Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Increasing engine operating temp to increase MPG

squirrl22 · 03-22-2019, 05:10 PM

It is well known that if you increase the operating temperature of an Internal combustion engine, you increase it's thermal efficiency, thereby increasing it's MPG and HP. This was demonstrated by "Smokey" Eunick with his Adiabatic Engine https://schou.dk/hvce/
I used this concept to get the most MPG from my old 1986 VW Jetta diesel (RIP- Deer strike killed it) by using a custom thermostat- would open at 230F, and Evans waterless coolant.
I have never seen this discussed on any thread, so I thought I would bring it up.
Personally, I was getting 43-46MPG on a long highway commute to and from work before my temp mod, and afterwords, I was averaging between 50-55MPG.

03-22-2019, 05:10 PM	#1 (permalink)
squirrl22 EcoModding Lurker Join Date: Nov 2011 Location: NC Posts: 24 Thanks: 0 Thanked 2 Times in 2 Posts	Increasing engine operating temp to increase MPG It is well known that if you increase the operating temperature of an Internal combustion engine, you increase it's thermal efficiency, thereby increasing it's MPG and HP. This was demonstrated by "Smokey" Eunick with his Adiabatic Engine https://schou.dk/hvce/ I used this concept to get the most MPG from my old 1986 VW Jetta diesel (RIP- Deer strike killed it) by using a custom thermostat- would open at 230F, and Evans waterless coolant. I have never seen this discussed on any thread, so I thought I would bring it up. Personally, I was getting 43-46MPG on a long highway commute to and from work before my temp mod, and afterwords, I was averaging between 50-55MPG.