THE GAME IS THICK

I've searched for this topic in archived and recent topics but didn't really find any useful info. Would it be safe to bore a B18B1 block to 84mm and the use of a block gaurd without re-sleeving? I am told that it would be a simular block to a B20 but i have a few doubts about doing this on stock sleeves. I would be running JE 12:1 pistons staying N/A NON-VTEC. My other option is CTR pistons with a 81.5 bore. I was offered a good deal on these JE pistions and im just searching for info on this matter. Also Newbies you know the drill, dont reply to this topic unless you know what the hell you are talking about.

asubennett

Max bore on a LS block is 82mm without getting it sleeved.

If you do not want to sleeve the block and run 84+mm bore you want a B20 block.

It has the same 89mm stroke crank as the LS block does if that is the motivating factor for you choosing the LS block.

arw321

I'm 99% sure that OEM CTR pistons are only available in 81 and 81.25mm. Someone correct me if I'm wrong.

Darkane

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by asubennett &raquo;</TD></TR><TR><TD CLASS="quote">Max bore on a LS block is 82mm without getting it sleeved.

If you do not want to sleeve the block and run 84+mm bore you want a B20 block.

It has the same 89mm stroke crank as the LS block does if that is the motivating factor for you choosing the LS block. </TD></TR></TABLE>

You can bore an Ls to 84mm. heck you can bore it to 85 just wont be safe But the LS blocks and B20 have the same sleeves I think. So in theory a 84mm LS will be a B20block. As far as being safe with 12:1 I think it will be okay with the right tuning. Remeber Revs crack sleeves and so does detonation. So keep the revs down 8k or less and I think you'll be good. Also side note: An LS head is only good to 8-8.5k then there is serious issues with the rocker arm assembly. Food for thought.

asubennett

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Darkane &raquo;</TD></TR><TR><TD CLASS="quote">

You can bore an Ls to 84mm. heck you can bore it to 85 just wont be safe But the LS blocks and B20 have the same sleeves I think. So in theory a 84mm LS will be a B20block. As far as being safe with 12:1 I think it will be okay with the right tuning. Remeber Revs crack sleeves and so does detonation. So keep the revs down 8k or less and I think you'll be good. Also side note: An LS head is only good to 8-8.5k then there is serious issues with the rocker arm assembly. Food for thought.</TD></TR></TABLE>

Check your information again buddy.

You can not bore an LS block past 82mm unless it is sleeved. Have you ever seen an LS block?? I don't know where you get your information but you should be more careful passing down half *** information becasue one day someone will listen to you and waste a lot of $.

Cliffnotes- LS Block/ Stock Sleeves= 82mm Bore Max
B20 Block/ Stock Sleeves= 85mm Bore Max
Any sleeved B series block= 86mm Bore Max

I have an 85mm Ls block but it is sleeved with Darton sleeves. You will literally have paper thin sleeves if you bored out a stock LS block past 82mm. So thin you could flick the side of a sleeve and take a chunk out. lol

1 2 NV

actually i hate to correct u but darton will make sleeves for a B series for 87mm bore. a guy i know had them. its a little known little used size obviously. just some food for thought.

earl

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 2 NV &raquo;</TD></TR><TR><TD CLASS="quote">actually i hate to correct u but darton will make sleeves for a B series for 87mm bore. a guy i know had them. its a little known little used size obviously. just some food for thought.</TD></TR></TABLE>Uuh, Darton or any other sleeve maker does not make sleeves in particular sizes. Any aftermarket sleeve can be bored to 87mm. They will just be paper thin. You are not limited by the sleeve but by the bore centerlines. Sooner or later you will just hit the adjacent sleeve.

earl

BTW, the B20 block is no where near the same as the B18A/B. There is a lot more aluminum around the outside of the sleeves of the b20. You might get 83mm out of a B18A or you might hit aluminum, 50-50 odds.

THE GAME IS THICK

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by arw321 &raquo;</TD></TR><TR><TD CLASS="quote">I'm 99% sure that OEM CTR pistons are only available in 81 and 81.25mm. Someone correct me if I'm wrong.
</TD></TR></TABLE>

81.5-81.25 SAME THING. YOU SAY TOMATO I SAY POTATO.
I guess ill be searching more on re-sleeving or just going with the CTR's. More replies are welcome.

jessevtec

what is the displacement with a bore of 82 mm?

1 2 NV

i think u know what i meant earl. i never saw the block personally so im not sure if they offset the centerbore of the sleeves or what.

Westrock2000

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jessevtec &raquo;</TD></TR><TR><TD CLASS="quote">what is the displacement with a bore of 82 mm?</TD></TR></TABLE>

It would be ~1855cc.....then you could be like Honda and call it a 1.9L


Also as far as going to 86-87mm on the bore, you also have to consider the headgasket at that point...you'll only have a few mm's width of gasket material between the bores...it will be very flimsy. Cometic I think makes some, and some places will bore out a stock headgasket, but there have been many reports of blow-outs after not very long.


The best bet for maximum displacement in a B, is to get the Eagle stroker crank shaft, and bore to 85 or so....you'll get about 2.1-2.2L. Otherwise your only option is to (in keeping the LS characteristics) go with a H23 or F23.

IntegraB18

i was reading the import tuner b-series shootout and JG said that they do 83mm with a block guard on stock sleeves on a lot of customer cars and hasnt had a problem yet...so if u want to make sure u can give them a call to get al the details...i was actually thinkin bout doin this set up but i decided to save up for sleeves and do like 85mm or something...hope this helps

ponytd

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IntegraB18 &raquo;</TD></TR><TR><TD CLASS="quote">i was reading the import tuner b-series shootout and JG said that they do 83mm with a block guard on stock sleeves on a lot of customer cars and hasnt had a problem yet...so if u want to make sure u can give them a call to get al the details...i was actually thinkin bout doin this set up but i decided to save up for sleeves and do like 85mm or something...hope this helps</TD></TR></TABLE>

you can do that but it is a lot safer to completely resleeve it, as many iron sleeves present cooling problems. here is a link http://www.overboost.com/story.asp?id=464

it is best to resleeve it with darton, golden eagle, or whatever floats your boat, whenever you go over 82mm

Used2beAb16

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jessevtec &raquo;</TD></TR><TR><TD CLASS="quote">what is the displacement with a bore of 82 mm?</TD></TR></TABLE>

Depends what crank you are going to using with the 82 mm bore

asubennett

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1 2 NV &raquo;</TD></TR><TR><TD CLASS="quote">actually i hate to correct u but darton will make sleeves for a B series for 87mm bore. a guy i know had them. its a little known little used size obviously. just some food for thought.</TD></TR></TABLE>

Hey no problem man, I really had never heard of that so I learned something new. I am sure this would be for a race car only. Seems a bit thin and how on earth would you get a head gasket to seal on that&gt;??

Anyway I still think 86mm would be the most I would go and consider driving on the street still. But thanks for the info because I thought it was impossible.

arw321

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HYPHYBOY &raquo;</TD></TR><TR><TD CLASS="quote">

81.5-81.25 SAME THING. YOU SAY TOMATO I SAY POTATO.
I guess ill be searching more on re-sleeving or just going with the CTR's. More replies are welcome. </TD></TR></TABLE>


lol
Hey, I just don't want you to have your machine shop bore your block to 81.5mm, causing you to run to your local Honda dealer for some 81.5 PCT's.

THE GAME IS THICK

thanks for looking out.

hybrid_vtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by arw321 &raquo;</TD></TR><TR><TD CLASS="quote">I'm 99% sure that OEM CTR pistons are only available in 81 and 81.25mm. Someone correct me if I'm wrong.
</TD></TR></TABLE>


You are 100% Right!

jessevtec

stock gsr crank.