KZ vs NF, Overbore
billzcat1 at hotmail.com
Thu Nov 15 10:22:28 EST 2001
Oh BTW these oil-squirters...where are those located? I've never been quite
sure about that although I've heard of that on many of the higher-quality
turbo cars. I know it sprays the bottom of the pistons with oil to cool
them...but where are they, how do they work?
1990 CQ 193K
----- Original Message -----
From: <JShadzi at aol.com>
To: <billzcat1 at hotmail.com>
Sent: Thursday, November 15, 2001 6:36 AM
Subject: Re: KZ vs NF, Overbore
> And don't forget the oil squirters, it won't have those, but they can be
> added, but that starts driving up the cost quite a bit instead of simply
> finding an NF/NG block. Also, the KZ is machined differently wrt the way
> AC bracketry bolts up, the NF using the spot where the MC has the turbo
> return line.
> Any of the I5 blocks can easily be bored to 83+mm without any problems.
> with up to 84mm, but that is pushing the block and head gasket surface to
> There is nothing that makes the NF different from the KZ in regards to
> size and cylinder walll thickness, they are identical in that respect, one
> just has had a bigger bore cut out of it.
> In a message dated 11/14/2001 11:59:12 PM Pacific Standard Time,
> billzcat1 at hotmail.com writes:
> << In the never-ending quest for knowledge and hp....
> The main difference between the KZ block and NF block is the bore - KZ
> smaller at 81.0mm, NF at 82.5mm.
> What is the maximum overbore a KZ block can take? Factory lists oversize
> pistons up to 81.5mm but I was wondering if they could be bored up to
> to essentially turn it into an NF block. And then, maybe 83.0mm, the
> factory-spec oversized (2+) pistons.
> I was thinking that the cylinder walls would be thickest on the KZ when
> was stock - then you could bore it up to the NF size for a little more
> displacement and still have a decent wall in there.
> I'm sure there are tons of you out there who have had their KZ apart and
> could probably tell if the block could take 1.5mm overbore.
> 1990 CQ 193K
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