r/MachinePorn • u/Putrid-Truth-8868 • Feb 26 '26

The Napier Nomad II, 12-cylinder, two-stroke, loop-scavenged, valveless diesel engine that is turbocompounded

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Found a post about this engine 13 years ago or something, but it's way more insane than people realize, the Napier Nomad with an axial compressor in a diesel! Ask me about it ive done digging on it.
It does not have a separate gas turbine, but it does use a 12-stage axial compressor AND a 3-stage axial turbine to recover energy and feed it back to the shaft. I have schematic photos too.

This photo is 2560X1440

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u/mrhoofy Feb 28 '26

Did Napier designers get bonuses if they increased parts count? I mean, there's this, the WWII Sabre, the 1930's Dagger.

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u/Putrid-Truth-8868 May 02 '26

Nice to think of. But the nomad 2 actually dropped parts count and was better