Brad,
You are right. The crank throw is so big the block is relieved to allow the
big ends to go round. The rods get close to 45 degrees from vertical at
quarter turn, hence big stresses on the cylinder walls. I dont know why,
but it isn't "undrivable" on the street although grunt down low. Power
starts at 3500. These engines have lots of bore clearance and dry sumps to
reduce friction, and lumpy cams so they sound "rattly" at low revs. They
sound awesome after 3500, and are unburstable up to 7000. Not a wide power
band really, so a five speed with a 1:1 top gear is pretty useful, with a
4.6 diff ratio to keep it on the boil in the bush.
----- Original Message -----
From: Brad HALLETT <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, 28 March 2000 22:35 PM
Subject: Re: L20 and sss heads
> What crank etc does he use?
>
> Must be an ugly stroke to rod ratio.
>
> I built one using 2L crank, 90 mm Z20e pistons (for pin height) and 1600
> rods. I made a large number of modifications to the crank and rod weight
to
> allow it to rev. Undriveable pig on the street, wild child on the dirt
and
> track, and blocks were disposeable due to stroke:bore ratio trying to push
> the pistons through the cylinder wall.
>
> Cheap build though!!!
>
> Brad HALLETT
> Ipswich, Qld
> ----- Original Message -----
> From: "Terry & Heather" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, March 28, 2000 12:31 AM
> Subject: Re: L20 and sss heads
>
>
> > Richard,
> > That's interesting that the 2.1 L engine still only costs around $12K.
> It's
> > sounds a lot i know, but pretty very good value for money for the
serious
> rally
> > types in a Datto with a good sponsor.
> >
> > Terry
> >
> > Richard Clough wrote:
> >
> > > For those interested in hi HP L series engines, you need to get in
touch
> > > with Les Collins, the original owner of Datrally Developments. Les
> still
> > > builds top HP L series engines, some of which go to Japanese
> enthusiasts.
> > > $12000 for a bullet proof reliable, "legal" L18 block, putting out a
> > > genuine 215HP using 48mm webers. However the engine capacity isn't
under
> 2
> > > litres. One of these engines is running in a 1600 rally car running
in
> > > Victorian events.
> > > Speed costs money. How fast do you want to go?
> > >
> >
> >
>
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