 81mm bore, teh B20B/Z has a bore of 84mm.

hence more displacement and potential for power...

t..

RexB16

b18 and b20 blocks are the same, so theoretically a b18 could put out just as much power with a wee bit 'o machine work.

RexB16

and i have some#'s for you

two friends:

ls/vtec
b16 head
ctr cams
itr intake mani
dc header
b16 pistons

178 whp (no tuning)

b20/vtec
b16head
port/polish head
ctr cams
jdm itr header
stock block
174 whp (no tuning) 191 whp after vafc and tuning (no additional mods)

CRX_VTEC

the major difference is in the torque the B20 has.

Finest

Resleeve the B18 to 84mm and you have a B20.

So if you're staying N/A, go with the B20 since it has a big bore...and I don't see a need to resleeve if you're just going with bolt ons. But if you're planning on FI in the future, and planning on boosting 10-20psi, then you'll need to resleeve anyways. The B18b is plentiful and cheap, so you can find one really cheap and resleeve that to 84mm. Same as if you would resleeve a B20 to stock bore. Starting with a B18b block would save you a few bucks down the road.

tinkerbell

doesnt the B20 have different jackets?

the one piece design?

correct me if im wrong, but that is the major advantage of the B20,

it is stronger than all other B series blocks?

otherwise we could all just bore our B16's to 84mm?

a B18 block bored to 84mm would NOT be as strong as a stock B20...

t..

from_zer0

Too lazy to check the facts, but...

I believe the b20 does have a different setup. It's cast so that there's one piece for the 4 cylinders vs. individual cylinder sleeves or something like that. (This is all what I recall, and theory, I've never personally dealt w/it) Basically it's more solid and better at dispersing heat.

Can't remeber exact #s, but someone mentioned HP figures for a LS-V vs. CRVTEC...What were the TQ #s ? Just curious...for instance, a cammed, modded b16 against a LS-V of the same, the 1.8 was putting out 10 more HP, but 30+ TQ!
That's gonna make quite a bit of difference in the 2 motors, even though they're only ~.2L difference in displacement.

Just trying to chime in and maybe contribute something useful. Why NOT go with more displacement in the SAME block? Gotta love the B-series motors, gotta hate the lack of TQ. Here's the solution.

Oh, and to answer the original Q about HP/TQ #s, just from a few dynos I've looked over the 1.8 averages 130-140 TQ to the wheels whereas the the 2.0 motors are more around 155-160 @ the wheels. Hosepower as low as 175ish up to 230+ for the 1.8, the 2.0 motors are consistently in the 200+ WHP range, up to the 240+ area. These are just guesstimates, anyone wanna add/subtract anything?

Thanks for your time.


[Modified by from_zer0, 2:30 AM 4/16/2002]

silver89civic

What about turbo? Which one is better B20B or B18B?? Would you put some specifications?
I mean to get to do 10secs on a 1/4 mile with a 4g, and is it true that the B20B is more expensive? Cuz one shop quoted me $3000 to do a full swap of a B20B.

Finest

That sounds about right. I've seen some with less, but on the average around that ballpark. Remember, 200hp/150lbs is right around the H22a's numbers, just something to think about...

Maximus

The prelude motor weighs more than b series motors. As the saying goes theres no replacement for displacement. If there was a test between a b18 and b20 both moded the same way the b20 will win.


[Modified by Maximus, 7:23 PM 4/16/2002]