Re: Combustion Chamber Size

["Thomas Washburn" <thomasw@domain.elided>]

"GIOVANNI CRESCENZI" <giovannicrescenzi@domain.elided> wrote:

> >Tom,
> >
> >Thanks for the correction on my quick and hasty reply to Lawrence.
> >
> >Henrik
> >
> >
> > > Scratch that... at BDC the total volume of the cylinder is
> > > obviously the sum of the swept volume AND combustion chamber
> > > volume!  I must be losing it...
> > >
> > >    Vswept + Vchamber
> > >    ----------------- = compression ratio
> > >        Vchamber
> > >
> > > so
> > >
> > >     490.5 + Vchamber     9
> > >    ----------------- =  ---
> > >         Vchamber         1
> > >
> > > Vchamber = 61.3125cc.
> > >
> > > -Tom
>
> The formula is correct but 1962cc is the swept volume, not the
> total volume (8.4 cm bore x 8.85 cm stroke x 4 cylinders =>
> 1962cc). Also the compression ratio is either 9.1 or 9.5, depends
> on the year according to my spec book.
> GC

The example above does assume that 1962cc is the swept volume.

As for the 9:1 compression ratio, I grabbed that figure from
Fusi's specification for a '76 Alfetta GTV 2000, just for the
purposes of example.  I don't know specifically which "2 litre" we
are talking about.

-Tom
thomasw@domain.elided

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