Ambitious newby

[John S]

The flat fronted buses after the routemasters - the name escapes me, used the same engine design as the Chieftan tank, but that was with two opposed pistons for every cylinder.

The Leyland L60 that engine was like an hand grenade looking for a war.

main difference between small diesel two strokes and large is that in the small ones they use crankcase compression and need a fuel oil mix.
The large ones used pressure oiling like a 4 stroke but this precludes crankcase compression hence the supercharger taking over this roll.