KZ vs NF, Overbore

[JShadzi at aol.com]

Yes, they are a simple device, a ball and spring vavle, once oil pressure comes up the spring compresses and they start squirting the bottom of the piston.  A hole must be machined down into an oil passage, they are pressed in, and a hole must be drilled and tapped to fit an allen bolt that keeps them there.  A lot of work, not worth it when ready to go blocks are around.
Javad

In a message dated Thu, 15 Nov 2001  1:33:22 PM Eastern Standard Time, "Richard Hoffman" <billzcat1 at hotmail.com> writes:

> 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?
>
> Richard
> 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
> the
> > AC bracketry bolts up, the NF using the spot where the MC has the turbo
> oil
> > return line.
> >
> > Any of the I5 blocks can easily be bored to 83+mm without any problems.
> BTDT
> > with up to 84mm, but that is pushing the block and head gasket surface to
> its
> > max.
> >
> > There is nothing that makes the NF different from the KZ in regards to
> bore
> > size and cylinder walll thickness, they are identical in that respect, one
> > just has had a bigger bore cut out of it.
> >
> > Javad
> > 80tq.com
> >
> > 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
> 82.5
> >  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
> it
> >  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.
> >
> >  Thanks!
> >
> >  Richard
> >  1990 CQ 193K
> >   >>
> >