Compression

[tberk@mindspring.com (T Berk)]

> 
> > Touching between valve and cylinder DOES NOT = PING.
> >
> > Ping (knocking) = pre detonation. This can happen in a 'non valve
> > touching if the timing belt breaks' type motor like my 8v just like a
> > 16v.
> >
> >
> > What were you thinking?  ;])
> >
> > TBerk
> >


Larry wrote:
> 
> Long as we're picking nits; no such thing as pre-detonation.  It's either
> pre-ignition or it's detonation.  Two different phenomina with pretty much
> the same results. (and neither one has any relationship with valves crashing
> into pistons)
> Larry  sandiego16V


Cathy wrote:
> And hopefully DOES thousands of times daily in my "change the timing belt
> religiously or else the valves WILL touch" TDI. Just did the belt to AVOID
> collisions. But it can knock and ping all it wants. Kinda scares me when I
> know this stuff...
> 
> You know my opinion on thongs, but with shaved legs, maybe it's in order here 
> ;) 
> 
> Cathy, knockin' and pingin' till spring...
> 



Ooops, I was thinking Detonation caused by mistimed ignition.

What was _I_ thinking?   8])

SO- knocking & pinging can be a good thing- 

TBerk
btw: carbon build up can be a source of hot spots in the cylinder. This
can cause pinging where none would other wise. The Italian Tune Up I
mentioned earlier can help to blow some of this out, as can cleaners
like Techrolene.