Newps wrote in news:
:



wrote:


I have the cylinder from an IO-520 here that had been
detonating. The head is blown clean off the cylinder; the aluminum
fractured at the top of the cylinder threads. Things would get very
noisy, shaky, smoky and scary if that happened. Cylinder pressures go
out of sight during detonation, as do CHTs.


That sounds like preignition, not detonation. Detonation is rarly fatal
to an engine.


No, he's right about that,definitely. High BMEP's will cause the fuel to
burn so that it gives insanely high peak pressures and that will trash an
engine pretty quickly. That's the definition of detonation and it's the
quickest way to blow a hole through the top of a piston.


Bertie