b18 bored .40 over=?

[clumsy_smurf]

what does a b18 bored .40 over equal to? will stock b20 pistons drop in? if not what pistons will i need for this motor?

[Bacon]

.20 over is about 1mm if I am not mistaking. B20s are about .60 over from an LS.

[EmminoDaGreat]

.40 is 82 mm so no b20 piston will not work, you would need 84mm.

[clumsy_smurf]

sweet, thanks guys for the help

[Bacon]

No problem.

[clumsy_smurf]

so would these work?
http://www.jepistons.com/Catalogs/SRP/Honda-Acura/b20_b16a.aspx

[RBS]

no, those are all 84+ mm pistons

[Bacon]

.40 over is an 83mm bore.

[clumsy_smurf]

oh emmino told me i needed 84mm. so bacon, i need 83mm correct?

[Bacon]

He would know more than I would but if I wasn't mistaken, .20 over for every 1mm.

[clumsy_smurf]

man this is confusing me lol. ive been researching but i cant seem to understand the numbers

[Bacon]

81mm bore is stock LS
84mm bore is stock B20

I am under the impression that .20 is equivalent to 1mm which would make:

~.20 = 82mm
~.40 = 83mm
~.60 = 84mm

Like I mentioned before, Emmino would know it better than I would.

[clumsy_smurf]

see thats the info ive been trying to get. i mean it sounds about right to me but ill wait to see if Emmino will confirm that its right i guess before i order the wrong pistons

[Bacon]

Is the block you are working with already bored out?

[clumsy_smurf]

yea its bored out and he said dual sleeved? i havent bought it yet cuz im researching about pistons for it.

[Bacon]

Dual sleeved? Not sure what that could be. Maybe Dart sleeved :dunno:

[clumsy_smurf]

idk to be honest lol. maybe dart sleeved. ive never seen the block, my buddy told me about it.

[clumsy_smurf]

im just trying to figure out what piston mm this block is

[Bacon]

http://www.honda-tech.com/showthread.php?t=1417976

Emmino was right. My lack of knowledge in that field is retracted.

[DarKStaR]

.20=81.5mm
.40=82mm

[Black4DrEK]

81mm bore is stock LS
84mm bore is stock B20

I am under the impression that .20 is equivalent to 1mm which would make:

~.20 = 82mm
~.40 = 83mm
~.60 = 84mm

Like I mentioned before, Emmino would know it better than I would.

That is wrong bud...

.20 over is 81.5mm
.40 over is 82 mm

[Black4DrEK]

.20=81.5mm
.40=82mm



haha.,. damn

[DarKStaR]

I found out the hard way a few years ago... lol

[clumsy_smurf]

ok so if emmino says i need 84mm, isnt the stock b20 bore 84mm? i couldnt just take my b20 pistons and drop them in?

[Black4DrEK]

I found out the hard way a few years ago... lol


Me too.. Had a B16 (didnt know it was 81.5) Had some 81 mm CTR pistons for it.. Well yea.. while putting it together found out..

[Black4DrEK]

ok so if emmino says i need 84mm, isnt the stock b20 bore 84mm? i couldnt just take my b20 pistons and drop them in?

What size is the block NOW?? Stock, or it has been bored already?

If its bored already.. then you need pistons for that bore

[Bacon]

That is wrong bud...

.20 over is 81.5mm
.40 over is 82 mm

Reading owns you. See my last post where I corrected my mistake.

[clumsy_smurf]

the b18 block has already been bored and sleeved. the only thing the guy told me was that is a b18b1 bored .40 over

[DarKStaR]

how about get someone to mic it out so you will know exactly what size it is?

[clumsy_smurf]

because no one around here is smart enough for that haha.

[Bacon]

Take someone with you when you go to buy it. Have that person measure the bore and see what exactly it is.

If it's 82mm, it should measure 3.2283464566964 roughly.

What side of town are you on? Regardless of the current bore size, if it is .040 over you still have a little room to play with if need be.

[Black4DrEK]

how about get someone to mic it out so you will know exactly what size it is?


x2,, Take it to a Local machine shop.. and they can easily tell you..

hell you could do it with a damn Micrometer if need be

[EmminoDaGreat]

holy fuck, 39 replies and I answered the question in the second post. lol.

[clumsy_smurf]

i live in columbus ga. and im jsut going to take it to a shop and get them to mic it out. seems like itd be way easier that way lol

[DarKStaR]

Take someone with you when you go to buy it. Have that person measure the bore and see what exactly it is.

If it's 82mm, it should measure 3.2283464566964 roughly.

What side of town are you on? Regardless of the current bore size, if it is .040 over you still have a little room to play with if need be.

Depends on if its really sleeved. I have darton sleeves but they are the small ones, 82mm is the max you can bore them out and still have the thickness protection.

[DarKStaR]

holy fuck, 39 replies and I answered the question in the second post. lol.
Thats because your a homo and noone believes you :taun:


i live in columbus ga. and im jsut going to take it to a shop and get them to mic it out. seems like itd be way easier that way lol
Smart move

[Black4DrEK]

holy fuck, 39 replies and I answered the question in the second post. lol.

Haha. true.. But then a Certain someone.. Starting saying the wrong Info.. THen the OP started asking weird questions again..haha..

Gota love it!

[EmminoDaGreat]

I just assumed it was invisible, but the homo thing may be it. I'll have to fix that.

[clumsy_smurf]

ha thanks guys

[Bacon]

I never said Emmino was wrong though. :goodjob:

[EmminoDaGreat]

I know :) i didn't want to call you out, I figured you would find out on you own with the discrepencies in the thread.

[Bacon]

That's why I proved myself wrong and made that known.

[bseriesus]

I wounder If thats my old block?!? LOL

[nelson9995]

.40= 82mm for sure

[clumsy_smurf]

it might be, if ur aaron then yes