I'm looking into buying some 81mm JE 9:1 pistons, and I found some for sale for a good price, but the seller says that he bought them for a gsr motor whereas I am running a b16. I know that both stock bores are 81mm but what I am wondering is are the pistons going to be a different compression in my motor due to the fact that b18c's and b16a's have different compressions to begin with?

 

bump

 

compression will be considerably lower than 9:1

 

I have 9:1cr JE GS-R pistons too and they yeild a 8.8:1cr in my b16a2 with stock head gasket!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 9psiTurboSI &raquo;</TD></TR><TR><TD CLASS="quote">I have 9:1cr JE GS-R pistons too and they yeild a 8.8:1cr in my b16a2 with stock head gasket!</TD></TR></TABLE>

That's about right Moe.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ben@importparts.com &raquo;</TD></TR><TR><TD CLASS="quote">

That's about right Moe.</TD></TR></TABLE>

Which I purchased from you

 

 

THey will drop compression Approximately 1 full point, which will make it 8:1. 8.8:1 compression will only factor in the compression loss from the head alone.