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I haven't been able to find numbers for the LDT. I woudl be surprised if they were much different. The 5.9 cummins is a very fair comparison as the peak torque occurs at the same speed (2000 rpm) and peak horsepower is within 100 rpm.

5.9 Cummins with VP44 0.334 BSFC minimum at 2000 RPM, for an efficiency of 41.2% 0.365 BSFC at maximum horsepower, for an efficiency of 37.7%

Found this with a quick search: 8V92: 0.345 BSFC minimum at 1700 RPM, for an efficiency of roughly 39.8%. 0.355 BSFC at rated horsepower, for an efficiency of roughly 38.7%. Series-60: 0.311 BSFC minimum at 1550 RPM, for an efficiency of roughly 44.2%. 0.315 BSFC at rated horsepower, for...

If you read the text books on engine design, the ONE factor enabling multifuel-ability is high compression ratio. There have been other multifuel engines which have neither a fuel density compensator nor the MAN combustion chamber design. That said, having really high compression ratio causes...