what is the max I can bore a sleeved z6 to? i was told that 78mm will give me a 1.8L motor. can I go any bigger or is that about it?

 

mine will be 79 mm but no turbo for me, I don't wanna risk it

 

ok thank you. anyone else? i will be boosting and spraying this motor

 

bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX_Phantom1 &raquo;</TD></TR><TR><TD CLASS="quote">what is the max I can bore a sleeved z6 to? i was told that 78mm will give me a 1.8L motor. can I go any bigger or is that about it?</TD></TR></TABLE>

A 1.8L z6 would need a 79.5mm bore. But it's best not to overbore it. Thicker sleeves = more boost, and boost &gt; displacement.

 

how much does the machinist who installed teh sleeves say you should bore it at most to?

 

im actually buying the block off a buddy of mine. he said bore it to 78mm

 

78mm = 1.72L.

It's kind of a bad idea to go that big because you can only do about two rebuilds before the sleeves become useless. (assuming you do a .5mm overbore with each rebuild). Plus you'll have to buy a different set of custom pistons with each rebuild because no one makes them that big.

 

I see. so should i just leave it bored at 76mm? b/c thats what it is right now

 

I would leave it at 76. If you go to 78 you won't see any noticeable gains. Plus, if you ever melt a piston, you will always have a nice buffer to bore the sleeves out to 77 or 78.

 

that sound like a good idea. thanks