I've finally found a new block to replace the one that the machine shop fugged up. I have the ductile iron sleeves, and a set of Eagle rods, but now I'm debating on what size to bore them too. I was looking at going with an 84mm bore, but an 85mm will take me over 2.oL which is a sexy proposition, especially with the jrsc. It should fill the cylinders very nicely. Add a wet nitrous setup, and power won't be an issue.

So here's the deal.
What size would you bore to?

 

no opinions yet?

 

84mm so you have room if you melt a piston or anything and need to resleeve. Still gives you a little safety space. That is what i bored mine out to so i am partial towards that, otherwise its your block so you should make the deceision

 

what are the difference when boring to different sizes

 

I would and did bore to 84mm.

 

Start with 81mm.

No one seems to realize that there is a downside to the 2.0L madness. Goto JE's website and take a look at piston weights and you'll see what Im getting at.

For the most part you wont make much more power at 84mm anyways. It makes all the difference for all mota guys, but for turbo its not necessary. If you want to go a little bigger than 81 then goto 83.
This is my opinion and many others I know of. I would rather have a lighter reciprocating assembly then have an extra 15 whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote"> I would rather have a lighter reciprocating assembly then have an extra 15 whp.</TD></TR></TABLE>

The 81mm are 280 grams, and the 84mm are 286 grams.
Is it really that big of a difference, especially when running aftermarket rods and studs?

I'm thinking that an additional 15hp would be worth the small addition in weight, but I could be wrong.

 

do not go over 82mm...b-series motors are open deck... the more you bore the thinner the sleeves are... and you dont want thin cylinder walls with alot of cylinder pressure...and make sure that you get a blockgaurd to close the deck...but i would seriously not go over 82mm. and you arent losing anything by staying low displacement...

 

Turbo loves displacement... the more displacement, the more exhaust energy potential, the faster you spool... I don't see the downside ?!

I went with an 83mm on my all motor setup, with nitrous plans in the future.... I never looked back... I haven't sprayed it yet, but the difference is SUPER... low end tq with gobs of power up top.

the reason I went 83, not 84... same as mentioned... it gives me space to rebuild if anything goes wrong..... then I'd get to go 2.0...


My Vote 83mm

 

84mm is safe...

 

all motor is completly different.... forced induction has alot more cylinder pressure....if you dont want to listen that is fine but what i am saying is fact

 

what i am saying is that the cylinder pressure is way too high... on stock sleeves you shouldnt go above 82mm.. and if you want the exhuast gasses then just run 9.0 to 1 compression

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">what i am saying is that the cylinder pressure is way too high... on stock sleeves you shouldnt go above 82mm.. and if you want the exhuast gasses then just run 9.0 to 1 compression</TD></TR></TABLE>

no one is tlakign about stock sleeves..

 

No stock sleeves here, thanks!


The sleeves I'm running have been raced up to an 87mm bore, with no issues(although I'd never run past 86mm).

FYI, the difference in cylinder volume between an 81mm and 84mm bore is around 51 cu*cm (399 vs 450) or the equivilant of a good head porting.
The only downside is that without proper headwork, and cams, I'll run out of power at a lower RPM (because the head can only fill so fast in the chamber).

something to think about.....

 

the factory b-series has iron ductile sleeves...... so what kind of sleeves do you have?

 

Umm.... turbofodo.... do you know how honda makes their open deck blocks ?

 

Just another clueless know it all we have here.

 

It's when they're cocky about it that irks me....

Nice #'s there 93LSivic

X2 (I'm off to the Pier1 fete.... woo hoo... )

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">do not go over 82mm...b-series motors are open deck... the more you bore the thinner the sleeves are... and you dont want thin cylinder walls with alot of cylinder pressure...and make sure that you get a blockgaurd to close the deck...but i would seriously not go over 82mm. and you arent losing anything by staying low displacement...</TD></TR></TABLE>

Why wouldn't you bore a <U>AFTERMARKET SLEEVED</U> block over 82???????????? none is talking about stock sleeves aftermarket sleeves like GE, AEBS, Darton. those sleeves have been tested up to 55+ PSI so there should be no worries about running 20psi on them.

 

hold on a sec..... not once did i say "knew it all"... i was under the impression that they were stock sleeves...i apologize for the misconseption... however if you do not agree with me then i think you should do some research on the stock sleeves!

as far as how they make the open deck blocks is regardless...its WHY they make them open deck...

and yes if the sleeves are aftermarket i agree that you should go as big as 86mm.... but not with an open deck...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">hold on a sec..... not once did i say "knew it all"... i was under the impression that they were stock sleeves...i apologize for the misconseption... however if you do not agree with me then i think you should do some research on the stock sleeves!

as far as how they make the open deck blocks is regardless...its WHY they make them open deck...

and yes if the sleeves are aftermarket i agree that you should go as big as 86mm.... but not with an open deck...</TD></TR></TABLE>

I've been reading on this forum some time. Sometimes I need a good laugh, but after I read yours I decided to register so I could tell you to quit while you're ahead. You're mis-informed I believe. I'd rather have an open-deck design anyday if the sleeves are thick enough. Like on aftermarket ones.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">hold on a sec..... not once did i say "knew it all"... i was under the impression that they were stock sleeves...i apologize for the misconseption...</TD></TR></TABLE>

Calm down. Take a

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">however if you do not agree with me then i think you should do some research on the stock sleeves!</TD></TR></TABLE>

No one is disagreeing with you. You're not even remotely close to which page we're on. You're in an entirely different book.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">as far as how they make the open deck blocks is regardless...its WHY they make them open deck...</TD></TR></TABLE>

If you think they made it ONLY because it cools better, then you're wrong.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">and yes if the sleeves are aftermarket i agree that you should go as big as 86mm....</TD></TR></TABLE>

Perhaps with an NA setup.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbofodo &raquo;</TD></TR><TR><TD CLASS="quote">but not with an open deck...</TD></TR></TABLE>

RS and Benson.

 

As it stands, I'm going with an 84mm setup like originally planned.

 

go 83mm it leaves room for error!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rocket256 &raquo;</TD></TR><TR><TD CLASS="quote">go 83mm it leaves room for error!!!!! </TD></TR></TABLE>

Yeah and so does 84mm