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Re: Basic Diesel engine question that can't be ans
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Posted by msb on July 04, 2004 at 16:50:42 from (12.203.216.208):
In Reply to: Basic Diesel engine question that can't be answere posted by Shane on July 04, 2004 at 10:00:32:
Going to give it a whirl.First of all,I take opposition to the guy who said there is no such thing as a too lean setting on a diesel.That statement is absolutely not true.I once had a customer haul his turbocharged 4020 half way across the state so I could take a look at it.He had just had a dealer install the turbo without readjusting the fuel output of the injection pump.It was running an exhaust temperature of 1300 degrees and was still short of the power it should have had with the turbo on it.1300 degrees way above what those aluminum pistons could stand.I increased the fuel setting to where it should have been set and the exhaust temperature dropped to 1100 degress at full load on the dynomometer.Now here is the key to understanding how a diesel fuel/air mixture works.It takes a certain amount of compression to fire the fuel.Once the cylinder fires,something is going to happen.After that the fuel/air mixture can be too lean which causes excess heat or the fuel/air mixture can be too rich which causes too much heat( and excess smoke in the process.)So you are thinking just why doesn't the engine speed simply increase,right?Its the balance of air/fuel mixture that is SO important and is the difference.In the case of excess fuel (and smoke)there is simply not enough air to burn the excess fuel so it goes out the exhaust and remains unburned or only partially unburned at best.Once a diesel engine attains the speed the the govenor calls for ,the air fuel mixture becomes balanced and should produce very little smoke.If it continues to produce excessive smoke at a constant engine speed then there are other problems with the fuel system or the engine itself.I hope this very brief explanation will at least help you understand the situation,bob
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