Its the Napier Nomad Mark 2

Here are some details on the Napier Nomad Mark 1

http://www.apss.org.uk/projects/smaller/nomad/

more details on its afterburning turbo (actually a turbo compound turbocharger)

http://www.apss.org.uk/projects/smaller/nomad/detail/index.htm

And finally the Napier Nomad Mark 2 as pictured above

http://en.wikipedia.org/wiki/Napier_Nomad

Its the ultimate engine IMHO

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png