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Originally Posted by RussG
OK I maybe talking complete junk here but I would assume smoke equals un burnt fuel. Pouring diesel in to the cylinders and NOT burning it will actually have a cooling affect.
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I'm sorry, you too are wrong. Extra unburned fuel tries to keep burning after the exhaust valve opens, leading to very high EGT and burned exhaust valves. Plus, overfueled diesels tend to melt pistons.
An unmodified naturally aspirated diesel at very high altitude might not burn valves and pistons, but on the other hand it might. Overfueled engines at sea level certainly do.
If a person were to take up residence at high altitude de-tuning the pump will lead to decreased fuel consumption and decreased EGTs, relative to leaving it alone.
Toyota's system on some of their diesels of an anaeroid ("DAC") and a throttle body to measure air flow should adequately compensate automatically for altitude.
Charlie
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Unimog U500 w/Unicat
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