civic type r pistons in ls b18a
 

hey guys, hoping on building an all motor b18a ls for my crx. the head is already built, just wanted to get some high compression. was wondering if i would have any problems putting in b16b civic type r pistons with a ls head. thanks

Re:civic type r pistons in ls b18a
 

na, that would be fine, but what is the cr on those? why don't you get some itr's instead ???

Re:civic type r pistons in ls b18a
 

i've heard ctr's give you around 11.4 compression because of the higher dome whereas jdm itr's give you around 10.8. so i figured going with the ctr's instead..

Re:civic type r pistons in ls b18a
 

wait im confused...I thought the b18 was 1.8L and the b16 was 1.6L,so how are u gonna put 1.6L pistons in a 1.8 block? ??? aint they gonna be too small?Maybe this is just a stupid question. :-X

Re:civic type r pistons in ls b18a
 

b series pistons are interchangeable, it's the crank and rods (stroke) that make a 1.6 and 1.8 different.......

Re:civic type r pistons in ls b18a
 

1.6l = blah, normal
1.8l = stroked 1.6l
2.0l = bored 1.8l

Re:civic type r pistons in ls b18a
 

yup

Re:civic type r pistons in ls b18a
 

I would go with some ITR or second Gen B16 pistons since they are a little lower for street driving. Plus if you add a Vtec head or need to shave the head in the future the CTR pistons will have a really high cpr. But it all depends on what kind of gas and tunning, bigger cams would like the high cpr with the Ctr's pistons. just my oppinion though.
steve

Re:civic type r pistons in ls b18a
 

how much are the pistons would it be cheaper to buy forged pistons srp

Re:civic type r pistons in ls b18a
 

i think they're a little less than most forged pistons. i think you can usually get a new oem set for under 300......

Re:civic type r pistons in ls b18a
 

get measurements first, i think there might be a problem w/ the wrist pins.

Re:civic type r pistons in ls b18a
 

Out of topic but have you thought of a b20 crank in there. What kind of head are you using ( the oon that is built already)?

Re:civic type r pistons in ls b18a
 

b20 crank would have no benifit

Re:civic type r pistons in ls b18a
 

aren't they exactly the same ???

Re:civic type r pistons in ls b18a
 

EXACTLY the same, maybe not, but they have the same stroke so there would be no point.

Re:civic type r pistons in ls b18a
 

i'm using an ls head. im not sure as to where im going yet, it's either those ctr's if they fit or some itr's and hittin it with a 50 shot.

Re:civic type r pistons in ls b18a
 

B Series Compression Calculator:
http://www.c-speedracing.com/howto/c...c/compcalc.php

i wouldn't go higher than 12:1 on a street car.... but that's just me.

Re:civic type r pistons in ls b18a
 

I cant vouch for CTR pistons on LS rods, but I recently stuffed US ITR pistons on B16 rods, and they required some 'work' to fit. The wrist pin area of the piston is just a twat hair too small for the B16 rods. I had to have a very small ammount of material machined from the pistons.

I dont know for sure, but Im pretty certain that if ITR's dont fit then CTR's wont either.

Anyone know for sure?

Re:civic type r pistons in ls b18a
 

yeah you have to get that machined or it doesnt fit at all. if your gonna stay with an ls get the ctr pistons but if your gonna go ls/vtec get the itr's cause the ctr's would give u a really high cr. which isnt very good for a daily driver. you'd hurt that thing driving it around unless u were on some really high octane. but yeah just my .02 cents

Re:civic type r pistons in ls b18a
 

those pistons give those compressions in their own respective engines. i don't have those engines, i have an ls. if you saw the link earlier, you would have seen that i have an ls, and putting itr's in would give me a 10.8 compression, and ctr's would give me 11.4 compression because of the higher dome (using the compression calculater). the guys before me know what they're talking about.

Re:civic type r pistons in ls b18a
 

yeah the itr's have a lower compression ratio than ctr's. thats why some people put ctr piston's into an itr motor. i dont know though i think shawn hillier did it to his ek.