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The multifuel does have higher compression than the cummins.
Don't know about the injection pressures. Does that really make any difference? I could understand more volume of fuel or the injector design would make a difference but I can't see how the pressure would.
The multifuel could be called a indirect-injection engine. It's not like any I've ever seen but it does have a pre-combustion chamber built into the pistion that the injector squirts into.