red_crx

iTrader: (2)

Ok, here's the thing. I got ahold of a GSR with

Eagle rods w/ ARP rod bolts
Arias 9:1 pistons (81mm)
skunk2 cam gears
arp head studs
skunk2 springs and retainers
LS crank

I was thinking about just having the motors sleeved and re-ringed....or should I go for a bigger size piston and bore. I plan on boosting this motor and hope for 600whp or somewhere around that territory .

I would like some opinions, Please.

JDM turbo DC

iTrader: (6)

stock bore with some nice sleeves, darton benson golden eagle

BLKTeg94

sleeves and a stock bore will work just great. Haven't really seen a big improvement in horse comparing the 81mm vs an 84mm bore. they both can put down great numbers. the 81mm will also leave you more room to bore in case something happens to go wrong. You won't be screw out of a brand new set of sleeves.

JDM turbo DC

iTrader: (6)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLKTeg94 &raquo;</TD></TR><TR><TD CLASS="quote">sleeves and a stock bore will work just great. Haven't really seen a big improvement in horse comparing the 81mm vs an 84mm bore. they both can put down great numbers. the 81mm will also leave you more room to bore in case something happens to go wrong. You won't be screw out of a brand new set of sleeves.</TD></TR></TABLE>

from 81 to 84, you'll pick up some torque but not any real noticeable horsepower

DaveF

81.5 IMO is best bore.. leaves room for a few rebuilds

boosted92

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLKTeg94 &raquo;</TD></TR><TR><TD CLASS="quote">sleeves and a stock bore will work just great. Haven't really seen a big improvement in horse comparing the 81mm vs an 84mm bore. they both can put down great numbers. the 81mm will also leave you more room to bore in case something happens to go wrong. You won't be screw out of a brand new set of sleeves.</TD></TR></TABLE>

http://forums.evans-tuning.com...=2088

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">200cc increase in displacement usually yields about 20-25 ft-lbs of torque.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hybrid &raquo;</TD></TR><TR><TD CLASS="quote">All in all it does show that its worth to go 84mm bore when sleeving and building a block.</TD></TR></TABLE>

I went 83mm with my build. If you're going to do enough damage to hurt more than 1mm of the cylinder walls (so that this would need to be bored past 84mm) you're probably going to have a rod sticking through part of your block, and I'm not concerned with the sleeves at that point, but it is worth it to go bigger bore if you are sleeving.

lalspeed

81.5 is good as is 84.5. 81 can make 600+ and 84 can make it too. torque production will prolly be better with the bigger engine but head work comes into play too. the head should be adressed in any build though. goodluck

red_crx

iTrader: (2)

Thanks guys....so the bigger bore will yield more tq, but even if i keep the stock bore it can still achieve 600hp.

JDM turbo DC

iTrader: (6)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by red_crx &raquo;</TD></TR><TR><TD CLASS="quote">Thanks guys....so the bigger bore will yield more tq, but even if i keep the stock bore it can still achieve 600hp.</TD></TR></TABLE>

yup

red_crx

iTrader: (2)

I think i might just keep it as is

BLKTeg94

Big bore (84mm) you'll also have to port out the CC on the head to fit the 84mm. So 81mm will save ya some money too

Gs-Rx

?

wantboost

iTrader: (2)

you dont really have to get the head cc'd to fit the 84mm bore, but it does help.

what he means by that is the combustion chamber is 81mm in diameter. they open up the combustion chamber diameter to fit the bore

tony1

Displacement makes power and spools turbos!!!!!! Go big!!!!