Just an idea Tom (if you haven't already thought of it...)
When I turboed my L20, I was in a similar boat re cost of custom slugs....
I ended up using a piston with a shorter pin height (Pin to piston top, not
pin diameter). This effectively gives you a bigger dish (because at TDC you
are left with a larger squish area) and doesn't affect your swept volume.
For mine I used a GroupA Skyline piston (I'll try find a part no.) they were
4mm O/S (yes thats way O/S but never split a bore). From memory they had a
4 or 5mm shorter pin height so comp ratio was Way Down! like 6.5 or 7:1 but
this wasn't a problem with 25psi boost.
Anyway my $.02
Cam.
----- Original Message -----
From: "Tom Richardson" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, March 15, 2001 12:23 PM
Subject: RE: Z18/Z20, Forged pistons
> Thanks for the replies Brad, Daniel, Mark
>
> The reason I'm asking about forged pistons is not because I am keen to
blow
> $1400+ or think I'm going to be running 25psi of boost on the street, it's
> because if I were to pursue a Z22 stroker with the long Z20E rods (to
> reclaim some revs) there is no piston available which produces the right
> compression ratio with the NAPS/Z cylinder head (or even one which
produces
> a realistic N/A compression ratio). I need something with a 28mm height
and
> 15cc dish. What other options are there besides custom forged pistons?
Does
> anybody know of an OEM cast piston with a 28mm height and 15cc dish?
2187cc
> turbo would have been sweet but I'll stick with a set of 31.6mm ACL cast
> pistons with chromoly rings for $215 and 1998cc if the only other choice
is
> exy custom pistons.
>
> Thanks again guys
>
> - Tom
>
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Brad HALLETT
> Sent: Thursday, 15 March 2001 2:35 AM
> To: [EMAIL PROTECTED]
> Subject: RE: Z18/Z20, Forged pistons
>
>
> Precision do 'em (http://apep.alphalink.com.au/), excellent piston at the
> right price. I would order them through Datrats though to ensure you get
> the best $$$.
>
> Many people disagree with forged pistons, and it basically falls back onto
> what you expect from your motor. If you want twin turbos but only around
> the street at low to mid psi then maybe you will survive with cast slugs.
> If you want a reliable 6500rpm-9500rpm high comp performer then go to the
> expense of forgies. Don't spend a mint on an engine and have a piston
self
> destruct at the worst moment.
>
>
>
> Regards
> Brad HALLETT
> http://www.powerup.com.au/~bhallett
>
> http://www.datrats.com.au for all Datsun performance equipment!
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of mark krawczuk
> Sent: Wednesday, 14 March 2001 11:40
> To: [EMAIL PROTECTED]
> Subject: Re: Z18/Z20, Forged pistons
>
>
> Hello Tom
>
> >
> > What I wanted to know was, has anybody had custom forged pistons made to
> > order? Where from, and how expensive were they? Alternatively, does
> > anybody know of an OEM piston of this size (87mm bore) with 21mm
> > wristpins?
>
>
>
> hi, i got a price on +1mm forged pistons for a l20b motor , and th e guy
> quoted me $1400, yeah right, the guy seemed a wanker,saying that forged
> pistons are the only way to go, ESPECIALLY for a turbo.
> i spoke to a guy in queensland who ONLY DOES TURBO STUFF and when i
asked
> him about using forged pistons, he said f**K that, he has never used
forged
> pistons, and at the moment he said he was doing a v8 ford with twin turbos
> using CAST pistons.....
>
>
> my setup is : z2.4 crank, l20b block,z24 head,microtech digi 1,to3
turbo,
> and programmable ignition and CAST pistons ,which i am definately using.
>
> he said the that u have to be very carefull about leaning out the fuel
mix,
> (as with any car) if its too lean it will damage the pisons , and a
> forged set will last about 7 seconds longer than cast if the motor is
> leaned out.
> >
>
>
> mark
>
>
>
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