Quote:
Originally Posted by rmay635703
I disagree, we already can burn LPG, CNG & gasoline efficiently in the same engine. Diesel & E85 would just be icing on the cake.
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Combining gas and diesel (spark-ignited & compression-ignited) in the same engine is very tricky. Variable compression ratio is one thing, but changing from 10:1 to 20:1 is a big challenge. Modern common rail diesels also run fuel pressures up to and above 30,000 psi. Piston shapes are much different. Cylinder heads & ports are shaped differently. Plus, these days you need aftertreatment (catalytic converters, DPF, SCR, etc.) which are completely different for gas vs diesel.
That's not to say it can't be done. I think it was Case/Farmall that made a tractor engine that started on gasoline and then switch over to diesel.