James you can fit a half link to the chain to take up the slack.
----------
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
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