Smash03

I've searched the forums but I only came up on info about the B20B. I just wanted to know the different specs between the two and which one is better to build.

rex_racer728

b20z would be the way to go. It has higher compression than the b20b. I think the b20b is 8:8:1 and the b20z is 9:6:1.If your going all out for a sleeved high compression motor either one will work fine. But I have a stock b20z bottom end with a stock GSR head and b16 tranny in a 1994 integra LS and I got it to run 14.2 before the LSD. Hope this helps!!!

FATBOYeg6

where are you guys getting your b20z's? i can't find one anywhere.

daver

look into a jdm '99+ b20b then, should be the same.

d

JCushing

https://honda-tech.com/zerothread?id=1467903

Smash03

Thanks for all the info.

Smash03

By the way, what's the rev limit or redline on the B20's?

JCushing

from personal experiance, 6500 on the b20b and 7k on the b20z. mostly due to cams but im sure you know that cause it was on the link i posted.

daver

http://hybrid2.honda-perf.org/....html

usdm b20b redline- 6200rpms
b20z - 6700rpms

i'm sure the b20b limitation is mainly the giraffe intake.

d

ABK

there are 3 different version of b20bs. People just always think they are shitty.

1 with p75 head is 8.8:1 compression (the worst)
2 with pr8 head is 9.2:1 compression.
3 with pr8 head and knock sensor (99-01) has 9.6:1 compression just like b20z.

JCushing

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daver &raquo;</TD></TR><TR><TD CLASS="quote">
i'm sure the b20b limitation is mainly the giraffe intake.

d</TD></TR></TABLE>

im sure its mainly the cams, b20b only has 8.9mm lift on the intake cam.... ive had both motors both with a skunk2 intake, the b20b dies hard after 6500, the b20z pulls fine to 7k

ABK

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JCushing &raquo;</TD></TR><TR><TD CLASS="quote">

im sure its mainly the cams, b20b only has 8.9mm lift on the intake cam.... ive had both motors both with a skunk2 intake, the b20b dies hard after 6500, the b20z pulls fine to 7k</TD></TR></TABLE>

yeah I believe that all b20s came with shitty cams, not depending on compression or head. My friends b20 with pr8 head falls on it's face after 6500 with LS intake matifold.

JCushing

no actually the b20z comes with b18b cams, and b20b's come with a weak 8.9mm lift cam. i have a set of p8r cams that i havent measured yet though so i dunno about them.

ABK

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JCushing &raquo;</TD></TR><TR><TD CLASS="quote">no actually the b20z comes with b18b cams, and b20b's come with a weak 8.9mm lift cam. i have a set of p8r cams that i havent measured yet though so i dunno about them.</TD></TR></TABLE>

Yeah I'm waiting until I get a pr8 head so I can measure them and compare to my p75 cams.

daver

well, providing you didn't have a dud b20b, i'll have to go with your experience.

Do the b20 cams have stamped numbers on them to differentiate? I looked at mine once to see what cams i had, but i can't remember what i cam up with.

d

daver

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ABK &raquo;</TD></TR><TR><TD CLASS="quote">

yeah I believe that all b20s came with shitty cams, not depending on compression or head. My friends b20 with pr8 head falls on it's face after 6500 with LS intake matifold.</TD></TR></TABLE>

don't b18b's fall on their faces their as well?

daver

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ABK &raquo;</TD></TR><TR><TD CLASS="quote">there are 3 different version of b20bs. People just always think they are shitty.

1 with p75 head is 8.8:1 compression (the worst)
2 with pr8 head is 9.2:1 compression.
3 with pr8 head and knock sensor (99-01) has 9.6:1 compression just like b20z.</TD></TR></TABLE>

are you saying that my p75-5 headed b20b has no chance of the 9.2:1 cr? i was fairly convinced it has the two layer gasket (without taking it off).

All i know is it pulls pretty good to redline on my obd1 auto trannied GS, even with stock exhaust. Switching back to the stock ls manifold from the low rise b20b mani (that came with my b20, with a 60mm throttle body), really knocked off some of its midrange surge tho. I don't think it felt as strong running obd0, even though i once broke loose from a rolling start when it was in my '90 RS.

In other words, when i popped the b20 in my 1990 RS integra, it wasn't a huge difference (mid 16's). When i popped it in my '92 auto, it made the old engine feel like a d15. Stock exhaust on both cars tho, and the old '90 ls had an extra 150kkms on it to boot).

I'll get a pic up showing the difference in port size from the G2 ls intake mani and this b20 one, if anyone is interested.

d

ABK

b20b with p75 will still make more power and torque then LS.
I'm just writting what I read. You can find most of this info if you go on japanese honda website, translating with altavista.com. I didn't get this info but someone else on this board.

fmrprojects

get the b20b 99-01. i just did a swap 2 days ago for a friend and that **** is quick. its bone stock with a 6 puck act and b16 tranny. it pulls harder than my other friends stock gsr in a hatch

daver

i actually did go to the japanese honda website prolly 3-4 years ago and i was copying out the b20 specs and posting them online at the time haha.

I never came to the comclusion tho, which vehicle my b20 actually came from. the low rise "ls" style intake manifold and the 60mm TB are its defining factor ('96). So i'm thinking orthia.

The other weird thing i don't undersatnd is you guys are saying the p8r head , that comes with the 33mm valves, 9.2:1 cr, is showing up with the giraffe style intake manifold (which supposedly has a 56mm throttle body according to my research).

https://honda-tech.com/zerothre...96110

That intake system is designed for low mid power gains, what's with the vtec valves?

d

JCushing

all ls cams have P75 stamped on them..... all i can measure is lift, i heard cough cough internet rumor that b20z cams have more duration than b18b cams however the both have the same lift..

for reference since no one is reading the FAQ heres intake cam lift

b20b cams 8.9mm lift
b20Z/b18b cams 10.0mm lift
crower 403's 10.7mm lift
crower 404's 11.3mm lift

once i get my caliper back ill measure my P8R cams for reference too

add this into the fact that the b20b has less than 9:1 its gonna fall on its *** at higher rpms, NOW swap in a skunk2 intake mani or even an LS, put in b20z pistons and b20z cams and youll be a whole lot better...

to illustrate my bone stock b20b in my DC4 with NO boltons even the stock paper integra air filter stock exhaust everything made 112hp... prolly coulda squeezed out 120 with bolt ons

i estimate my stock b20z with bolt ons to have made 140-145 hp (skunk IM, I,H,E)
i base this off my dyno with 404 cams were i made 165hp... i figure the cams added 20-25hp...

ive seen other b20z's put down 140-145 with bolt ons too....

daver

yes, i've been continually impressed by the good $$ vs. performance out of the b20 engines. It my main recomendation for a swap, especially people with integras.

Once at the strip, i raced a guy who had a 5g civic sedan (mostly stripped tho), 4-1 header, 2.5" exhaust, b20b with ls cams he said. In my civic (sig) i only beat him by a couple lengths. Barely even pulled on him. I had a more lousy 14.4 run that time, and he landed a 14.7. i'm sure he could have managed better numbers too tho. cheap power, just a little more hassle to get the ls parts.

d

daver

so basically, all cams are stamped the same as their respective heads?

d

JCushing

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daver &raquo;</TD></TR><TR><TD CLASS="quote">

The other weird thing i don't undersatnd is you guys are saying the p8r head , that comes with the 33mm valves, 9.2:1 cr, is showing up with the giraffe style intake manifold (which supposedly has a 56mm throttle body according to my research).

https://honda-tech.com/zerothre...96110

That intake system is designed for low mid power gains, what's with the vtec valves?

d</TD></TR></TABLE>

NO research ive done has made sense regarding the P8R, it HAS a 47cc combustion chamber, i measured mine.. and is listed as having a 9.2:1 cr with p3f pistons... i just dont fing get it... thats not possible.. the 2 layer gasket doesnt make sense either sine it wont raise CR from 8.8-9.2. no numbers add up and nothing makes sense.

i also have no clue why they put the vtec size valves in there, although if you compare power output it KINDA makes sense... they wanted a few more ponies in the b20b motors without using the higher cr pistons they used in the later years... in japan the p8r head b20b's are rated real close in power to the b20b with phk pistons

uncontrolled515

go with the B20Z with a B16 head put gsr or type r CAMS AND VALVE TRAIN arp head studs get a JDM GSR ECU any tranny of choice but only rev to like 7200 cause with out upgrading the stock rods you will mostlikly break a rod at that high of a rev, get H.I.E. and a good set of tires and you could pull better then a 14.5 pending on the driver, ive seen that setup which the GSR cams cause its in my car now going 14.00 in a integra i havent taken it to the track in my civic yet