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Old 12-15-2012, 03:54 PM
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cold diesel vs warmer diesel

Say in 75 degree weather (not trying to get too specific) will colder or warmer diesel fuel make more power? I realize colder air is better, but will the temp of the fuel make any difference?
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Old 12-15-2012, 04:54 PM
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From a physics stand point, cold diesel is more energy dense, just like cold air.

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Old 12-15-2012, 08:07 PM
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Cold fuel is supposed to be better, but the difference is so small I don't think you would feel a difference.
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Old 12-15-2012, 08:11 PM
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Good question Subbed cause I wanna see where this goes.
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Old 12-15-2012, 08:14 PM
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i was always under the impression that you want the coldest air possible and your fuel to be hot (not like flashpoint hot) or do i still have gasoline physics stuck in my head?
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Old 12-15-2012, 08:20 PM
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^^^ that's what I would have said too but...
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Old 12-15-2012, 10:26 PM
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I run a cool can filled with ice that chills my fuel in stainless steel line before the carb on my drag car. Figured it could be the same for diesel engines
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Old 12-16-2012, 04:53 AM
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i agree with the cool can on dragsters or any carburated engine... and if you sat down and did the math I'm sure the numbers would come out to say the denser fuel charge would equate to more horsepower, but with a diesel if the fuel is too cold it becomes sluggish and cannot complete detonation (hence the white smoke on start-up if you have a bad gp) additionally with the fuel rail flowing through the head before reaching the injectors and combustion chamber the fuel should be brought up in temperature before detonation... I don't know if a fuel cooling system would even be possible, it seems to me by the design of the engine they take a lot of precautions to ensure the fuel is at a relatively constant temp before actually reaching the combustion chamber and once the engine reaches operating temp the out side ambient air temp should have little effect on the fuel temp inside the engine...

How ever I will throw out out this one caveat, I am a Red Neck, and not an engineer... so it's entirely possible that I am way off base in my opinion...
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Old 12-16-2012, 05:31 AM
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Well starting with 6.4s, they used fuel coolers. Dmax's do too starting at a certain model.
Since this is a very high injection system, I wouldn't think it'd matter as much as a carb'd engine.

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Old 12-16-2012, 11:15 AM
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dunno maybe i'm just way out in left field but there is a fuel bowl heater + your fuel runs through the heads to get to the injectors which is cooled by antifreeze which will heat the fuel, if it was meant to be cool then why have a fuel bowl heater and run it through the heads? or is the fuel bowl heater strickly for those subzero temps?
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