I have done searches and know generally what is involved to fit either into my 99 civic coupe EX. I just want your opinions on which you would go with.
I am not looking to be the fastest or anything, I just want something with more power for daily driving, so gas mileage and driveability would be the my top priorities.
I know that with the B20Z it will be a little bit more trouble and cost a little more to find the LS manifold and stuff, but I have also heard that the stock fuel pump will not be sufficient for the B20Z motor, and from what I have read on other sites it seems the B20Z would need a bit of tuning to get it running efficiently with the different ecu and stuff. Also how big a difference in gas mileage between the two motors, both using the LS tranny?
I would do the basic i/h/e with either and not much more than that.

Someone shed some light on this please.

 

b20z is little more torquey and powerful then the LS.
stock pump/injectors and LS ecu is more then fine. gas mileage is identical, reliability is on par. personally I recommend to go with GSR or SiR or even ITR tranny. this way you can have something thats rather quick and always in the powerband.

 

I have actually had both motors in my Civic HB. And all I can say is that the B20 is WORLDS better. At least in my case, there was no comparison. By the way, the transmission was the same in both cases - a 1993 LS YS1. As for fuel economy, the B20Z actually seems to have a slight advantage (although one would think it shouldn't). Maybe it is that 9.6:1 compression ratio (compared to 9.2:1 for the B18B).

So definitely do the B20. It has been a GREAT motor for me. Torque is great. Fuel economy is good. Freeway RPMs are not insane. And the motor can actually pull those tall LS gears.

 

i would go with the b20 its stronger the head flows better than a port/pol b 18 head go with the b 16 tranny and you will love it you may want to put a ls 5th gear in so you can cruise on the highway about 80mph in 5th you will be around 4200-4500

 

i would go with the b20 its stronger the head flows better than a port/pol b 18 head go with the b 16 tranny and you will love it you may want to put a ls 5th gear in so you can cruise on the highway about 80mph in 5th you will be around 4200-4500

 

which b20 should be used, i know theres one with 126 hp and another with 146, or will they both be the same? im not sure. thanx

 

Not hard at all to find a LS intake manifold! I've got one, hit me up if you're interested!

 

Go with the B20Z 146 hp if you're just gonna put bolt-ons on it.

 

oh *sigh*

first off
the 96-98 b20b's have 20 less hp.
they are 126hp, they DONT have an identical head to a LS motor.
It has .3mm less lift on the intake cam! NOT THE SAME HEAD
SHITTY compression 8.8:1 stupid P3F pistons.
Find a 99-00 JDM b20b or USDM b20z, they are the same thing. phk pistons p75 cams.

For anyone that feels otherwise...
pictures always help.


Factory Knock

JDM b20B

PHK pistons, not p3f's

Now for the head-

P75 cams...

Just got sick of the rumors....

anyone that says otherwise is an idiot.

96-98 B20B's in japan and US are pretty much the same, they ahve the same rated specs, cept for some have the p75 intake manafold, I dunno why, I dunno exactly which ones, but ive seen quite a few. So from what IVE seen, there are 3 types, the P3f intake manafold the P75 manafold and the P75 manafold is found on the 99-00 cept with the resinator box thinggy on top with a big hole in the manafold for it.


99-00 B20B in japan and B20Z in the US are also the same, come with factory knock, and have the air chamber.

Now, if you want, you CAN find JDM b20b's WITH P75 (b18b) intake manafolds, but not the 99-00 B20B's

Anyone that tells you otherwise is retarded.

 

obviously a dumbass
with my JDM b16 YS1 short as **** tranny, I cruise at 80mph at 4500 RPM
The b20 head's castings are identical, only difference is the cams on the 96-98 spec.

 

For ECU, use a obd-2 LS ecu, rather easy to find since everyone goes with obd-1 that does upgrades to their ecu, IE hondata.
You dont need to do anything special, its just a damn LS motor, u can run a DX ecu if u want, actually makes more top end power then a LS ECU (JUST top end, the rest sucks)

Gasmilage rocks, expect to get about 32-38 depending on how u drive, worse if u have a heavy foot.
You'll love the power on a b18 or b20
b20 has more torque and more hp
and b20 responds a lil better to bolt-ons because of bigger displacement.

Okay, I think ive answer'd all the questions, ill stop posting after post now.

 

Finally! Someone who knows thier ****! AMEN to you brother!

 

Also keep in mind that the low rated power outputs of the B20 are in their stock, strangled state. This may make it look like the B20 is a bad choice compared to the B18B. But it is not so. Even if you just use a stock 1994-1995 LS intake manifold assembly, 1994-1995 LS exhaust manifold/downpipe, and 1994-1995 LS ECU, power output will be considerably higher than the stock ratings. With good bolt-ons, wheel HP will be approximately the same as the rated crankshaft HP on the B20.