Hi, that`s a tidy looking Blackstone MP you have there, they seem to be as rare as hens teeth over here in the UK, apart from the odd OP that is offered for sale these horizontal enc crank engines are rarely seen, I understand that there are many still running in Iran and other middle eastern countries.
The E4 is heavy old lump, I know through personal experience as I bought a Mirlees Blackstone ( yet another rebranding/takeover ) ES4 750 Rpm 240 Kva genset, the engine alone is 6500 Kgs and displaces 45 litres, the equivalent modern high speed engine does the same job with a third of the displacement and a sixth of the weight, unfortunately because of this many of these large ( small by marine standards) engines with all their English engineering lineage are destined to be turned into tuppence halfpenny imports but thats progress.
It would be interesting to know how one of these compares on longevity with say a Cat or Cummins on a Hp hour basis between major overhauls.
Mark.