Re: Wich component changes the CR in I5 turbos (Head / piston /both) ?

["frank j. bauer" <frankbauer@thevine.net>]

At 07:19 PM 11/12/99 EST, ScottyCBoy@aol.com wrote:
>In a message dated 11/12/99 4:05:45 PM Central Standard Time, 
>frankbauer@thevine.net writes:
>
><< At 01:41 PM 11/12/99 +0100, Kenn Thyrsted wrote:
> >-Is the CR controlled by the head , the pistons, both or maybe the rods ?
> 
> all of the above.
> any change that affects the volume (cylinder plus combustion chamber) at
> the top or the bottom of the stroke can affect the static compression ratio.
> 
> frank
>  >>
>
>It's the pistons the head have the same volume..

i took the question to be more hypothetical in nature.
if you increase the volume of the combustion chamber in the head it will
affect the cr in the same way that dishing the pistons will.
in the specific case of the audi i5, the difference in cr between the turbo
and na is caused by the dished piston since the head and gasket are the
same parts.

frank