Detonation 101

[den Broeder, Ernst]

I found this picture a while ago...  414 miles on a fresh 60 degree 3.4L v6 
before he put a good sized hole in piston #3.  Author of the web page 
claims "too much compression and not enough octane..."

http://www.s-series.org/htm/firestorm/stage0/detonation.jpg

Ernst




At 11:04 AM 12/12/00 -0500, you wrote:

>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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