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Originally Posted by johnmyster
The whole reason why your gas engine pulls fuel is in order to cool things off in the combustion chamber and prevent precombustion that a "hot mix" could be succeptible to. Um, precombustion isn't an issue in diesels. Forget about it.
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Huh? Seems to me the reason the gas engine pulls in fuel is to burn it. Sure, there are some old designs - aircraft engines & two-cycles - that used fuel for cooling, but that's ancient.
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Plus, why would you ever want to intake warmer air on a TURBOCHARGED AND INTERCOOLED engine?
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Because it might give better fuel economy? As in maybe there's a good reason why those trucks have their air intakes located where they are?
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Maybe your computer does something funny, but the basics of Carnot/Rankine cycle dictate that a cooler charge/sink temp is more efficient at harvesting the heat energy from the source. Always.
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That's the same thinking that says an engine has to have an A/F ratio around 14:1, and can't possibly run at 21:1 or leaner?
I don't claim to be an automotive engineer. I just know what happens to the mpg display on a cool day, when the ScanGauge shows IAT around 60 degrees, and I hook up the duct that brings warm air off the cat to the intake. The mpg goes up significantly. If I said I knew for sure how or why this works, I'd be lying. I just know it does work.