[Diy_efi] water injection

Bernd Felsche bernie
Sat Sep 29 09:15:25 UTC 2007

On Fri, 28 Sep 2007 08:06 pm, gary wrote:
> Ian, are you stating the noisy ringing of combustion due to
> excessive vibration must result in mechanical damage to be
> considered detonation?

> There are various (3 ?) levels of detonation. In a gasoline engine
> the lowest level can continue for extended periods of time without
> doing any structural mechanical damage.

It's not the machanical vibration that's the problem per se. It's
the rapid movement of gases above the piston to that strip away the
protective boundary layer, exposing the metal to the full heat of

The mechanical problems are secondary to a hole burning through the
top of the piston.

That is why e.g. "light knock" is generally OK and a good way of
getting a bit more energy from the same amount of fuel.

/"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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