I am still debating to get either a B20Z or B18C

So far I am more and more leaning towards the B18B because of the aftermaket parts you can use with this and the fact it is very affordable...

I have only one major questions regarding pistons...I want to use CTR pistons on the B18C? Will that work on a non-vtec application?

What I dont understand as well, is what are the benefits with .25 mm over? and what is that refering to and what does that mean...(yes I am new and clueless )

which one do I use with the B18C? .25mm or no .25mm?

what grade of gas is to be used with this thing as well?
of course typical question is power expected...? would it better than a B20Z?

 

i think i may be able to answer a few of those but im not for sure so someone correct if i am wrong...

im not sure about the pistons in a non vtec block

benefits of .25 over is the piston has i higher dome and creates more compression

you can use either standard or .25 over in a b18c depends on how high you want the compression...although with the .25 over you will have to do some modification to make the pistons fit

ctr pistons make pretty high compression...if you are running standard pistons with a standard headgasket that will put you at about 12.4ish:1...at the least i think you will need 93 octane maybe 94...power will be gained im not well informed on the b20z though so im not sure

hope i helped you a little dont take just my word though...if im wrong please correct me

 

they will work in a b18b block, as long as you dont mill the head too much, or the top of the pistons will contat the valves and goodbye motor

.25 over has nothing to do with the compresion, it is a biger diameter piston, meaning that the sleaves in the block will need to be borred larger, this gives you added displacement

and yes these pistons in an ls motor will make the compression a little high, but can be fine with some good tuning

 

How about running either GSR or ITR pistions

or is that just the same thing?

 

actually, CTR pistons in a straight b18a/b motor will come out to about 11.5:1
US GSR will be around 9.7 and US ITR will be around 10.2

 

CTR pistons in a LS motor.. ---->

 

Damn what a hard decision

to put CTR Pistons or should I just stick with USDM Type R pistons

whats the difference other than compression ratio?

another thing that scares me is milling of the head...is that necessary with CTR pistons..because if thats the case then I would rather choose USDM Type R pistions

and spend more on the CAMS!!

what to do???

 

B18C is always better . Frankinstein setup are not reliable for long term revving.

About OS pistons , OS 0.25 will raises your CR by 0.1 and reasons for OS is when you have score on the cylinder sleeve then you have to bore or hone it a bit to fit a slight bigger piston. Performance gains is very minimal.

 

If it aint that much, then I may just stick with USDM ITR Pistons..

but wait...does the JDM B18C (non-vtec) motor have different types of pistons?

 

usdm itr sluggs in my baby.one the best modds i ever gave her.im right around 10.5 but i wish i had gone a little higher

 

CTR in a LS should be about 12.0:1 compression...