Detonation 101

[Len Sabatine]

   Deck of piston appears as  a foreign object was rattling around  in that
   hole for a while. Shame we can't see the chamber and Cyl wall . Possable,
   Blackey Carbon's Head shop did  Kama Kazi  Seat and valve work , then
   seat came loose , snapped off valve head and that's all it wrote. Worse ,
   if some hardware slip'd  into the intake , etc. The damage  appears
   mechanical  tho possible ,  the hack'd  AL could have been  torch'd as
   well , IMO. Betcha it killed  lots of mosquitoes when it blew by the lube.
   No question  , the damage is rather final [ 1000 words or less ] .
   Len

>Damage this bad, might be from mechanical failure, ie some part running
>fallind lose in the engine.  Kinda hard to day with out seeing all the
>related bits.
>But, I'd venture that is was detonation,
>While the cool of the piston in general ain't too bad is you look at the
>**front** of the block you'll see where the piston is natural AL.  I'd bet
>money, that the engine detonated, lifted the head even (blew the
>headgasket), and then just started consuming itself.
>
>  http://students.washington.edu/mlui/temp/blown_engine/blown_block1.JPG
>
>Which leads to some interesting points.
>Was this a sudden failure?.
>The final last huray of the engine may have been in seconds, but something
>like trace detonation may have been eating at it for a long time.
>    Nother case of reading plugs might have saved the motor.
>EFI content is that a K/S in it's self is no guarantee.
>Bruce
>
>
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