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
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