- Mar 16, 2012
- Reaction score
- Ram Year
- 2012, 2021
- 5.7, 6.4
I guess Toyota is making up their 38% efficiency number. https://www.greencarreports.com/new...ine-achieves-thermal-efficiency-of-38-percent
I guess Southern Illinois University is making up teaching DC machines. https://www.engr.siu.edu/staff/spezia/Web332A/Lecture Notes/Lesson 9 332ac.pdf
I guess Tesla was making it up when they told C&D Mag they went from 80% to 90% efficient. https://www.caranddriver.com/news/a...ial-media&utm_source=twitter&src=socialflowTW
I doubt they are lying, but I assume we both understand difference between general and specific. Do you think Toyota's 1.3L is the equivalent for every gasoline motor? Obviously not, and I assume you don't think it does. So while we can guess what the numbers *could* be based on general ranges, the numbers here are simply made up in regards to this specific vehicle. Correct? Or do you believe your numbers are accurate and not just a guess based on what you assume?
Perhaps of interest to the specific discussion, the article you linked to about *how* Toyota got a more efficient ICE: "Used on the 1.3-liter unit, Atkinson-cycle engines typically feature variable valve timing, allowing inlet valves to remain open as the compression stroke begins. The lower air density leads to a more efficient fuel burn and higher thermal efficiency. Typically, the engines lack power compared to conventional Otto-cycle engines--offset in hybrids by additional power from the electric motor."
So isn't the article proving *my* point that ICE working in conjunction with an EV power source can be made more efficient?
You're assuming spherical cows, meaning your oversimplifying via removing multiple variables. Gas motors lose most of their potential via heat, common knowledge, no argument...but that's not the point. We're comparing an ICE running constantly vs an ICE running *intermittently*. We're comparing an ICE that must have a wide powerband to drive a vehicle acceptably from off idle to top end rpm vs a narrow powerband that has to only be optimized for a very specific rpm range (like the Toyota engine you yourself linked to. Do you not think that will lead to a gain in efficiencies for the ICE or do you disagree with your own source now?
What parasitic loss do you assign to a traditional transmission and pumpkin set up?
What gains do you then add back in to the system for regenerative braking?
Do you see how those answers are variables that modify the numbers taken in a vacuum that you posted above?