i've done the search and seen all the threads, just making sure i have it right. if i put my z6 pistons in my y8 the will have a little higher compression? right? they a 8.5 so i don't mind bumping it up a little if i read right. thanks for your help and info!

 

I think you'd lose compression if you put Z6 pistons in a Y8 block, the Z6 has like .4 lower compression ratio.

So assuming they make a Z6 8.5 comp, they'd probably be around 8 flat in a Y8...

That's all theory, b/c the Z6 runs like a 9.14 I think, and I think the Y8 runs like a 9.6 - so uhh, 8.5 in a Z6 would be a bit diff in a Y8 b/c I think the crank offsets are the same.

O.o

Bump for ya.

 

Have you tried D-series.org?

 

im prett sure the y8s head is smaller combustion chamber than the z which would raise compression

 

i read through a bunch of post about this when i did my search, and i thought if you put y8 pistons in a z6 it lowers the compression, so, if i you put z6 into a y8 it raises the compression

 

i think your right i know the y8 has dish pistons and a smaller chamber so the z pistons which are not dished with the smaller chamber head you would gain comp

 

Nope you will lose compression if you put the z6 pistons into the y8. Stock CR for a y8 is 9.6096, used with just z6 pistons you will get 8.9391. So YES you will lose compression if you use the z6 pistons. I got these readings from http://www.c-speedracing.com/h...c.php

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dravesef &raquo;</TD></TR><TR><TD CLASS="quote">i read through a bunch of post about this when i did my search, and i thought if you put y8 pistons in a z6 it lowers the compression, so, if i you put z6 into a y8 it raises the compression </TD></TR></TABLE>

It's possible, I don't know for sure b/c the heads are slightly different, but the Y8 runs like a 9.6 CR while the Z6 runs like a 9.2 CR, and I think they run the same offset crank. So uhh, iono anything about how their heads compare, that'd be the deciding factor.

 

i dont know much about dseries but i think the ZC pistons are better than the z6 or y8 if you want a higher compression.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by .:Swig:. &raquo;</TD></TR><TR><TD CLASS="quote">i dont know much about dseries but i think the ZC pistons are better than the z6 or y8 if you want a higher compression.</TD></TR></TABLE>

He's rolling back the CR, 9.2 (stock) &gt; 8.5 (his JE new pistons) - he's probably making a nitrous engine or plans on boosting.

 

ah i thought he just wanted to change out pistons for higher comp.

 

o, i thought he wanted MORE compression. even still with just the pistons the cr will only be 8.9