ls b18b or crv b20z ????

koo · 08-17-2002, 05:29 AM

i need alot of help on this one. i am planning to buy motor for my EK but dont know which one to buy. i am also gonna go turbo. im heading towards the b20z cause of the torque and low compression. i am not gonna go ls/vtec or crvtec cause i heard it not reliable to frankestein. should i get a ls tranny, gsr, or itr for my b20z. i am going for fast but daily driven also...i know more power means more fuel..but i dont want my car to be a gas guzzler so help me on this one guys.

5_LiTeR_EaTeR · 08-18-2002, 10:55 PM

you are right LS/vtec or CR-Vtec isn't that reliable. I think in the long run you would want the b20 because there is of the more displacement and would be a better platform to work with. and since the lower compression you can put more boost up to it. I would just rather put lower compression pistons in it aways. the reason why its compression is lower is becuase of the stroke, but if you dont want to build the bottom end then get the b20. I would suggest you build the bottom end while you got the motor out of the car. New headgasket, timing belt water pump and tune up etc should go with as well. I hope that gives you a second opinion and good luck with your swap!

~Alex~

koo · 08-19-2002, 01:52 AM

but should i go...ls trannny,gsr,or b16????

Jeffbunge · 08-19-2002, 10:38 AM

I know for sure a GSR would work (and work well) and LS or ITR tranny would also work, dunno about the b16. Just depends on how close you want the gears. If your really ambitous, you can take a close ratio tranny (like ITR) and the 5th gear from an LS so your not running at 5K on the highway.

Check www.crvtec.com I know you don't want a crvtec, but they have good tranny info.

GSteg · 08-20-2002, 12:09 PM

just to clear things up...

B18B- 9.2:1 compression
B20Z- 9.6:1 compression

tenzoracerevovii · 08-28-2002, 04:54 AM

i think the b20b has 8.8 c/r. the thing is the b20 has a better block design than the b18 so it should be more reliable for boost. also the larger displacement doesn't hurt either.....

GSteg · 08-28-2002, 11:16 PM

personally..the way i think to do is a little more expensive than the B20Z itself.

my plan is to get a B18b engine and get the block resleeved so the 84mm pistons would fit in the engine perfectly. the end result is that you get a 2.0 liter engine, just like the B20 engine. now why would i go through all this trouble just to do this? well for 2 reasons. in cali, i can't swap the B20 (light truck) in a car chassis. by boring the B18 out to 2.0, i get similar performance (with more hp) than the stock B20Z. no cops are going to rip open the block just to measure if it's a 1.8 or a 2.0 engine.

second reason, honda 4 cylinder engines make their power through revving. not displacement like other cars. so when increasing the rev limiter, you create more power under the powerband. but why can't i just raise the limiter on the B20? simple. the B20 engine utilizes a poor rod to stroke ratio.the lower the r/s number, the less it can rev safely. the LS engine has a higher rod to stroke ratio, hencing it can rev a little higher than a B20 will ever get.

Sulsa · 08-30-2002, 05:30 AM

1.75:1 is often refered to as the perfect ratio. From what I've read, they both have a bad ratio, (the same one)!

"B18A-B; B20B-Z:
Rod length: 137mm
Stroke: 89mm
R/S: 1.54:1
Displacement: 1834.47 cc"

Taken from:

http://pub72.ezboard.com/funleadedra...icID=775.topic

This guy posted a lot of good info.

Tominos · 09-02-2002, 01:23 AM

quote: my plan is to get a B18b engine and get the block resleeved so the 84mm pistons would fit in the engine perfectly. the end result is that you get a 2.0 liter engine, just like the B20 engine. now why would i go through all this trouble just to do this? well for 2 reasons. in cali, i can't swap the B20 (light truck) in a car chassis. by boring the B18 out to 2.0, i get similar performance (with more hp) than the stock B20Z. no cops are going to rip open the block just to measure if it's a 1.8 or a 2.0 engine.

from what i've read on crvtec.com, they advise not to bore out the b18b that much because boring out too much will make the cylinder walls unstable and flex under high hp applications right? i get what you're saying about the light truck engine in a car chassis. i never knew about that.

ApexAvenger · 10-11-2002, 01:16 AM

I'm looking to take a 92 Civic Hatch and drop in either a B20 with a Si head or just a straight B16A engine. Which should I go with and why? I know the B20 will push more hp but the cost is the only issue.

Sulsa · 10-11-2002, 05:04 AM

I think you just answered your own question.

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