Quote:
Originally Posted by Duffman
I think more so than in a gas engine there is an optimum intake air temperature in a diesel. Cold air is more dense and therefore has more O2 which is definately good for FE but a diesel also requires heat to run so a charge that is to cold may not run well either.
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Diesel's do not need heat to run - they need compression. The compression provides the heat. In every circumstance in diesel engines, the colder the intake air the better the efficiency.
Well, re-considering - if it is very cold the diesel needs some additional heat from the glow plugs for a few seconds, but that's a special case. It never needs warm air.