On May 29, 2009, at 5:43 PM, tyler wrote:
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 too high of a pop pressure will never result in an early injection.
If anything, too little volume if any at all will be injected. A low
pop-pressure will often result in detonation (heard by nailing), and
often if left unchecked will cause the injector to stream. That will
also destroy a piston in short order.
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
Yes, timing is critical to avoiding detonation. Injection quality is
critical too. However, take 3 cylinders operating as they should, and
make the injector in the 4th have about 1/2 its required fuel and drive
the hell out of the motor and you will have damage in short order.
BTDT, seen the result.
Mathieu
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