I think what you are describing is something else entirely from a lean
condition. If the injectors had a poor spray pattern and/or the wrong
opening pressure- they could have been injecting fuel too soon (leaking)
which would cause similar problems to pre-detonation in a gasoline
motor. This never happens on a properly working diesel regardless of
air/fuel ratio, since normally the fuel is injected right at the correct
time for ignition.
A diesel with good injectors and correct injection timing will not
suffer damage due to pre-detonation regardless of how much (or how
little) fuel you supply or how much boost you run- because the fuel
doesn't enter the combustion chamber until the correct time.
Tyler
Mathieu J. Cama wrote:
Tyler,
The common denominator for all of those motors and the respective
cylinders that experienced the heat damage were defective injectors
(melted pistons and cracked/melted rings). The three motors I
personally examined after the fact had injectors on the respective
cylinders with way above spec pop-pressures and poor spray pattern.
These motors were a mix of low and higher mileage, IP timings set to
the T, and driven so that there was not really any carbon on their
valves; driven as a diesel should. Two of those motors suffered their
deaths in less than 10k miles of having injectors installed, the other
after about 20k and did not nail when hot, and just a hint at startup.
The symptoms came on hard and sudden without warning. The other one,
iirc, also had recent injector replacements. Since that fiasco, I
never install any injector without testing it first, regardless of the
maker or the seller.
i understand where you are coming from regarding too rich and high
heat, however, there is also heat that can be caused by a lean
condition that plays hand in hand with detonation. As with most things
in life, there are exceptions to the rules.
Mathieu
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