I would debate volumetric efficiency as the reason diesels are more efficient. Turbo diesels and new diesels with egr leave more unburned exhaust in the combustion chamber. We are talking part throttle economy here. You are talking economy at 85+% load. Of course at full load the expansion ratio. It is the expansion ratio, not the compression ratio that contributes to higher efficiency b.t.w. And yes the higher btu's per lb of fuel and the unrestricted intake tract. But again...........we are talking part load efficiency here. Take a look at any 100HP diesel on the Nebraska tests and load it to only 25-50HP. The fuel efficiency will be worse than a decent 50HP gasser in the same application.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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