http://www.autospeed.com/A_0458/page1.html
SAAB have developed an engine like this, variable from 8:1 under load for
maximum power with supercharging mode, to 14:1 for low load extracting the
last joule from every drop of petrol mode.
They do it by tilting the head in relation to the block to vary the size of
the combustion chambers.
- Tom
----- Original Message -----
From: "Paul W. J. Stanley" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, April 28, 2001 11:36 PM
Subject: Re: compression ratio
> Adjustable compression would be desirable wouldn't it? Have some nice 10:1
> down low and then as the big turbo winds up the compression would
> automatically drop. How do the modern engines do this? Tilt the head or
> something.
> What if you found somewhere to fit another smaller piston into the
cylinder
> that slides in and out to adjust compression?
>
>
> ----- Original Message -----
> From: Errol Smith <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, April 25, 2001 5:32 PM
> Subject: RE: compression ratio
>
>
> > Mark,
> > Around 8 to 1 is about ideal in compromise between driveability and
> outright
> > grunt. Lower comp can be used to run higher boost and more power with
> higher
> > comp and less boost giving better driveability. Its really up to your
end
> > use for the engine. Get a copy of Corky Hills book "Maximum Boost" its
> worth
> > the read although not always infallible Im told.
> > ]
> > Cheers
> > Feral Errol
> > mailto:[EMAIL PROTECTED]
> > http://www.datrats.com.au/
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of mark krawczuk
> > Sent: Wednesday, April 25, 2001 3:23 PM
> > To: [EMAIL PROTECTED]
> > Subject: compression ratio
> >
> >
> > what is a decent compression ratio for a turbo motor? i have a l20b with
> > z2.4 crank and t3 turbo.
> >
> >
> > mark
> >
> >
>
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