These pistons would be easier to use in a 2 litre L-series turbo
than a 2 litre Z-series... because with the L you have a much larger
range of heads with smaller combustion chambers so could do
a L20b with smaller chamber head, then wouldn't even have to
deck the block...
Errol Smith wrote:
> James,
> I like the Z22 crank option with the 86's, would that smoke em up!.
> Cheers
> Feral Errol
>
> ----------
> From: jamesf <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Re: time to build L20 turbo
> Date: Friday, October 13, 2000 10:30
>
> 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
>
> Errol Smith wrote:
>
> > James,
> > If you took that much of a block the water gallery boundaries would be a
> > problem I would think as they taper inside he block. The timing chain is
> > not a problem as you can fit a half link to take up the slack. If you use
> > the L20 rods I made the comp with this combo @ 7.88 with no piston dish
> > volume. How much dish volume do they have?
> > Cheers
> > Feral Errol
> >
> > ----------
> > From: jamesf <[EMAIL PROTECTED]>
> > To: [EMAIL PROTECTED]
> > Subject: Re: time to build L20 turbo
> > Date: Friday, October 13, 2000 1:07
> >
> > Thanks again Errol
> >
> > Still working on the combos for these turbo pistons I have...
> >
> > How do you think you would go with a L20B block that had been
> > decked 80 or 100 thou with a Z18et head bolted on top... would the
> > timing chain be to loose? or would the tensioner take it up?
> > you can't use a head saver kit on the cam like a L series head....
> >
> > I am thinking ... L20B/Z20 block & crank + L20b rods + turbo pistons
> > + Z18et head etc...
> > = 3.55mm piston deck height (PDH)....
> > this gives a ratio of around 6.4:1 (a bit low)
> >
> > Now if I can get away with decking the block 80 or 100 thou things
> > look a little better....
> >
> > 80 thou off the block gives a PDH of 1.55mm and a resulting
> > comp ratio of around 7.2:1
> >
> > 100 thou off gives a PDH of 1.05mm and a comp ratio around 7.44:1
> > (pretty good compared to the 7.3:1 the Z18et has as standard )
> >
> > I would probably go the 80 thou as it would allow for a 1mm over bore
> > at a later date without it raising the compression ratio to far...
> >
> > These Turbo pistons are only around $100 each in 85 or 86mm
> > I will find a use for these damm pistons yet :)
> >
> > Cya
> > JamesF
> >
> > Errol Smith wrote:
> >
> > > James
> > > To run the L20B crank in an L18 block you have to do a lot of relief
> work
> > > to clear the counterweights on the crank and line bore the mains to fit
> > the
> > > larger journals.
> > > To fit the L18 rods to the L20B crank the big end of the rod has to be
> > > opened up 5mm. This combo gives you a real bad rod angularity problem
> and
> > > the engines are very prone to punching a rod through the block (Yuk
> > messy)!
> > > Thrust vector on the piston varies as the sine of the rod angle. On
> this
> > > rod length its getting a bit too much thrust on the bore face, so the
> > bore
> > > flexes and breaks.
> > >
> > > Rods in LZ20E are 152.45mm with a piston comp height of 30.5mm. The
> 35mm
> > > pin height pistons would be good in a sleeved L16/L18, L20B, or LZ20
> with
> > > L20B rods.
> > > Often it is better to let the application find you than trying to make
> > them
> > > fit an application. I have many sets of rods and pistons that are
> waiting
> > > for me to find an ideal use for them. I just bought an L14 through
> paddy
> > > that solves a use problem for a set of rods and forgies that I have.
> > > Eventually they all fall into place.
> > > Cheers
> > > Feral Errol
> > >
> > > ----------
> > > From: jamesf <[EMAIL PROTECTED]>
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: time to build L20 turbo
> > > Date: Thursday, October 12, 2000 5:43
> > >
> > > Thanks Errol
> > >
> > > Cool....Ok so is there anyway to run L18 rods on a L20 crank in L18
> > block?
> > >
> > > And what is involved with putting the L20B crank into a L18 block??
> > >
> > > Also Errol do you know what length rods are in those Z20 blocks you
> have?
> > >
> > > I have some 85mm turbo pistons with 35mm pin height and 18cc dish that
> > > I am fiddling with trying to find a ideal combo of crank/rods/block for
> > > them....
> > >
> > > Cya
> > > JamesF
> > >
> > > Errol Smith wrote:
> > >
> > > > James,
> > > > L13, 14, 16 & 18 are 54.942mm same as L24 and L26
> > > > Cheers
> > > > Feral Errol
> > > > ----------
> > > > From: jamesf <[EMAIL PROTECTED]>
> > > > To: [EMAIL PROTECTED]
> > > > Subject: Re: time to build L20 turbo
> > > > Date: Thursday, October 12, 2000 2:21
> > > >
> > > > I noticed you didn't mention the L18/L16 rods here....What size is
> the
> > > > crank journal from those?
> > > >
> > > > JamesF
> > > >
> > > > Errol Smith wrote:
> > > >
> > > > > Andrew,
> > > > > All the following rods use a 59.942mm crank journal.
> > > > > L20B 145.9mm, LZ20 152.45, LZ22 145.9,
> > LZ24
> > > > > 143.9
> > > > > As you can see the only rod with some potential for lowering comp
> is
> > > the
> > > > > LZ24, even then only 2 mm.
> > > > > I personally would have gone for lower compression height pistons,
> > (30
> > > or
> > > > > 32mm compression height vs the normal 37.1mm).
> > > >
> > > > --
> > > >
> > ________________________________________________________________________
> > > >
> > > > James Fitness
> > > > Director
> > > > Data Scribe Australia Pty Ltd
> > > > http://www.datascribe.com.au
> > > > Computers and Supplies
> > > >
> > > > OZDAT Online
> > > > http://www.datascribe.com.au/ozdatonline/index.htm
> > > >
> > >
> > > --
> > >
> ________________________________________________________________________
> > >
> > > James Fitness
> > > Director
> > > Data Scribe Australia Pty Ltd
> > > http://www.datascribe.com.au
> > > Computers and Supplies
> > >
> > > OZDAT Online
> > > http://www.datascribe.com.au/ozdatonline/index.htm
> > >
> >
> > --
> > ________________________________________________________________________
> >
> > James Fitness
> > Director
> > Data Scribe Australia Pty Ltd
> > http://www.datascribe.com.au
> > Computers and Supplies
> >
> > OZDAT Online
> > http://www.datascribe.com.au/ozdatonline/index.htm
> >
>
> --
> ________________________________________________________________________
>
> James Fitness
> Director
> Data Scribe Australia Pty Ltd
> http://www.datascribe.com.au
> Computers and Supplies
>
> OZDAT Online
> http://www.datascribe.com.au/ozdatonline/index.htm
>
--
________________________________________________________________________
James Fitness
Director
Data Scribe Australia Pty Ltd
http://www.datascribe.com.au
Computers and Supplies
OZDAT Online
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