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Gas Grade and Mileage

Originally Posted by RoshDawg Something interesting, Porsche (at least on the 991) runs temps of 210-220 for oil when in normal mode to reduce emissions and in turn (I think)

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Old 03-31-2013, 07:52 PM   #1 (permalink)
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Something interesting, Porsche (at least on the 991) runs temps of 210-220 for oil when in normal mode to reduce emissions and in turn (I think) increase gas mileage. When selecting sport, oil temp goes down to 180.

Higher oil temp apparently has something to do with emissions.
From what I have read about some of the MPG contests, higher engine temps = better MPG. Something to do with keeping the combustion gases as hot as possible while in the cylinder for maximum efficiency. IIRC, ∆T and heat loss rate were thrown in there.
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Old 03-31-2013, 09:17 PM   #2 (permalink)
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From what I have read about some of the MPG contests, higher engine temps = better MPG. Something to do with keeping the combustion gases as hot as possible while in the cylinder for maximum efficiency. IIRC, ∆T and heat loss rate were thrown in there.
Nice that makes sense. Judging from your other posts I take it you're an engineer? If so, what kind?

Oh and op, use 91 at least.
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Old 03-31-2013, 10:14 PM   #3 (permalink)
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Nice that makes sense. Judging from your other posts I take it you're an engineer? If so, what kind?

Oh and op, use 91 at least.
Not an engineer but spent many years as an Instrument Tech at a hazmat incinerator, so I know a little bit about combustion and heat. I also paid attention in Science classes when attending high school.
I also spent some time in mechanical maintenance, so have been around pumps, valves, flow, &c.
I was always asking the engineers "Why'd ya do it that way?" and most of them LOVE to splain stuff to others. heehee
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Old 04-01-2013, 01:04 AM   #4 (permalink)
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Not an engineer but spent many years as an Instrument Tech at a hazmat incinerator, so I know a little bit about combustion and heat. I also paid attention in Science classes when attending high school.
I also spent some time in mechanical maintenance, so have been around pumps, valves, flow, &c.
I was always asking the engineers "Why'd ya do it that way?" and most of them LOVE to splain stuff to others. heehee
Nice! Haha spot on!
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