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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: neolib who wrote (22579)	7/31/2008 2:06:34 AM
From: Maurice Winn	Read Replies (1) \| Respond to of 36921

True, diesel engines are more efficient than petrol, but not 45% in small car engines. Have a look at this serious diesel brute which runs at 50% thermal efficiency. people.bath.ac.uk But you can't squeeze that into a little two seater car. Here's thermal efficiency for diesel versus gasoline: en.wikipedia.org <Adjusting the numbers to account for the energy density of diesel fuel, one finds the overall energy efficiency of the aforementioned paragraph is still about 20% greater for the diesel version, despite the weight penalty of the diesel engine. > Comparing comparable engines, not a little one with that monster. Anyway, it's the total experience which matters, not just cherry picking line losses, increased diesel thermal efficiency etc. My point was a simple one and a correct one, which was that with crude oil at $130 a barrel, the economic pressure is towards central electricity generation and all-electric vehicles, not hybrids. Details are critical. Adding them all up correctly is vital. That's what vehicle buyers do when they pick their wheels. Mqurice