efKART

I have an LS motor in the machine shop and I was wondering what the limits on boring an LS block, its a limit and the machinist wants to bore it out pretty big(.050)since there are something wrong with the cylinder walls.
How much power can I make before I crack a sleeve with a bore like that, I plan on going FI in the future.

SynTeg

For boost I wouldn't go more than 81.5mm

Muckman

iTrader: (2)

I agree, with stock sleeves no more than a standard .5 overbore. If you get it sleeved then 85 is the max.

xsi-t

Like everyone else said. 81.50 is the limit with boost IMO. You will see how thin the sleeves get at 81.50

stockb18c

^ yup

boosted92

If he's actually talking about going .050" over, slap him. That's a 1.25mm overbore, and I don't know if the cylinders would stay round with an all motor application.

nonvtecallmotor

You can make 600+whp on a 81.5mm bore as long as your tune is good.

taggart_lumpy

not giving you any ideas but we had a 84mm stock sleeve ls that was boosted for a bit just had block filler in about the first inch of the water jacket..... we ended up spinning a bearing


Modified by taggart_lumpy at 2:41 AM 3/3/2007

xsi-t

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by taggart_lumpy &raquo;</TD></TR><TR><TD CLASS="quote">not giving you any ideas but we had a 84mm stock sleeve ls that was boosted for a bit just had block filler in about the first inch of the water jacket..... we ended up spinning bearing</TD></TR></TABLE>

B20? If not do you have pictures?

efKART

81.5 is what mine would be if its .050 over? also, how big will my motor be then?

SynTeg

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by efKART &raquo;</TD></TR><TR><TD CLASS="quote">81.5 is what mine would be if its .050 over? also, how big will my motor be then?</TD></TR></TABLE> .020=81.5mm which will still be a 1.86L


Modified by SynTeg at 9:03 AM 2/27/2007

b18sihatch

get a new block if it needs to be bored that much

dpetro1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by efKART &raquo;</TD></TR><TR><TD CLASS="quote">81.5 is what mine would be if its .050 over? </TD></TR></TABLE>

no as mentioned above... .050 inches = 1.25mm. so your motor would have a 82.25mm bore which is too big on stock sleeves. if you need to go more than .020 inches or .5mm than you should just go ahead and resleeve the whole motor.

taggart_lumpy

no pics but i promise its one of the weirdest things youve ever seen