Just had a look at some starion piston I've got sittting around and they have one
valve relief on nissan intake side and two valve reliefs on the other they must use
the same pistons in the 2 valve and 3 valve motor. There 85mm dia standard and made
from what mitsi term as special aluminium alloy with steel strut incorporated and
run a .0012-.002 thou clearance so i gather they must be high in silicone. Mitsi
charge around $120 each plus rings although RPW in perth have replacements for
around $350( includes hasting rings) a set or if someone wants some second hand ones
they can have mine for free, just pay for rod removal and frieght.
Andrew Smith
jamesf wrote:
> the Starion ones have reliefs...whether they are in the right spot
> is another question....but there is heaps of meat to put them in if
> needed....
>
> Adam wrote:
>
> > What about the valve releif for the Pistons?
> >
> > At 10:30 13/10/2000 +1000, you wrote:
> > >Hi Errol
> > >
> > >The only reason I thought of decking the block was because the first motor
> > >Datrally built for me, Les decked my L20B block 100 thou to get the
> > >compression up.... and there was plenty of meat left around the water
> > >galleries in the block and it never gave me any trouble....
> > >
> > >The dish Vol of the Starion pistons is 18cc
> > >with the 18cc and the PDH of 3.55mm below you should get around 6.4:1
> > >I think 80 thou off the block should do it just nicely..... it would drop the
> > >PDH to 1.55mm... making for a much nicer ratio of around 7.2:1
> > >
> > >BTW. if you take a standard L20b (with standard L20B pistons etc) and bolt
> > >a Z18 head to it you end up with around 8.4:1 (getting a bit high, but with
> > >full management computer and Big intercooler it would probably be ok)
> > >
> > >another combo I think would possibly be workable...
> > >L20B block + Z22 crank + L20B rods + 85mm starion pistons
> > >= PDH of 0.55mm (below) and a total capacity of 2088.2cc
> > >and a ratio of around 8.16:1
> > >If you used 86mm starion pistons you would end up with 2137.64cc
> > >and around 8.32:1 .... getting a bit high again but with full management and
> > >big intercooler.... it would be a torquey little sucker :)
> > >
> > >
> > >Cya
> > >JamesF
> >
>
> --
> ________________________________________________________________________
>
> James Fitness
> Director
> Data Scribe Australia Pty Ltd
> http://www.datascribe.com.au
> Computers and Supplies
>
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>
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