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Old 09-27-2019, 11:54 PM   #388 (permalink)
Master EcoModder
Join Date: May 2009
Location: PDX
Posts: 1,102

Adventure Seeker - '04 Chevy Astro - Campervan
90 day: 17.3 mpg (US)

Dieselgate - '14 VW Jetta Sportwagen TDI
90 day: 38.24 mpg (US)
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Originally Posted by Bicycle Bob View Post
The main advantage of diesel is that it can run at a higher compression, and achieve higher carnot numbers.
Not having a throttle plate is not necessarily an advantage. It could also be replaced by a windmill. I'd really like to see an Eaton electric supercharger used as a generator as well. The numbers on my envelope are quite encouraging.

Production gasoline cars are running 14:1 compression ratios these days. That is getting pretty close to the 16.5:1 in my Jetta TDI. Also the higher the compression ratio the harder it is to meet emission standards. VW has been dropping the compression ratios in their diesels.
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