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
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