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Posted

als008.jpg

What are these and why are they different? Both kits simply label them as Allisons but there are obvious, radical differences. Are these evolutionary or are they completely different motors? The parts pack motor shows a two exhaust valve config while Miss Bud just has fat pipes. Do the fatties cover the same layout? The valve/cam/whatever covers are very different as is the delivery of the supercharge. I'd heard years ago that the PP version was Packard based but didn't they help build Allisons for the war effort?

Posted

This scan of the instruction sheet says the engine is a Packard-built Rolls-Royce Merlin. That could explain why it looks different from an Allison V-1710.

tms-vi.jpg

Posted

um, I hate it when the guy who says "read the work order, moron" is right. Now I'm wondering two things, Where did I get the impression that Miss B had an Allison and why can I never produce this fog when I need it? I guess I saw V-12 and ran with it. At least I knew that it was an aeroplane motor

Posted

I've never even seen the Bud kit... now I MUST have one!

I've got more in on the workbench under "This summer's grail get"

Posted

In WWII, the first model P-51 Mustangs, the A, B and C models, used the Allison engine. But they didn't have the power needed to perform in high altitudes. The Brits had the Merlin engine which was of the same configuration but a lot more powerful. When the US re-engined the P-51D models with that amazing Merlin, the Mustang truly came into it's own as about the best performing single engine fighter in the world!

Posted

and now I'm wondering how I could get one of those in my Miata

probably have to weld two Miatas end to end.

Not an Allison or Merlin, but still pretty wild:

Posted (edited)

Terry is correct.

While the layout might be similar to the Allison, the Rolls Royce engine was indeed more powerful and able to operate at higher altitudes. Pilots stated that the climb rate was so much better that it was immediately obvious that this was a better engine!

The name of the engine design was Merlin and they also powered Hurricanes, Spitfires and the Avro Lancaster bomber.

The Packard name was added because the engines for the Mustang were made here in the U.S. under license by the Packard automotive plant while all domestic production of autos were on a war footing.

The strange pipes are simply the maker of the Miss Bud siamese'ng two exhaust ports into one pipe since the engine had 2 exhaust valves for each cyl.

Nice pics Mike!

Edited by Jairus
Posted

Yeah, I knew all that. OK so the Merlin was better for the Mustang. Personally, if I had to hire one as a bouncer, the Allison at least looks twice as tough as the limey counterpart. I do appreciate the convenient window for checking the oil level in the Rolls. Those clever Brits

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