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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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