ive been thinking about doing a "budget" build on my ls integra. i have 2 used sets of cp 81.5 pistons (5 good pistons total). i was wondering if it would be safe to use them? also, when i get the block machined, should i just bring a new 81.5 piston and have them spec the block to that?

so, if it were you, would you use these pistons?


Intake side


Exhaust side

 

ive reused pistons from previous owners in the past without a problem. I just treated them like they were brand new and had machine work done by measuring them etc.

 

i would like to know the same to this question...so someone please let us know...thanx

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SPOOLINmatt &raquo;</TD></TR><TR><TD CLASS="quote">ive reused pistons from previous owners in the past without a problem. I just treated them like they were brand new and had machine work done by measuring them etc. </TD></TR></TABLE>

ditto

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SPOOLINmatt &raquo;</TD></TR><TR><TD CLASS="quote">ive reused pistons from previous owners in the past without a problem. I just treated them like they were brand new and had machine work done by measuring them etc. </TD></TR></TABLE>

so, cp recommends piston to wall clearance of .0035. now, its my understanding the machine shop measures this gap at the base of the piston skirt. since the piston is used, the skirt is slightly worn down compared to new. now, if it is machined based on the used pistons measurements, would the piston be too tight at the top of the piston skirt? eventually causing excess friction as the piston expands, destroying the motor?

i think spec'ing it off of a new piston would be safer.

 

That would be usefull if you had that individual piston's origional measurements, each has it's own. I would see what the general variance range specs are from CP for the skirts (acceptable ranges for measurements to qualify it to be in spec) and compare your number to that and make a judgement.