im in the process of building my b18b up, im using pr3 b16 pistons, i was told i'd be running 11.1.1 compression in my ls is this right? im having my stock rods shot peened, arp rod bolts, head studs, and balanced crank, now i was doing some reading and some people were saying that higher compression makes it harder to pass emmisions, before i started the build up i took my car to pass the smog test and i failed. i was running stock motor w/ Crower 404's and a Dc 4-1 header w/ stock exhaust. when im done with the build up, im sticking in the stock ls cams in there till i break in my motor, so my question is, what do you think if i will be able to pass the smog test with 11.1.1 compression? everything else is stock besides my header? thanks

 

Don't believe everything you read! Put the Crowers in there and break it in.... you'll be fine. You need to break it in slowly and gradually no matter what cams so you might as well break it in since the new cams need to be broken in too, so you might as well do them all together. Emissions shouldn't be a problem so long as you have good control. That means ECU mod somehow. I have 12.0:1, ITR cams and just recently passed emissions in MA without a problem Yoshio-chipped ECU and VAFC supplement. Better dump that stock exhaust too!

 

no the thing is i failed smog w/ the 404's. and there already broken in i've had em in for a wonderful 2k miles, just curious if the higher compression make it alot harder to pass smog, thanks for the input

 

Should not make it any harder. Look at the S2000, Celica GTS and so on, all run 11.0+ and pass just fine.


Jason

 

which part did you fail?

 

yeah, in VA there are various facets to emissions, 3 in fact, but i can't remember what they are (carbon monoxide, something, and something)

 

This guy is non-vtec though, right? S2000, GTS, have some sort of vtec which use valve overlap as Exhaust Gas Recirculation (EGR).

Higher compression will increase cylinder temps and produce higher nox levels compared to stock.This is probably why you will fail.