quattro digest, Vol 1 #4632 - 10vTurbo, interference engine

[Larry C Leung]

10VT engine dished pistons (to lower the CR) have raised sides that
turn the normally aspirated non-interference engine into an interference
engine (it seems to be against common sense, but it's interference).
BTW, even the non-interference engines can have interference should
the belt break at sufficiently high RPM. (inertia, valve overlap, it's
close
even at low RPM). Moral: Replace your belts on schedule.

LL - NY


>
> Message: 13
> From: MXHOWES at aol.com
> Date: Wed, 19 Feb 2003 17:52:00 EST
> Subject: 10v.... interference engine?
> To: quattro at audifans.com
>
> In going back thru the archives I was convinced that my 10v ('85 4kq
> & '88
> 80q) were non interference engines ... ie. you break the timing belt
> and
> nothing else is broken.  The 20 valve is a different ($) story.
> Now I see in the  Marketplace some guy is selling his '90 200tq 10v
> with a
> broken top end because of a timing belt slip. Either:
>                            a. He has a 20v and doesn't know it.
>                                                              b.
> Something
> else caused the damage
>                                                              c. He
> doesn't
> know what he is talking about or
>                                                              d.  I
> don't know
> what I am talking about
>
> Which is it?
>
> Jim
>
> --__--__--