im going to buy a set of pistons in a few days, but 81mm 12:1 compression dont need to be sleeved, but 84mm 12:5:1 compression does.... what does the extra mm do for you?

 

The extra 3mm per cylinder will give you an extra 140cc's or 8.54ci displacement overall.

 

More displacement. 1.8L goes up to 2.0L leads to more torque.

 

http://auto.howstuffworks.com/engine1.htm

 

you sound like you need to do a *lot* more reading before you buy anything.

 

you were that kid trying to put the square into the circle hole werent you...

If the 81mm is stock and the piston your looking at is 84mm- that means the stock cylinder would have to be opened up larger right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94IntegraDB8 &raquo;</TD></TR><TR><TD CLASS="quote">im going to buy a set of pistons in a few days, but 81mm 12:1 compression dont need to be sleeved, but 84mm 12:5:1 compression does.... what does the extra mm do for you? </TD></TR></TABLE>

if you want to go 84mm just get a b20 block and some RS or Sparks pistons.. great results from the b20 vtecs... look up the thread in this forum thats all about b20 vtec stock sleeve dyno's for some more ideas.. also just search for b20 dyno.. lots of info about that setup on here.

good luck!