10v.... interference engine?

[Pat Dooley]

Good observation.
The Audi turbo pistons are very deep dished with high sides.  This gives the
desired compression while still making for valve knockers.
Why Audi did this I'm not sure, I could only guess its maybe better
combustion or lower detonation probability.

> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of Duncan Thomson
> Sent: Thursday, February 20, 2003 12:17 AM
> To: quattro at audifans.com
> Subject: Re: 10v.... interference engine?
>
>
> > The turbo engines are all interference designs.
>
> Just curious here, assuming similar bore and stroke (turbo vs. na), I
> would have thought the turbo's lower compression ratio would have made
> interference less likely...
> So why is the low C.R. turbo interference, while the higher C.R. na is
> not...?
>
> What am I missing here...?
> cam lift? chamber shape? valve angles?
>
> what difference causes this?
>
> cheers
> Duncan
>
>