Yes, almost certainly a dropped valve. Many years ago I worked as an engine builder for fuel funny cars. When an engine dropped a valve, it disintegrated, sometimes blowing the cars body apart. Of course that was due to the fact that the intake manifold above the valve contained a litre or so of nitromethane pressurized at about 50 psi. When things go wrong in an internal combustion engine, bad things happen. Paul On Sep 19, 2008, at 6:15 PM, Joseph McAllister wrote:
> Seen this before. It's the result of a piston trying to ingest a valve > that has dropped down into the combustion chamber at high rpm. > > Joseph McAllister > Pentaxian > > On Sep 19, 2008, at 12:52 , "P. J. Alling" <[EMAIL PROTECTED]> > wrote: > >> Running the engine too lean will do this to aluminum pistons. >> >> Maxime Thériault wrote: >>> What's the story behind this? Do you know? It seems almost >>> impossible that a >>> gas explosion would do this. >>> >>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>> Behalf Of Mark >>> Roberts >>> >>> Charles Robinson wrote: >>> >>>> On Sep 19, 2008, at 12:43, frank theriault wrote: >>>> >>>> >>>>> On Fri, Sep 19, 2008 at 1:37 PM, Ken Waller >>>>> <[EMAIL PROTECTED]> wrote: >>>>> >>>>>> <snip> >>>>>> Funny how little they've changed over the years. >>>>>> >>>>> I was thinking the same thing. Not many other car parts would be >>>>> so >>>>> similar over that period of time, would they? >>>>> >>>>> >>>> I dunno... a piston's a piston, innit? >>>> >>> >>> http://www.robertstech.com/temp/piston.jpg > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
