AAN compression with JE pistons?

[euro_urs4]

Hi all, I was wondering if anyone knew or could verify that I am correct with the compression on my urs4, my JE pistons are 8.5:1 with .5mm over sized intake and exhaust valves. just wondering what my expected compression ratio is supposed to be, doing the math i got 125 roughly. (is this correct) also just outta curiosity what is a aan motor stock compression ratio? thanks in advance

[caterpillar]

AAN does have 9.3-1 comp...

[prj]

I think you need to understand the difference between a static compression ratio and dynamic compression, and then start from square one.

[euro_urs4]

understood, any ideas what the number to expect with oem and 8.5:1? (in psi)

[prj]

No
There are too many factors. That's why a very broad range is always given.

[euro_urs4]

No
There are too many factors. That's why a very broad range is always given.

i see, thanks for the input