Which straight six cylinder diesel electric engine has the largest bore?
select ?ent where { ?ent wdt:P31 wd:Q5378251 . ?ent wdt:P2556 ?obj . ?ent wdt:P1002 wd:Q1148385 } ORDER BY DESC(?obj)LIMIT 5 
english electric diesel engines: Q5378251 straight-six: Q1148385