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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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