If I wanna get new forged pistons for a B18b block, am I going to need sleeves also or will I be fine?

 

bump

 

if stock bore, you dont need sleeves. depending on whut you plan on doing.

 

well i plan on boosting it, so id want to add low comp pistons. I want the sleeves eventually, but i dont have the cash for em

 

someone told me that forged pistons will expand and rub against the stock honda sleeves

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GWInquisitor14 &raquo;</TD></TR><TR><TD CLASS="quote">someone told me that forged pistons will expand and rub against the stock honda sleeves</TD></TR></TABLE>

yeah, thats why you run more piston to cyl. wall clearance.
forged pistons will be a lot harder on your cyl. walls no matter what.

 

run more or run less? cuz if u run more, isn't there a greater possibility of rubbing when it expands?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GWInquisitor14 &raquo;</TD></TR><TR><TD CLASS="quote">run more or run less? cuz if u run more, isn't there a greater possibility of rubbing when it expands?</TD></TR></TABLE>

no, if you run less clearance it will rub more.....forged pistons run more clearance, thats why when cold they slap

 

If you run more piston to wall clearance than there is more room for the pistons to grow. the piston manufacturer will be able to tell you what clearance to run. the amount of clearances also depends on the compression of the piston and the amount of boost and or N2O you are going to be running.

 

ya, for example:

stock PTWC is : around .0016

and lets say...Endyn/Wiseco run around 0.0021-0.0022

 

oh yah duh LOL i must have misinterupted that. Is that all u need to do to make sure the piston wont rub?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GWInquisitor14 &raquo;</TD></TR><TR><TD CLASS="quote">oh yah duh LOL i must have misinterupted that. Is that all u need to do to make sure the piston wont rub?</TD></TR></TABLE>

kinda, i mean it all depends on what your goals are; for example for NA you dont need such a big ptwc because they wont expand as much as FI applications.And tighter clearance is better for longevity and ring seal.
For FI applications also differs in how much boost you going to run....more boost= more clearance